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Note 16 - Fair Values of Financial Instruments - Fair Value Hierarchy of Financial Instruments (Details) - USD ($)
Dec. 31, 2022
Dec. 31, 2021
Securities available for sale $ 602,936,000 $ 592,743,000
Mortgages Held-for-sale, Fair Value Disclosure 3,600,000 16,700,000
Servicing Asset at Fair Value, Amount, Ending Balance 17,700,000 15,400,000
Fair Value, Inputs, Level 1 [Member]    
Securities available for sale 0 0
Reported Value Measurement [Member]    
Securities available for sale [1] 602,936,000 592,743,000
Federal Home Loan Bank stock [2] 17,721,000 18,002,000
Reported Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]    
Cash and cash equivalents 96,772,000 975,160,000
Reported Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]    
Loans, net 3,874,373,000 3,418,096,000
Servicing Asset at Fair Value, Amount, Ending Balance 11,837,000 12,248,000
Reported Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]    
Mortgages Held-for-sale, Fair Value Disclosure 3,565,000 16,117,000
Accrued interest receivable 15,476,000 9,311,000
Deposits 3,712,811,000 4,083,193,000
Securities sold under agreements to repurchase 194,340,000 197,463,000
Federal Home Loan Bank advances 308,263,000 374,000,000
Accrued interest payable 3,223,000 1,393,000
Reported Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Subordinated Debentures [Member]    
Subordinated debt 48,958,000 48,244,000
Reported Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Subordinated Notes [Member]    
Subordinated debt 88,628,000 73,646,000
Reported Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member]    
Derivative Asset, Total 25,697,000 4,609,000
Interest rate swaps 25,900,000 4,857,000
Estimate of Fair Value Measurement [Member]    
Securities available for sale [1] 602,936,000 592,743,000
Federal Home Loan Bank stock [2] 17,721,000 18,002,000
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]    
Cash and cash equivalents 96,772,000 975,160,000
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]    
Loans, net 3,800,042,000 3,498,345,000
Servicing Asset at Fair Value, Amount, Ending Balance 17,727,000 15,445,000
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]    
Mortgages Held-for-sale, Fair Value Disclosure 3,643,000 16,707,000
Accrued interest receivable 15,476,000 9,311,000
Deposits 3,379,403,000 4,028,249,000
Securities sold under agreements to repurchase 194,340,000 197,463,000
Federal Home Loan Bank advances 292,044,000 384,927,000
Accrued interest payable 3,223,000 1,393,000
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Subordinated Debentures [Member]    
Subordinated debt 49,531,000 48,284,000
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Subordinated Notes [Member]    
Subordinated debt 75,024,000 73,646,000
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member]    
Derivative Asset, Total 25,697,000 4,609,000
Interest rate swaps $ 25,900,000 $ 4,857,000
[1] See Note 17 for a description of the fair value hierarchy as well as a disclosure of levels for classes of financial assets and liabilities.
[2] It is not practical to determine the fair value of FHLBI stock due to transferability restrictions; therefore, fair value is estimated at carrying amount.