v3.26.3
Note 11 - Fair Values of Financial Instruments - Fair Value Hierarchy of Financial Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2026
Dec. 31, 2025
Debt Securities, Available-for-Sale $ 1,098,016 $ 1,102,230
Loan, Mortgage, Held-for-Sale, Fair Value Disclosure 22,500 17,300
Interest Rate Swap [Member]    
Interest rate swaps 28,478 23,212
Interest rate swaps 28,559 23,532
Reported Value Measurement [Member]    
Debt Securities, Available-for-Sale [1] 1,098,016 1,102,230
FHLBI stock [2] 22,099 22,099
Reported Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]    
Cash and cash equivalents 628,498 473,324
Reported Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]    
Loans, net 4,896,527 4,763,697
Reported Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]    
Loan, Mortgage, Held-for-Sale, Fair Value Disclosure 22,439 17,160
Accrued interest receivable 26,548 23,638
Deposits 5,612,276 5,284,452
Securities sold under agreements to repurchase 197,453 232,291
FHLBI advances 305,322 326,221
Accrued interest payable 6,874 9,921
Reported Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Term Note [Member]    
Term note 22,500 30,000
Reported Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Subordinated Debentures [Member]    
Subordinated debt 51,529 51,015
Reported Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Subordinated Notes [Member]    
Subordinated debt 89,914 89,657
Reported Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member]    
Interest rate swaps 28,478 23,212
Interest rate swaps 28,559 23,532
Estimate of Fair Value Measurement [Member]    
Debt Securities, Available-for-Sale [1] 1,098,016 1,102,230
FHLBI stock [2] 22,099 22,099
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]    
Cash and cash equivalents 628,498 473,324
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]    
Loans, net 4,903,532 4,830,844
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]    
Loan, Mortgage, Held-for-Sale, Fair Value Disclosure 22,483 17,319
Accrued interest receivable 26,548 23,638
Deposits 4,883,878 5,024,489
Securities sold under agreements to repurchase 197,453 232,291
FHLBI advances 297,499 321,069
Accrued interest payable 6,874 9,921
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Term Note [Member]    
Term note 22,500 30,000
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Subordinated Debentures [Member]    
Subordinated debt 51,529 51,019
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Subordinated Notes [Member]    
Subordinated debt 88,741 86,826
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member]    
Interest rate swaps 28,478 23,212
Interest rate swaps $ 28,559 $ 23,532
[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.