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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, 2022 | Dec. 31, 2021
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Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | $ 625,605 | $ 485,710
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 392 | 7,832
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 45,516 | 2,941
Debt Securities, Available-for-sale | 580,481 | 490,601
States and political subdivisions [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 122,023 | 116,836
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 392 | 4,457
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 4,903 | 88
Debt Securities, Available-for-sale | 117,512 | 121,205
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 | 42
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 858 | 0
Debt Securities, Available-for-sale | 2,342 | 3,242
Mortgage-backed securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 42,309 | 54,710
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0 | 1,438
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 3,239 | 0
Debt Securities, Available-for-sale | 39,070 | 56,148
Collateralized mortgage obligations [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 218,301 | 90,435
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0 | 1,876
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 12,573 | 10
Debt Securities, Available-for-sale | 205,728 | 92,301
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 | 19
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 1,022 | 167
Debt Securities, Available-for-sale | 7,128 | 8,002
US Treasury Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 231,622 | 212,379
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0 | 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 22,921 | 2,676
Debt Securities, Available-for-sale | $ 208,701 | $ 209,703

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + Details
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- Definition Amount, before tax, of unrealized loss 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + Details
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