| **Loans and Allowance for Credit Losses - Recorded Investment and Unpaid Principal Balance for Impaired Loans with Associated Allowance (Detail) (USD $)In Thousands, unless otherwise specified** | 3 Months Ended                                                                                                                                                                                                             |                                                                                                                                                                                                                            |
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| **Financing Receivable, Impaired [Line Items]**                                                                                                                                                    |                                                                                                                                                                                                                       |                                                                                                                                                                                                                       |   |
| Impaired Financing Receivable, with No Related Allowance, Recorded Investment                                                                                                                      | $ 33,063us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment                                                                                                                                        |                                                                                                                                                                                                                       | $ 29,504us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment |
| Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance                                                                                                                 | 42,065us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance                                                                                                                                      |                                                                                                                                                                                                                       | 34,398us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance |
| Impaired Financing Receivable, with Related Allowance, Recorded Investment                                                                                                                         | 13,132us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment                                                                                                                                            |                                                                                                                                                                                                                       | 25,747us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment |
| Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance                                                                                                                    | 13,388us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance                                                                                                                                        |                                                                                                                                                                                                                       | 26,517us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance |
| Related allowance                                                                                                                                                                                  | 3,829us-gaap_ImpairedFinancingReceivableRelatedAllowance                                                                                                                                                                   |                                                                                                                                                                                                                       | 9,461us-gaap_ImpairedFinancingReceivableRelatedAllowance |
| Recorded investment                                                                                                                                                                                | 46,195us-gaap_ImpairedFinancingReceivableRecordedInvestment                                                                                                                                                                |                                                                                                                                                                                                                       | 55,251us-gaap_ImpairedFinancingReceivableRecordedInvestment |
| Unpaid principal balance                                                                                                                                                                           | 55,453us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance                                                                                                                                                            |                                                                                                                                                                                                                       | 60,915us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance |
| Average recorded investment                                                                                                                                                                        | 13,141us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceAverageRecordedInvestment                                                                                                                                     | 21,755us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceAverageRecordedInvestment                                                                                                                                     |   |
| Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment                                                                                                              | 37,787us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceAverageRecordedInvestment                                                                                                                                   | 32,985us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceAverageRecordedInvestment                                                                                                                                   |   |
| Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method                                                                                                          | 116us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceInterestIncomeAccrualMethod                                                                                                                                    | 112us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceInterestIncomeAccrualMethod                                                                                                                                    |   |
| Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method                                                                                                             | 32us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceInterestIncomeAccrualMethod                                                                                                                                       | 54us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceInterestIncomeAccrualMethod                                                                                                                                       |   |
| Impaired Financing Receivable, Average Recorded Investment                                                                                                                                         | 50,928us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment                                                                                                                                                         | 54,740us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment                                                                                                                                                         |   |
| Interest Income Recognized                                                                                                                                                                         | 148us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod                                                                                                                                                          | 166us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod                                                                                                                                                          |   |
| Commercial, financial, agricultural and other [Member]                                                                                                                                             |                                                                                                                                                                                                                       |                                                                                                                                                                                                                       |   |
| **Financing Receivable, Impaired [Line Items]**                                                                                                                                                    |                                                                                                                                                                                                                       |                                                                                                                                                                                                                       |   |
| Impaired Financing Receivable, with No Related Allowance, Recorded Investment                                                                                                                      | 14,650us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_CommercialLoanMember                             |                                                                                                                                                                                                                       | 9,439us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_CommercialLoanMember |
| Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance                                                                                                                 | 20,137us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_CommercialLoanMember                         |                                                                                                                                                                                                                       | 10,937us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_CommercialLoanMember |
| Impaired Financing Receivable, with Related Allowance, Recorded Investment                                                                                                                         | 10,829us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_CommercialLoanMember                               |                                                                                                                                                                                                                       | 24,826us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_CommercialLoanMember |
| Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance                                                                                                                    | 10,942us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_CommercialLoanMember                           |                                                                                                                                                                                                                       | 25,583us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_CommercialLoanMember |
| Related allowance                                                                                                                                                                                  | 3,397us-gaap_ImpairedFinancingReceivableRelatedAllowance/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_CommercialLoanMember                                                      |                                                                                                                                                                                                                       | 9,304us-gaap_ImpairedFinancingReceivableRelatedAllowance/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_CommercialLoanMember |
| Average recorded investment                                                                                                                                                                        | 10,917us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceAverageRecordedInvestment/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_CommercialLoanMember                        | 17,649us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceAverageRecordedInvestment/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_CommercialLoanMember                        |   |
| Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment                                                                                                              | 19,375us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceAverageRecordedInvestment/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_CommercialLoanMember                      | 10,953us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceAverageRecordedInvestment/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_CommercialLoanMember                      |   |
| Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method                                                                                                          | 57us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceInterestIncomeAccrualMethod/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_CommercialLoanMember                        | 17us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceInterestIncomeAccrualMethod/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_CommercialLoanMember                        |   |
| Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method                                                                                                             | 28us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceInterestIncomeAccrualMethod/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_CommercialLoanMember                          | 45us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceInterestIncomeAccrualMethod/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_CommercialLoanMember                          |   |
| Real estate construction [Member]                                                                                                                                                                  |                                                                                                                                                                                                                       |                                                                                                                                                                                                                       |   |
| **Financing Receivable, Impaired [Line Items]**                                                                                                                                                    |                                                                                                                                                                                                                       |                                                                                                                                                                                                                       |   |
| Impaired Financing Receivable, with No Related Allowance, Recorded Investment                                                                                                                      | 236us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_ConstructionLoansMember                             |                                                                                                                                                                                                                       | 236us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_ConstructionLoansMember |
| Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance                                                                                                                 | 479us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_ConstructionLoansMember                         |                                                                                                                                                                                                                       | 476us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_ConstructionLoansMember |
| Impaired Financing Receivable, with Related Allowance, Recorded Investment                                                                                                                         | 0us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_ConstructionLoansMember                                 |                                                                                                                                                                                                                       | 0us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_ConstructionLoansMember |
| Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance                                                                                                                    | 0us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_ConstructionLoansMember                             |                                                                                                                                                                                                                       | 0us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_ConstructionLoansMember |
| Related allowance                                                                                                                                                                                  | 0us-gaap_ImpairedFinancingReceivableRelatedAllowance/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_ConstructionLoansMember                                                       |                                                                                                                                                                                                                       | 0us-gaap_ImpairedFinancingReceivableRelatedAllowance/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_ConstructionLoansMember |
| Average recorded investment                                                                                                                                                                        | 0us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceAverageRecordedInvestment/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_ConstructionLoansMember                          | 638us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceAverageRecordedInvestment/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_ConstructionLoansMember                        |   |
| Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment                                                                                                              | 239us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceAverageRecordedInvestment/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_ConstructionLoansMember                      | 2,438us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceAverageRecordedInvestment/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_ConstructionLoansMember                    |   |
| Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method                                                                                                          | 0us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceInterestIncomeAccrualMethod/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_ConstructionLoansMember                      | 12us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceInterestIncomeAccrualMethod/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_ConstructionLoansMember                     |   |
| Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method                                                                                                             | 0us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceInterestIncomeAccrualMethod/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_ConstructionLoansMember                        | 0us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceInterestIncomeAccrualMethod/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_ConstructionLoansMember                        |   |
| Residential real estate [Member]                                                                                                                                                                   |                                                                                                                                                                                                                       |                                                                                                                                                                                                                       |   |
| **Financing Receivable, Impaired [Line Items]**                                                                                                                                                    |                                                                                                                                                                                                                       |                                                                                                                                                                                                                       |   |
| Impaired Financing Receivable, with No Related Allowance, Recorded Investment                                                                                                                      | 9,901us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_ResidentialPortfolioSegmentMember                 |                                                                                                                                                                                                                       | 10,773us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_ResidentialPortfolioSegmentMember |
| Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance                                                                                                                 | 11,749us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_ResidentialPortfolioSegmentMember            |                                                                                                                                                                                                                       | 12,470us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_ResidentialPortfolioSegmentMember |
| Impaired Financing Receivable, with Related Allowance, Recorded Investment                                                                                                                         | 992us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_ResidentialPortfolioSegmentMember                     |                                                                                                                                                                                                                       | 367us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_ResidentialPortfolioSegmentMember |
| Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance                                                                                                                    | 1,105us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_ResidentialPortfolioSegmentMember               |                                                                                                                                                                                                                       | 380us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_ResidentialPortfolioSegmentMember |
| Related allowance                                                                                                                                                                                  | 165us-gaap_ImpairedFinancingReceivableRelatedAllowance/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_ResidentialPortfolioSegmentMember                                           |                                                                                                                                                                                                                       | 56us-gaap_ImpairedFinancingReceivableRelatedAllowance/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_ResidentialPortfolioSegmentMember |
| Average recorded investment                                                                                                                                                                        | 901us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceAverageRecordedInvestment/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_ResidentialPortfolioSegmentMember              | 3,161us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceAverageRecordedInvestment/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_ResidentialPortfolioSegmentMember            |   |
| Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment                                                                                                              | 10,155us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceAverageRecordedInvestment/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_ResidentialPortfolioSegmentMember         | 9,825us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceAverageRecordedInvestment/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_ResidentialPortfolioSegmentMember          |   |
| Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method                                                                                                          | 38us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceInterestIncomeAccrualMethod/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_ResidentialPortfolioSegmentMember           | 49us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceInterestIncomeAccrualMethod/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_ResidentialPortfolioSegmentMember           |   |
| Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method                                                                                                             | 3us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceInterestIncomeAccrualMethod/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_ResidentialPortfolioSegmentMember              | 8us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceInterestIncomeAccrualMethod/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_ResidentialPortfolioSegmentMember              |   |
| Commercial Real Estate [Member]                                                                                                                                                                    |                                                                                                                                                                                                                       |                                                                                                                                                                                                                       |   |
| **Financing Receivable, Impaired [Line Items]**                                                                                                                                                    |                                                                                                                                                                                                                       |                                                                                                                                                                                                                       |   |
| Impaired Financing Receivable, with No Related Allowance, Recorded Investment                                                                                                                      | 7,958us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_CommercialRealEstatePortfolioSegmentMember        |                                                                                                                                                                                                                       | 8,768us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_CommercialRealEstatePortfolioSegmentMember |
| Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance                                                                                                                 | 9,317us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_CommercialRealEstatePortfolioSegmentMember    |                                                                                                                                                                                                                       | 10,178us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_CommercialRealEstatePortfolioSegmentMember |
| Impaired Financing Receivable, with Related Allowance, Recorded Investment                                                                                                                         | 1,311us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_CommercialRealEstatePortfolioSegmentMember          |                                                                                                                                                                                                                       | 554us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_CommercialRealEstatePortfolioSegmentMember |
| Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance                                                                                                                    | 1,341us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_CommercialRealEstatePortfolioSegmentMember      |                                                                                                                                                                                                                       | 554us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_CommercialRealEstatePortfolioSegmentMember |
| Related allowance                                                                                                                                                                                  | 267us-gaap_ImpairedFinancingReceivableRelatedAllowance/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_CommercialRealEstatePortfolioSegmentMember                                  |                                                                                                                                                                                                                       | 101us-gaap_ImpairedFinancingReceivableRelatedAllowance/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_CommercialRealEstatePortfolioSegmentMember |
| Average recorded investment                                                                                                                                                                        | 1,323us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceAverageRecordedInvestment/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_CommercialRealEstatePortfolioSegmentMember   | 307us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceAverageRecordedInvestment/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_CommercialRealEstatePortfolioSegmentMember     |   |
| Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment                                                                                                              | 7,711us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceAverageRecordedInvestment/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_CommercialRealEstatePortfolioSegmentMember | 9,498us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceAverageRecordedInvestment/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_CommercialRealEstatePortfolioSegmentMember |   |
| Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method                                                                                                          | 20us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceInterestIncomeAccrualMethod/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_CommercialRealEstatePortfolioSegmentMember  | 33us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceInterestIncomeAccrualMethod/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_CommercialRealEstatePortfolioSegmentMember  |   |
| Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method                                                                                                             | 1us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceInterestIncomeAccrualMethod/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_CommercialRealEstatePortfolioSegmentMember     | 1us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceInterestIncomeAccrualMethod/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_CommercialRealEstatePortfolioSegmentMember     |   |
| Loans to individuals [Member]                                                                                                                                                                      |                                                                                                                                                                                                                       |                                                                                                                                                                                                                       |   |
| **Financing Receivable, Impaired [Line Items]**                                                                                                                                                    |                                                                                                                                                                                                                       |                                                                                                                                                                                                                       |   |
| Impaired Financing Receivable, with No Related Allowance, Recorded Investment                                                                                                                      | 318us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_ConsumerLoanMember                                  |                                                                                                                                                                                                                       | 288us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_ConsumerLoanMember |
| Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance                                                                                                                 | 383us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_ConsumerLoanMember                              |                                                                                                                                                                                                                       | 337us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_ConsumerLoanMember |
| Impaired Financing Receivable, with Related Allowance, Recorded Investment                                                                                                                         | 0us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_ConsumerLoanMember                                      |                                                                                                                                                                                                                       | 0us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_ConsumerLoanMember |
| Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance                                                                                                                    | 0us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_ConsumerLoanMember                                  |                                                                                                                                                                                                                       | 0us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_ConsumerLoanMember |
| Related allowance                                                                                                                                                                                  | 0us-gaap_ImpairedFinancingReceivableRelatedAllowance/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_ConsumerLoanMember                                                            |                                                                                                                                                                                                                       | 0us-gaap_ImpairedFinancingReceivableRelatedAllowance/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_ConsumerLoanMember |
| Average recorded investment                                                                                                                                                                        | 0us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceAverageRecordedInvestment/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_ConsumerLoanMember                               | 0us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceAverageRecordedInvestment/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_ConsumerLoanMember                               |   |
| Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment                                                                                                              | 307us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceAverageRecordedInvestment/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_ConsumerLoanMember                           | 271us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceAverageRecordedInvestment/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_ConsumerLoanMember                           |   |
| Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method                                                                                                          | 1us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceInterestIncomeAccrualMethod/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_ConsumerLoanMember                           | 1us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceInterestIncomeAccrualMethod/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_ConsumerLoanMember                           |   |
| Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method                                                                                                             | $ 0us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceInterestIncomeAccrualMethod/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_ConsumerLoanMember                           | $ 0us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceInterestIncomeAccrualMethod/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_ConsumerLoanMember                           |   |

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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.
+ References
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| - Definition
Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.
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Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.
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Amount of allowance for credit losses related to recorded investment.
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| - Definition
Amount of unpaid principal balance of impaired financing receivables with related allowance for credit losses and without related allowance for credit losses.
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Amount of average investment of impaired financing receivables for which there is no related allowance for credit losses.
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| - Definition
Amount of interest income, recognized on accrual basis, on financing receivables that are recognized as impaired, for which there is no related allowance for credit losses.
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Amount of investment in impaired financing receivables for which there is no related allowance for credit losses.
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Amount of unpaid principal balance of impaired financing receivables for which there is no related allowance for credit losses.
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Amount of average investment of impaired financing receivables for which there is a related allowance for credit losses.
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Amount of interest income, recognized on accrual basis, on financing receivables, for which there is a related allowance for credit losses and are recognized as impaired.
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| - Definition
Unpaid principal balance of impaired financing receivables for which there is a related allowance for credit losses.
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