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AFS Securities (Amortized cost and fair value of AFS securities, with gross unrealized gains and losses) (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 552,337 | $ 559,974
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 805 | 1,032
Gross Unrealized Losses | 35,557 | 32,858
AFS securities | 517,585 | 528,148
US Treasury Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 231,114 | 231,218
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0 | 0
Gross Unrealized Losses | 16,888 | 16,417
AFS securities | 214,226 | 214,801
States and political subdivisions [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 93,569 | 94,837
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 805 | 1,032
Gross Unrealized Losses | 3,904 | 2,993
AFS securities | 90,470 | 92,876
Auction rate money market preferred [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 3,200 | 3,200
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0 | 0
Gross Unrealized Losses | 187 | 269
AFS securities | 3,013 | 2,931
Mortgage-backed securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 33,762 | 35,321
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0 | 0
Gross Unrealized Losses | 2,718 | 2,506
AFS securities | 31,044 | 32,815
Collateralized mortgage obligations [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 182,542 | 187,248
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0 | 0
Gross Unrealized Losses | 10,711 | 9,473
AFS securities | 171,831 | 177,775
Corporate Debt Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 8,150 | 8,150
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0 | 0
Gross Unrealized Losses | 1,149 | 1,200
AFS securities | $ 7,001 | $ 6,950

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