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Note 9 - Fair Value Measurements (Tables) | 3 Months Ended
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Mar. 31, 2025
Notes Tables |
Fair Value, Assets Measured on Recurring Basis [Table Text Block] |
|  | At March 31, 2025 |
|  | Fair Value |  |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  | Significant Other Observable Inputs (Level 2) |  |  | Significant Unobservable Inputs (Level 3) (1) |
|  | (In thousands) |
Debt securities available for sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agency residential MBS |  | $ | 204,342 |  |  | $ | - |  |  | $ | 204,342 |  |  | $ | - |
Agency commercial MBS |  |  | 46,502 |  |  |  | - |  |  |  | 46,502 |  |  |  | - |
Securities of U.S. Government sponsored entities |  |  | 299,722 |  |  |  | - |  |  |  | 299,722 |  |  |  | - |
Obligations of states and political subdivisions |  |  | 60,581 |  |  |  | - |  |  |  | 60,581 |  |  |  | - |
Corporate securities |  |  | 1,802,791 |  |  |  | - |  |  |  | 1,802,791 |  |  |  | - |
Collateralized loan obligations |  |  | 822,111 |  |  |  | - |  |  |  | 822,111 |  |  |  | - |
Total debt securities available for sale |  | $ | 3,236,049 |  |  | $ | - |  |  | $ | 3,236,049 |  |  | $ | - |
|  | At December 31, 2024 |
|  | Fair Value |  |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  | Significant Other Observable Inputs (Level 2) |  |  | Significant Unobservable Inputs (Level 3) (1) |
|  | (In thousands) |
Debt securities available for sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agency residential MBS |  | $ | 211,060 |  |  | $ | - |  |  | $ | 211,060 |  |  | $ | - |
Agency commercial MBS |  |  | 6,966 |  |  |  | - |  |  |  | 6,966 |  |  |  | - |
Securities of U.S. Government sponsored entities |  |  | 292,117 |  |  |  | - |  |  |  | 292,117 |  |  |  | - |
U.S. Treasury securities |  |  | 4,955 |  |  |  | 4,955 |  |  |  | - |  |  |  | - |
Obligations of states and political subdivisions |  |  | 62,186 |  |  |  | - |  |  |  | 62,186 |  |  |  | - |
Corporate securities |  |  | 1,835,937 |  |  |  | - |  |  |  | 1,835,937 |  |  |  | - |
Collateralized loan obligations |  |  | 982,589 |  |  |  | - |  |  |  | 982,589 |  |  |  | - |
Total debt securities available for sale |  | $ | 3,395,810 |  |  | $ | 4,955 |  |  | $ | 3,390,855 |  |  | $ | - |
Fair Value, by Balance Sheet Grouping [Table Text Block] |
|  | At March 31, 2025 |
|  | Carrying Amount |  |  | Estimated Fair Value |  |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  | Significant Other Observable Inputs (Level 2 ) |  |  | Significant Unobservable Inputs (Level 3 ) |
Financial Assets: |  | (In thousands) |
Cash and due from banks |  | $ | 727,336 |  |  | $ | 727,336 |  |  | $ | 727,336 |  |  | $ | - |  |  | $ | - |
Debt securities held to maturity |  |  | 839,348 |  |  |  | 813,125 |  |  |  | - |  |  |  | 813,125 |  |  |  | - |
Loans |  |  | 757,116 |  |  |  | 752,284 |  |  |  | - |  |  |  | - |  |  |  | 752,284 |
Financial Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deposits |  | $ | 4,874,095 |  |  | $ | 4,871,639 |  |  | $ | - |  |  | $ | 4,795,708 |  |  | $ | 75,931 |
Securities sold under repurchase agreements |  |  | 113,219 |  |  |  | 113,219 |  |  |  | - |  |  |  | 113,219 |  |  |  | - |
|  | At December 31, 2024 |
|  | Carrying Amount |  |  | Estimated Fair Value |  |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  | Significant Other Observable Inputs (Level 2 ) |  |  | Significant Unobservable Inputs (Level 3 ) |
Financial Assets: |  | (In thousands) |
Cash and due from banks |  | $ | 601,494 |  |  | $ | 601,494 |  |  | $ | 601,494 |  |  | $ | - |  |  | $ | - |
Debt securities held to maturity |  |  | 844,634 |  |  |  | 807,838 |  |  |  | - |  |  |  | 807,838 |  |  |  | - |
Loans |  |  | 805,520 |  |  |  | 795,849 |  |  |  | - |  |  |  | - |  |  |  | 795,849 |
Financial Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deposits |  | $ | 5,011,850 |  |  | $ | 5,007,644 |  |  | $ | - |  |  | $ | 4,929,612 |  |  | $ | 78,032 |
Securities sold under repurchase agreements |  |  | 120,322 |  |  |  | 120,322 |  |  |  | - |  |  |  | 120,322 |  |  |  | - |

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