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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, 2022 | Dec. 31, 2021
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 562,956 | $ 485,710
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 1,742 | 7,832
Gross Unrealized Losses | 19,779 | 2,941
AFS securities | 544,919 | 490,601
States and political subdivisions [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 114,112 | 116,836
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 1,595 | 4,457
Gross Unrealized Losses | 1,692 | 88
AFS securities | 114,015 | 121,205
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 | 42
Gross Unrealized Losses | 333 | 0
AFS securities | 2,867 | 3,242
Mortgage-backed securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 50,775 | 54,710
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 9 | 1,438
Gross Unrealized Losses | 1,206 | 0
AFS securities | 49,578 | 56,148
Collateralized mortgage obligations [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 154,794 | 90,435
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 138 | 1,876
Gross Unrealized Losses | 2,491 | 10
AFS securities | 152,441 | 92,301
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 | 19
Gross Unrealized Losses | 400 | 167
AFS securities | 7,750 | 8,002
US Treasury Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 231,925 | 212,379
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0 | 0
Gross Unrealized Losses | 13,657 | 2,676
AFS securities | $ 218,268 | $ 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 http://asc.fasb.org/extlink&oid=123581744&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 http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
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