| **Loans and Allowance - Summary of Troubled Debt Restructurings (Details) $ in Thousands** | 3 Months Ended |
|--------------------------------------------------------------------------------------------|----------------|
||
| **Financing Receivable, Modifications [Line Items]**                                       |           |   |
| Pre-Modification Recorded Balance                                                          | $ 90           | $ 237 |
| Post-Modification Recorded Balance                                                         | $ 90           | $ 246 |
| Number of Loans | loan                                                                     | 1              | 8 |
| Residential                                                                                |           |   |
| **Financing Receivable, Modifications [Line Items]**                                       |           |   |
| Pre-Modification Recorded Balance                                                          | $ 90           | $ 214 |
| Post-Modification Recorded Balance                                                         | $ 90           | $ 222 |
| Number of Loans | loan                                                                     | 1              | 5 |
| Home equity                                                                                |           |   |
| **Financing Receivable, Modifications [Line Items]**                                       |           |   |
| Pre-Modification Recorded Balance                                                          |           | $ 16 |
| Post-Modification Recorded Balance                                                         |           | $ 16 |
| Number of Loans | loan                                                                     |           | 2 |
| Individuals' loans for household and other personal expenditures                           |           |   |
| **Financing Receivable, Modifications [Line Items]**                                       |           |   |
| Pre-Modification Recorded Balance                                                          |           | $ 7 |
| Post-Modification Recorded Balance                                                         |           | $ 8 |
| Number of Loans | loan                                                                     |           | 1 |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                 |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of financing receivables that have been modified by troubled debt restructurings.
+ References
Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Post-modification amount of investment in financing receivables modified by troubled debt restructurings.
+ References
Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Pre-modification amount of investment in financing receivables modified by troubled debt restructurings.
+ References
Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524
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| X                                                                                                                                                                                              |
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| X                                                                                                                                                                                                |
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