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Note 10 - Fair Values of Financial Instruments - Fair Value Hierarchy of Financial Instruments (Details) - USD ($)
Mar. 31, 2022
Dec. 31, 2021
Securities available for sale $ 605,661,000 $ 592,743,000
Mortgages Held-for-sale, Fair Value Disclosure 15,200,000 16,700,000
Reported Value Measurement [Member]    
Securities available for sale [1] 605,661,000 592,743,000
FHLBI stock [2] 17,721,000 18,002,000
Mortgages Held-for-sale, Fair Value Disclosure 14,746,000 16,117,000
Estimate of Fair Value Measurement [Member]    
Securities available for sale [1] 605,661,000 592,743,000
FHLBI stock [2] 17,721,000 18,002,000
Mortgages Held-for-sale, Fair Value Disclosure 15,208,000 16,707,000
Fair Value, Inputs, Level 1 [Member]    
Securities available for sale 0 0
Fair Value, Inputs, Level 1 [Member] | Reported Value Measurement [Member]    
Cash 18,898,000 17,872,000
Cash equivalents 751,306,000 957,288,000
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member]    
Cash 18,898,000 17,872,000
Cash equivalents 751,306,000 957,288,000
Fair Value, Inputs, Level 3 [Member] | Reported Value Measurement [Member]    
Loans, net 3,520,637,000 3,418,096,000
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member]    
Loans, net 3,542,217,000 3,498,345,000
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member]    
Mortgage servicing rights 12,484,000 12,248,000
Accrued interest receivable 10,655,000 9,311,000
Deposits 3,976,251,000 4,083,193,000
Repurchase agreements 204,271,000 197,463,000
FHLBI advances 382,263,000 374,000,000
Accrued interest payable 2,150,000 1,393,000
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member] | Subordinated Debentures [Member]    
Subordinated debt 48,415,000 48,244,000
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member] | Subordinated Notes [Member]    
Subordinated debt 88,428,000 73,646,000
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member] | Interest Rate Swap [Member]    
Interest rate swaps 10,053,000 4,609,000
Interest rate swaps 10,246,000 4,857,000
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member]    
Mortgage servicing rights 16,533,000 15,445,000
Accrued interest receivable 10,655,000 9,311,000
Deposits 3,795,104,000 4,028,249,000
Repurchase agreements 204,271,000 197,463,000
FHLBI advances 372,887,000 384,927,000
Accrued interest payable 2,150,000 1,393,000
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] | Subordinated Debentures [Member]    
Subordinated debt 49,990,000 48,284,000
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] | Subordinated Notes [Member]    
Subordinated debt 88,429,000 73,646,000
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] | Interest Rate Swap [Member]    
Interest rate swaps 10,053,000 4,609,000
Interest rate swaps $ 10,246,000 $ 4,857,000
[1] See Note 11 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.