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Note 10 - Fair Values of Financial Instruments - Fair Value Hierarchy of Financial Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Securities available for sale $ 703,375 $ 617,092
Loan, Mortgage, Held-for-Sale, Fair Value Disclosure 29,700 19,000
Interest Rate Swap [Member]    
Interest rate swaps 29,646 27,505
Interest rate swaps 30,255 27,964
Fair Value, Inputs, Level 1 [Member]    
Securities available for sale 0 0
Reported Value Measurement [Member]    
Securities available for sale [1] 703,375 617,092
FHLBI stock [2] 21,513 21,513
Reported Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]    
Cash and cash equivalents 328,546 130,533
Reported Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]    
Loans, net 4,496,428 4,253,844
Reported Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]    
Loan, Mortgage, Held-for-Sale, Fair Value Disclosure 29,260 18,607
Accrued interest receivable 22,414 19,806
Deposits 4,455,898 3,900,918
Securities sold under agreements to repurchase 220,936 229,734
FHLBI advances 417,083 467,910
Accrued interest payable 10,267 9,012
Reported Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Subordinated Debentures [Member]    
Subordinated debt 50,158 49,644
Reported Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Subordinated Notes [Member]    
Subordinated debt 89,228 88,971
Reported Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member]    
Interest rate swaps 29,646 27,505
Interest rate swaps 30,255 27,964
Estimate of Fair Value Measurement [Member]    
Securities available for sale [1] 703,375 617,092
FHLBI stock [2] 21,513 21,513
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]    
Cash and cash equivalents 328,546 130,533
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]    
Loans, net 4,553,183 4,191,644
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]    
Loan, Mortgage, Held-for-Sale, Fair Value Disclosure 29,713 19,027
Accrued interest receivable 22,414 19,806
Deposits 4,377,403 3,814,778
Securities sold under agreements to repurchase 220,936 229,734
FHLBI advances 410,057 454,857
Accrued interest payable 10,267 9,012
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Subordinated Debentures [Member]    
Subordinated debt 50,165 49,653
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Subordinated Notes [Member]    
Subordinated debt 80,925 77,218
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member]    
Interest rate swaps 29,646 27,505
Interest rate swaps $ 30,255 $ 27,964
[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.