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AFS Securities (Amortized cost and fair value of AFS securities, with gross unrealized gains and losses) (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 567,824 | $ 625,605
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 350 | 392
Gross Unrealized Losses | 51,277 | 45,516
AFS securities | 516,897 | 580,481
States and political subdivisions [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 97,042 | 122,023
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 350 | 392
Gross Unrealized Losses | 7,619 | 4,903
AFS securities | 89,773 | 117,512
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 | 630 | 858
AFS securities | 2,570 | 2,342
Mortgage-backed securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 36,927 | 42,309
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0 | 0
Gross Unrealized Losses | 4,004 | 3,239
AFS securities | 32,923 | 39,070
Collateralized mortgage obligations [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 191,187 | 218,301
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0 | 0
Gross Unrealized Losses | 15,557 | 12,573
AFS securities | 175,630 | 205,728
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 | 1,331 | 1,022
AFS securities | 6,819 | 7,128
US Treasury Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 231,318 | 231,622
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0 | 0
Gross Unrealized Losses | 22,136 | 22,921
AFS securities | $ 209,182 | $ 208,701

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