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Note 4 - Investment Securities (Tables) | 12 Months Ended
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Dec. 31, 2023
Notes Tables |
Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] |
(in thousands) |  | Amortized |  |  | Unrealized |  |  |  |
December 31, 2023 |  | cost |  |  | Gains |  |  | Losses |  |  | Fair value |
U.S. Treasury and other U.S. Government obligations |  | $ | 119,931 |  |  | $ | - |  |  | $ | (3,662 | ) |  | $ | 116,269 |
Government sponsored enterprise obligations |  |  | 104,677 |  |  |  | 157 |  |  |  | (4,987 | ) |  |  | 99,847 |
Mortgage backed securities - government agencies |  |  | 789,145 |  |  |  | 83 |  |  |  | (101,189 | ) |  |  | 688,039 |
Obligations of states and political subdivisions |  |  | 136,579 |  |  |  | 5 |  |  |  | (13,094 | ) |  |  | 123,490 |
Other |  |  | 3,821 |  |  |  | - |  |  |  | (287 | ) |  |  | 3,534 |
Total available for sale debt securities |  | $ | 1,154,153 |  |  | $ | 245 |  |  | $ | (123,219 | ) |  | $ | 1,031,179 |
December 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and other U.S. Government obligations |  | $ | 122,966 |  |  | $ | - |  |  | $ | (7,927 | ) |  | $ | 115,039 |
Government sponsored enterprise obligations |  |  | 149,773 |  |  |  | 290 |  |  |  | (6,437 | ) |  |  | 143,626 |
Mortgage backed securities - government agencies |  |  | 874,265 |  |  |  | 58 |  |  |  | (121,585 | ) |  |  | 752,738 |
Obligations of states and political subdivisions |  |  | 145,016 |  |  |  | 1 |  |  |  | (17,418 | ) |  |  | 127,599 |
Other |  |  | 5,957 |  |  |  | - |  |  |  | (342 | ) |  |  | 5,615 |
Total available for sale debt securities |  | $ | 1,297,977 |  |  | $ | 349 |  |  | $ | (153,709 | ) |  | $ | 1,144,617 |
Debt Securities, Held-to-Maturity [Table Text Block] |
(in thousands) |  | Carrying |  |  | Unrecognized |  |  |  |
December 31, 2023 |  | value |  |  | Gains |  |  | Losses |  |  | Fair value |
U.S. Treasury and other U.S. Government obligations |  | $ | 203,259 |  |  | $ | - |  |  | $ | (4,932 | ) |  | $ | 198,327 |
Government sponsored enterprise obligations |  |  | 26,918 |  |  |  | - |  |  |  | (2,457 | ) |  |  | 24,461 |
Mortgage backed securities - government agencies |  |  | 209,660 |  |  |  | 1 |  |  |  | (23,930 | ) |  |  | 185,731 |
Total held to maturity debt securities |  | $ | 439,837 |  |  | $ | 1 |  |  | $ | (31,319 | ) |  | $ | 408,519 |
December 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and other U.S. Government obligations |  | $ | 217,794 |  |  | $ | - |  |  | $ | (9,166 | ) |  | $ | 208,628 |
Government sponsored enterprise obligations |  |  | 27,507 |  |  |  | - |  |  |  | (2,559 | ) |  |  | 24,948 |
Mortgage backed securities - government agencies |  |  | 227,916 |  |  |  | - |  |  |  | (29,659 | ) |  |  | 198,257 |
Total held to maturity debt securities |  | $ | 473,217 |  |  | $ | - |  |  | $ | (41,384 | ) |  | $ | 431,833 |
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | AFS Debt Securities |  |  | HTM Debt Securities |
(in thousands) |  | Amortized cost |  |  | Fair value |  |  | Carrying value |  |  | Fair value |
Due within one year |  | $ | 128,053 |  |  | $ | 124,318 |  |  | $ | 50,069 |  |  | $ | 49,647 |
Due after one year but within five years |  |  | 36,480 |  |  |  | 34,673 |  |  |  | 153,931 |  |  |  | 149,393 |
Due after five years but within 10 years |  |  | 81,862 |  |  |  | 72,415 |  |  |  | 25,633 |  |  |  | 23,214 |
Due after 10 years |  |  | 118,613 |  |  |  | 111,734 |  |  |  | 544 |  |  |  | 534 |
Mortgage backed securities - government agencies |  |  | 789,145 |  |  |  | 688,039 |  |  |  | 209,660 |  |  |  | 185,731 |
Total |  | $ | 1,154,153 |  |  | $ | 1,031,179 |  |  | $ | 439,837 |  |  | $ | 408,519 |
Unrealized Gain (Loss) on Investments [Table Text Block] |
|  | AFS Debt Securities |
|  | Less than 12 months |  |  | 12 months or more |  |  | Total |
(in thousands) |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |
December 31, 2023 |  | value |  |  | losses |  |  | value |  |  | losses |  |  | value |  |  | losses |
U.S. Treasury and other U.S. Government obligations |  | $ | - |  |  | $ | - |  |  | $ | 116,269 |  |  | $ | (3,662 | ) |  | $ | 116,269 |  |  | $ | (3,662 | )
Government sponsored enterprise obligations |  |  | - |  |  |  | - |  |  |  | 83,675 |  |  |  | (4,987 | ) |  |  | 83,675 |  |  |  | (4,987 | )
Mortgage-backed securities - government agencies |  |  | 16,346 |  |  |  | (95 | ) |  |  | 661,195 |  |  |  | (101,094 | ) |  |  | 677,541 |  |  |  | (101,189 | )
Obligations of states and political subdivisions |  |  | 6,326 |  |  |  | (64 | ) |  |  | 105,179 |  |  |  | (13,030 | ) |  |  | 111,505 |  |  |  | (13,094 | )
Other |  |  | - |  |  |  | - |  |  |  | 3,534 |  |  |  | (287 | ) |  |  | 3,534 |  |  |  | (287 | )
Total AFS debt securities |  | $ | 22,672 |  |  | $ | (159 | ) |  | $ | 969,852 |  |  | $ | (123,060 | ) |  | $ | 992,524 |  |  | $ | (123,219 | )
December 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and other U.S. Government obligations |  | $ | 3,025 |  |  | $ | (57 | ) |  | $ | 111,966 |  |  | $ | (7,870 | ) |  | $ | 114,991 |  |  | $ | (7,927 | )
Government sponsored enterprise obligations |  |  | 99,785 |  |  |  | (3,553 | ) |  |  | 22,484 |  |  |  | (2,884 | ) |  |  | 122,269 |  |  |  | (6,437 | )
Mortgage-backed securities - government agencies |  |  | 180,263 |  |  |  | (11,114 | ) |  |  | 567,988 |  |  |  | (110,471 | ) |  |  | 748,251 |  |  |  | (121,585 | )
Obligations of states and political subdivisions |  |  | 64,165 |  |  |  | (3,763 | ) |  |  | 56,864 |  |  |  | (13,655 | ) |  |  | 121,029 |  |  |  | (17,418 | )
Other |  |  | 4,865 |  |  |  | (213 | ) |  |  | 749 |  |  |  | (129 | ) |  |  | 5,614 |  |  |  | (342 | )
Total AFS debt securities |  | $ | 352,103 |  |  | $ | (18,700 | ) |  | $ | 760,051 |  |  | $ | (135,009 | ) |  | $ | 1,112,154 |  |  | $ | (153,709 | )
|  | HTM Debt Securities |
|  | Less than 12 months |  |  | 12 months or more |  |  | Total |
(in thousands) |  | Fair |  |  | Unrecognized |  |  | Fair |  |  | Unrecognized |  |  | Fair |  |  | Unrecognized |
December 31, 2023 |  | value |  |  | losses |  |  | value |  |  | losses |  |  | value |  |  | losses |
U.S. Treasury and other U.S. Government obligations |  | $ | - |  |  | $ | - |  |  | $ | 198,327 |  |  | $ | (4,932 | ) |  | $ | 198,327 |  |  | $ | (4,932 | )
Government sponsored enterprise obligations |  |  | 455 |  |  |  | (1 | ) |  |  | 23,967 |  |  |  | (2,456 | ) |  |  | 24,422 |  |  |  | (2,457 | )
Mortgage-backed securities - government agencies |  |  | - |  |  |  | - |  |  |  | 185,504 |  |  |  | (23,930 | ) |  |  | 185,504 |  |  |  | (23,930 | )
Total HTM debt securities |  | $ | 455 |  |  | $ | (1 | ) |  | $ | 407,798 |  |  | $ | (31,318 | ) |  | $ | 408,253 |  |  | $ | (31,319 | )
December 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and other U.S. Government obligations |  | $ | 208,628 |  |  | $ | (9,166 | ) |  | $ | - |  |  | $ | - |  |  | $ | 208,628 |  |  | $ | (9,166 | )
Government sponsored enterprise obligations |  |  | 24,948 |  |  |  | (2,559 | ) |  |  | - |  |  |  | - |  |  |  | 24,948 |  |  |  | (2,559 | )
Mortgage-backed securities - government agencies |  |  | 198,257 |  |  |  | (29,659 | ) |  |  | - |  |  |  | - |  |  |  | 198,257 |  |  |  | (29,659 | )
Total HTM debt securities |  | $ | 431,833 |  |  | $ | (41,384 | ) |  | $ | - |  |  | $ | - |  |  | $ | 431,833 |  |  | $ | (41,384 | )

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