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AFS Securities (Amortized cost and fair value of AFS securities, with gross unrealized gains and losses) (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 539,695 | $ 559,974
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 464 | 1,032
Gross Unrealized Losses | 34,513 | 32,858
AFS securities | 505,646 | 528,148
US Treasury Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 231,012 | 231,218
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0 | 0
Gross Unrealized Losses | 15,679 | 16,417
AFS securities | 215,333 | 214,801
States and political subdivisions [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 86,789 | 94,837
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 464 | 1,032
Gross Unrealized Losses | 4,202 | 2,993
AFS securities | 83,051 | 92,876
Auction Rate Securities [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 | 192 | 269
AFS securities | 3,008 | 2,931
Mortgage-backed securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 32,120 | 35,321
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0 | 0
Gross Unrealized Losses | 2,579 | 2,506
AFS securities | 29,541 | 32,815
Collateralized mortgage obligations [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 178,424 | 187,248
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0 | 0
Gross Unrealized Losses | 10,715 | 9,473
AFS securities | 167,709 | 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 | 1,146 | 1,200
AFS securities | $ 7,004 | $ 6,950

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