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Note 11 - Fair Values of Financial Instruments (Tables) | 9 Months Ended
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Sep. 30, 2025
Notes Tables |
Fair Value, by Balance Sheet Grouping [Table Text Block] |
|  | Level in |  | September 30, 2025 |  |  | December 31, 2024 |
|  | Fair |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Value |  | Carrying |  |  | Fair |  |  | Carrying |  |  | Fair |
(Dollars in thousands) |  | Hierarchy |  | Values |  |  | Values |  |  | Values |  |  | Values |
Financial assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | Level 1 |  | $ | 477,019 |  |  | $ | 477,019 |  |  | $ | 393,010 |  |  | $ | 393,010 |
Securities available for sale |  | (1) |  |  | 855,138 |  |  |  | 855,138 |  |  |  | 730,352 |  |  |  | 730,352 |
FHLBI stock |  | (2) |  |  | 21,513 |  |  |  | 21,513 |  |  |  | 21,513 |  |  |  | 21,513 |
Loans, net |  | Level 3 |  |  | 4,556,031 |  |  |  | 4,622,604 |  |  |  | 4,546,327 |  |  |  | 4,558,628 |
Mortgage loans held for sale |  | Level 2 |  |  | 17,433 |  |  |  | 17,743 |  |  |  | 15,824 |  |  |  | 16,047 |
Accrued interest receivable |  | Level 2 |  |  | 22,846 |  |  |  | 22,846 |  |  |  | 21,401 |  |  |  | 21,401 |
Interest rate swaps |  | Level 2 |  |  | 25,103 |  |  |  | 25,103 |  |  |  | 26,793 |  |  |  | 26,793 |
Financial liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deposits |  | Level 2 |  |  | 4,811,813 |  |  |  | 4,665,277 |  |  |  | 4,698,366 |  |  |  | 4,541,896 |
Securities sold under agreements to repurchase |  | Level 2 |  |  | 251,499 |  |  |  | 251,499 |  |  |  | 121,521 |  |  |  | 121,521 |
FHLBI advances |  | Level 2 |  |  | 346,221 |  |  |  | 339,993 |  |  |  | 387,083 |  |  |  | 374,499 |
Subordinated debentures |  | Level 2 |  |  | 50,844 |  |  |  | 50,850 |  |  |  | 50,330 |  |  |  | 50,336 |
Subordinated notes |  | Level 2 |  |  | 89,571 |  |  |  | 85,158 |  |  |  | 89,314 |  |  |  | 81,825 |
Accrued interest payable |  | Level 2 |  |  | 10,102 |  |  |  | 10,102 |  |  |  | 10,201 |  |  |  | 10,201 |
Interest rate swaps |  | Level 2 |  |  | 25,515 |  |  |  | 25,515 |  |  |  | 27,050 |  |  |  | 27,050 |

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