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Note 11 - Fair Values of Financial Instruments - Fair Value Hierarchy of Financial Instruments (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Securities available for sale $ 826,415 $ 730,352
Loan, Mortgage, Held-for-Sale, Fair Value Disclosure 28,100 16,000
Interest Rate Swap [Member]    
Interest rate swaps 25,934 26,793
Interest rate swaps 26,401 27,050
Fair Value, Inputs, Level 1 [Member]    
Securities available for sale 0 0
Reported Value Measurement [Member]    
Securities available for sale [1] 826,415 730,352
FHLBI stock [2] 21,513 21,513
Reported Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]    
Cash and cash equivalents 296,072 393,010
Reported Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]    
Loans, net 4,639,644 4,546,327
Reported Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]    
Loan, Mortgage, Held-for-Sale, Fair Value Disclosure 27,569 15,824
Accrued interest receivable 21,679 21,401
Deposits 4,710,472 4,698,366
Securities sold under agreements to repurchase 242,785 121,521
FHLBI advances 356,221 387,083
Accrued interest payable 10,208 10,201
Reported Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Subordinated Debentures [Member]    
Subordinated debt 50,672 50,330
Reported Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Subordinated Notes [Member]    
Subordinated debt 89,486 89,314
Reported Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member]    
Interest rate swaps 25,934 26,793
Interest rate swaps 26,401 27,050
Estimate of Fair Value Measurement [Member]    
Securities available for sale [1] 826,415 730,352
FHLBI stock [2] 21,513 21,513
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]    
Cash and cash equivalents 296,072 393,010
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]    
Loans, net 4,686,671 4,558,628
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]    
Loan, Mortgage, Held-for-Sale, Fair Value Disclosure 28,090 16,047
Accrued interest receivable 21,679 21,401
Deposits 4,576,047 4,541,896
Securities sold under agreements to repurchase 242,785 121,521
FHLBI advances 348,487 374,499
Accrued interest payable 10,208 10,201
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Subordinated Debentures [Member]    
Subordinated debt 50,678 50,336
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Subordinated Notes [Member]    
Subordinated debt 84,296 81,825
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member]    
Interest rate swaps 25,934 26,793
Interest rate swaps $ 26,401 $ 27,050
[1] See Note 12 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.