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Note 15 - Fair Values of Financial Instruments - Fair Value Hierarchy of Financial Instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Securities available for sale $ 730,352 $ 617,092
Loan, Mortgage, Held-for-Sale, Fair Value Disclosure 16,000 19,000
Interest Rate Swap [Member]    
Derivative Asset 26,793 27,505
Derivative Liability 27,050 27,964
Fair Value, Inputs, Level 1 [Member]    
Securities available for sale 0 0
Reported Value Measurement [Member]    
Securities available for sale [1] 730,352 617,092
Federal Home Loan Bank stock [2] 21,513 21,513
Reported Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]    
Cash and cash equivalents 393,010 130,533
Reported Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]    
Loans, net 4,546,327 4,253,844
Reported Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]    
Loan, Mortgage, Held-for-Sale, Fair Value Disclosure 15,824 18,607
Accrued interest receivable 21,401 19,806
Deposits 4,698,366 3,900,918
Securities sold under agreements to repurchase 121,521 229,734
Federal Home Loan Bank advances 387,083 467,910
Accrued interest payable 10,201 9,012
Reported Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Subordinated Debentures [Member]    
Subordinated debt 50,330 49,644
Reported Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Subordinated Notes [Member]    
Subordinated debt 89,314 88,971
Reported Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member]    
Derivative Asset 26,793 27,505
Derivative Liability 27,050 27,964
Estimate of Fair Value Measurement [Member]    
Securities available for sale [1] 730,352 617,092
Federal Home Loan Bank stock [2] 21,513 21,513
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]    
Cash and cash equivalents 393,010 130,533
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]    
Loans, net 4,558,628 4,191,644
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]    
Loan, Mortgage, Held-for-Sale, Fair Value Disclosure 16,047 19,027
Accrued interest receivable 21,401 19,806
Deposits 4,541,896 3,814,778
Securities sold under agreements to repurchase 121,521 229,734
Federal Home Loan Bank advances 374,499 454,857
Accrued interest payable 10,201 9,012
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Subordinated Debentures [Member]    
Subordinated debt 50,336 49,653
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Subordinated Notes [Member]    
Subordinated debt 81,825 77,218
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member]    
Derivative Asset 26,793 27,505
Derivative Liability $ 27,050 $ 27,964
[1] See Note 16 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.