| **CONSOLIDATED CONDENSED STATEMENTS OF INCOME (USD $)In Thousands, except Share data, unless otherwise specified** | 3 Months Ended                                                                                                            |
|--------------------------------------------------------------------------------------------------------------------|---------------------------------------------------------------------------------------------------------------------------|
||
| **Loans receivable:**                                                                                              |                                                                                                                      |   |
| Taxable                                                                                                            | $ 43,551frme_InterestAndFeeIncomeLoansAndLeasesTaxable                                                                    | $ 42,025frme_InterestAndFeeIncomeLoansAndLeasesTaxable |
| Tax exempt                                                                                                         | 248frme_InterestAndFeeIncomeLoansAndLeasesTaxExempt                                                                       | 61frme_InterestAndFeeIncomeLoansAndLeasesTaxExempt |
| **Investment securities:**                                                                                         |                                                                                                                      |   |
| Taxable                                                                                                            | 4,723us-gaap_InterestIncomeSecuritiesTaxable                                                                              | 4,810us-gaap_InterestIncomeSecuritiesTaxable |
| Tax exempt                                                                                                         | 3,835us-gaap_InterestIncomeSecuritiesTaxExempt                                                                            | 3,438us-gaap_InterestIncomeSecuritiesTaxExempt |
| Deposits with financial institutions                                                                               | 37us-gaap_InterestIncomeDepositsWithFinancialInstitutions                                                                 | 23us-gaap_InterestIncomeDepositsWithFinancialInstitutions |
| Federal Reserve and Federal Home Loan Bank stock                                                                   | 550frme_InterestIncomeFederalReserveAndFederalHomeLoanBankStock                                                           | 652frme_InterestIncomeFederalReserveAndFederalHomeLoanBankStock |
| Total Interest Income                                                                                              | 52,944us-gaap_InterestAndDividendIncomeOperating                                                                          | 51,009us-gaap_InterestAndDividendIncomeOperating |
| **INTEREST EXPENSE**                                                                                               |                                                                                                                      |   |
| Deposits                                                                                                           | 3,516us-gaap_InterestExpenseDeposits                                                                                      | 2,549us-gaap_InterestExpenseDeposits |
| Federal funds purchased                                                                                            | 23us-gaap_InterestExpenseFederalFundsPurchased                                                                            | 49us-gaap_InterestExpenseFederalFundsPurchased |
| Securities sold under repurchase agreements                                                                        | 78us-gaap_InterestExpenseSecuritiesSoldUnderAgreementsToRepurchase                                                        | 196us-gaap_InterestExpenseSecuritiesSoldUnderAgreementsToRepurchase |
| Federal Home Loan Bank advances                                                                                    | 691us-gaap_InterestExpenseFederalHomeLoanBankAndFederalReserveBankAdvancesLongTerm                                        | 682us-gaap_InterestExpenseFederalHomeLoanBankAndFederalReserveBankAdvancesLongTerm |
| Subordinated debentures and term loans                                                                             | 1,660us-gaap_InterestExpenseDebt                                                                                          | 1,641us-gaap_InterestExpenseDebt |
| Total Interest Expense                                                                                             | 5,968us-gaap_InterestExpense                                                                                              | 5,117us-gaap_InterestExpense |
| NET INTEREST INCOME                                                                                                | 46,976us-gaap_InterestIncomeExpenseNet                                                                                    | 45,892us-gaap_InterestIncomeExpenseNet |
| Provision for loan losses                                                                                          |                                                                                                                 |    |
| NET INTEREST INCOME AFTER PROVISION FOR LOAN LOSSES                                                                | 46,976us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss                                                              | 45,892us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss |
| **OTHER INCOME**                                                                                                   |                                                                                                                      |   |
| Service charges on deposit accounts                                                                                | 3,548us-gaap_FeesAndCommissionsDepositorAccounts                                                                          | 3,551us-gaap_FeesAndCommissionsDepositorAccounts |
| Fiduciary activities                                                                                               | 2,507us-gaap_FeesAndCommissionsFiduciaryAndTrustActivities                                                                | 2,212us-gaap_FeesAndCommissionsFiduciaryAndTrustActivities |
| Other customer fees                                                                                                | 3,667us-gaap_FeesAndCommissionsOther                                                                                      | 3,733us-gaap_FeesAndCommissionsOther |
| Commission income                                                                                                  | 2,328us-gaap_InsuranceCommissionsAndFees                                                                                  | 2,268us-gaap_InsuranceCommissionsAndFees |
| Earnings on cash surrender value of life insurance                                                                 | 747us-gaap_BankOwnedLifeInsuranceIncome                                                                                   | 748us-gaap_BankOwnedLifeInsuranceIncome |
| Net gains and fees on sales of loans                                                                               | 1,489us-gaap_GainLossOnSalesOfLoansNet                                                                                    | 723us-gaap_GainLossOnSalesOfLoansNet |
| Net realized gains on sales of available for sale securities                                                       | 1,025us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet                                                           | 581us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet |
| Other income                                                                                                       | 921us-gaap_NoninterestIncomeOtherOperatingIncome                                                                          | 1,618us-gaap_NoninterestIncomeOtherOperatingIncome |
| Total Other Income                                                                                                 | 16,232us-gaap_NoninterestIncome                                                                                           | 15,434us-gaap_NoninterestIncome |
| **OTHER EXPENSES**                                                                                                 |                                                                                                                      |   |
| Salaries and employee benefits                                                                                     | 24,541us-gaap_LaborAndRelatedExpense                                                                                      | 25,301us-gaap_LaborAndRelatedExpense |
| Net occupancy                                                                                                      | 3,790us-gaap_OccupancyNet                                                                                                 | 3,938us-gaap_OccupancyNet |
| Equipment                                                                                                          | 2,566us-gaap_EquipmentExpense                                                                                             | 2,739us-gaap_EquipmentExpense |
| Marketing                                                                                                          | 780us-gaap_MarketingExpense                                                                                               | 769us-gaap_MarketingExpense |
| Outside data processing fees                                                                                       | 1,717us-gaap_InformationTechnologyAndDataProcessing                                                                       | 1,831us-gaap_InformationTechnologyAndDataProcessing |
| Printing and office supplies                                                                                       | 364us-gaap_NoninterestExpensePrintingAndFulfillment                                                                       | 458us-gaap_NoninterestExpensePrintingAndFulfillment |
| Core deposit amortization                                                                                          | 721us-gaap_AmortizationOfIntangibleAssets                                                                                 | 592us-gaap_AmortizationOfIntangibleAssets |
| FDIC assessments                                                                                                   | 863us-gaap_FederalDepositInsuranceCorporationPremiumExpense                                                               | 1,060us-gaap_FederalDepositInsuranceCorporationPremiumExpense |
| Other real estate owned and foreclosure expenses                                                                   | 1,229us-gaap_ForeclosedRealEstateExpense                                                                                  | 1,757us-gaap_ForeclosedRealEstateExpense |
| Professional and other outside services                                                                            | 1,491us-gaap_ProfessionalAndContractServicesExpense                                                                       | 1,379us-gaap_ProfessionalAndContractServicesExpense |
| Other expenses                                                                                                     | 3,140us-gaap_OtherNoninterestExpense                                                                                      | 3,265us-gaap_OtherNoninterestExpense |
| Total Other Expenses                                                                                               | 41,202us-gaap_NoninterestExpense                                                                                          | 43,089us-gaap_NoninterestExpense |
| INCOME BEFORE INCOME TAX                                                                                           | 22,006us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 18,237us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments |
| Income tax expense                                                                                                 | 5,834us-gaap_IncomeTaxExpenseBenefit                                                                                      | 4,617us-gaap_IncomeTaxExpenseBenefit |
| NET INCOME AVAILABLE TO COMMON STOCKHOLDERS                                                                        | $ 16,172us-gaap_NetIncomeLoss                                                                                             | $ 13,620us-gaap_NetIncomeLoss |
| **Per Share Data:**                                                                                                |                                                                                                                      |   |
| Basic Net Income Available to Common Stockholders (in dollars per share)                                           | $ 0.43us-gaap_EarningsPerShareBasic                                                                                       | $ 0.38us-gaap_EarningsPerShareBasic |
| Diluted Net Income Available to Common Stockholders (in dollars per share)                                         | $ 0.43us-gaap_EarningsPerShareDiluted                                                                                     | $ 0.38us-gaap_EarningsPerShareDiluted |
| Cash Dividends Paid (in dollars per share)                                                                         | $ 0.08us-gaap_CommonStockDividendsPerShareCashPaid                                                                        | $ 0.05us-gaap_CommonStockDividendsPerShareCashPaid |
| Average Diluted Shares Outstanding (in thousands)                                                                  | 38,000,074us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding                                                         | 36,260,624us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |

| X                                                                                                                                                                                                                                                                                   |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Interest and Fee Income, Loans and Leases, Taxable
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No definition available.
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| X                                                                                                                                                                                                                                                                                        |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Interest and Fee Income, Loans and Leases, Tax Exempt
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| X                                                                                                                                                                                                                                                                                                                        |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Dividend income on Federal Home Loan Bank and Federal Reserve Bank stock.
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No definition available.
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities.
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| - Definition
Earnings on or other increases in the value of the cash surrender value of bank owned life insurance policies.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Aggregate dividends paid during the period for each share of common stock outstanding.
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.
+ References
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| - Definition
This element represents equipment expense including depreciation, repairs, rentals, and service contract costs. This item also includes equipment purchases which do not qualify for capitalization in accordance with the entity's accounting policy. This item may also include furniture expenses.
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No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of expense for Federal Deposit Insurance Corporation (FDIC) insurance.
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Includes amounts charged depositors for: (1) maintenance of their accounts (maintenance charges); (2) failure to maintain specified minimum balances on account; (3) exceeding the number of checks or transactions allowed to be processed in a given period; (4) checks drawn on no minimum balance deposit accounts; (5) withdrawals from nontransaction deposit accounts; (6) closing savings accounts before a specified minimum period of time has elapsed; (7) accounts which have remained inactive for extended periods of time or which have become dormant; (8) use of automated teller machines or remote service units; (9) checks drawn against insufficient funds that the bank assesses regardless of whether it decides to pay, return or hold the check; (10) issuing stop payment orders; (11) certifying checks; and (12) accumulating or disbursing funds deposited in IRAs or Keogh Plan accounts when not handled by the bank's trust department. This item does not include penalties assessed on the early withdrawal of time deposits.
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Income from services rendered by trust departments or by any consolidated subsidiaries acting in a fiduciary capacity, including fees earned for (1) acting as an agent for fiduciary placement and loans and (2) custody or investment advisory services when such fees are not separately billed to the customer. This item excludes commissions and fees received for the accumulation or disbursement of funds deposited to Individual Retirement or Keogh plan accounts when such are not handled by the reporting entity's trust department.
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| - Definition
Fee and commission revenue earned from sources not otherwise specified in the existing taxonomy.
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of expense recognized during the period for the foreclosure on real estate assets.
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No definition available.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The net gain (loss) resulting from a sale of loans, including adjustments to record loans classified as held-for-sale at the lower-of-cost-or-market and fair value adjustments to loan held for investment purposes.
+ References
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| - Definition
Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest.
+ References
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| - Definition
Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.
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| - Definition
The amount of expenses incurred in the period for information technology and data processing products and services.
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| - Definition
Income from agency and brokerage operations (includes sales of annuities and supplemental contracts); service charges, commissions, and fees from the sale of insurance and related services; and management fees from separate accounts, deferred annuities, and universal life products.
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| - Definition
Represents the total of interest and dividend income, including any amortization and accretion (as applicable) of discounts and premiums, earned from (1) loans and leases whether held-for-sale or held-in-portfolio; (2) investment securities; (3) federal funds sold; (4) securities purchased under agreements to resell; (5) investments in banker's acceptances, commercial paper, or certificates of deposit; (6) dividend income; or (7) other investments not otherwise specified herein.
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| - Definition
Amount of the cost of borrowed funds accounted for as interest expense.
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| - Definition
Amount of the cost of borrowed funds accounted for as interest expense for debt.
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| - Definition
Aggregate amount of interest expense on all deposits.
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| - Definition
Gross expenses on the purchase of Federal funds at a specified price with a simultaneous agreement to sell the same to the same counterparty at a fixed or determinable price at a future date.
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| - Definition
Interest expense incurred during the reporting period on long-term borrowings associated with Federal Home Loan Bank and Federal Reserve Bank advances.
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| - Definition
Gross expenses on securities sold coupled with an agreement to repurchase the same from the same counterparty at a fixed or determinable price within a fixed or variable time period.
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| - Definition
Interest income derived from funds deposited with both domestic and foreign financial institutions including funds in money market and other accounts.
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| - Definition
Amount of interest income or expense, including any amortization and accretion (as applicable) of discounts and premiums, including consideration of the provisions for loan, lease, credit, and other related losses.
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| - Definition
The net amount of operating interest income (expense).
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Amount of operating interest income, including amortization and accretion of premiums and discounts, on securities subject to state, federal and other income tax.
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| - Definition
Amount of operating interest income, including amortization and accretion of premiums and discounts, on securities exempt from state, federal and other income tax.
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| - Definition
The aggregate amount of expenditures for salaries, wages, profit sharing and incentive compensation, and other employee benefits, including equity-based compensation, and pension and other postretirement benefit expense.
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| - Definition
Expenditures for planning and executing the conception, pricing, promotion, and distribution of ideas, goods, and services. Costs of public relations and corporate promotions are typically considered to be marketing costs.
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| - Definition
The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.
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| - Definition
Total aggregate amount of all noninterest expense.
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| - Definition
Amounts expended for printing of marketing and compliance communications and fulfillment services.
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| - Definition
The total amount of noninterest income which may be derived from: (1) fees and commissions; (2) premiums earned; (3) insurance policy charges; (4) the sale or disposal of assets; and (5) other sources not otherwise specified.
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| - Definition
Represents other forms of revenue earned, excluding interest, which is not otherwise specified in the taxonomy.
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| - Definition
Amount of net occupancy expense that may include items, such as depreciation of facilities and equipment, lease expenses, property taxes and property and casualty insurance expense.
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| - Definition
Other noninterest expenses that are not separately presented in any other noninterest expense category.
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| - Definition
Professional and contract service expense includes cost reimbursements for support services related to contracted projects, outsourced management, technical and staff support.
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| - Definition
Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value.
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