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AFS Securities (Amortized cost and fair value of AFS securities, with gross unrealized gains and losses) (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | $ 559,974 | $ 625,605
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 1,032 | 392
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 32,858 | 45,516
Debt Securities, Available-for-sale | 528,148 | 580,481
US Treasury Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 231,218 | 231,622
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0 | 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 16,417 | 22,921
Debt Securities, Available-for-sale | 214,801 | 208,701
States and political subdivisions [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 94,837 | 122,023
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 1,032 | 392
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 2,993 | 4,903
Debt Securities, Available-for-sale | 92,876 | 117,512
Auction rate money market preferred [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 3,200 | 3,200
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0 | 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 269 | 858
Debt Securities, Available-for-sale | 2,931 | 2,342
Mortgage-backed securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 35,321 | 42,309
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0 | 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 2,506 | 3,239
Debt Securities, Available-for-sale | 32,815 | 39,070
Collateralized mortgage obligations [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 187,248 | 218,301
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0 | 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 9,473 | 12,573
Debt Securities, Available-for-sale | 177,775 | 205,728
Corporate Debt Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 8,150 | 8,150
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0 | 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 1,200 | 1,022
Debt Securities, Available-for-sale | $ 6,950 | $ 7,128

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 + Details
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