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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, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 357,607 | $ 325,966
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 9,898 | 13,262
Gross Unrealized Losses | 181 | 0
AFS securities | 367,324 | 339,228
States and political subdivisions [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 136,261 | 137,710
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 4,133 | 5,946
Gross Unrealized Losses | 65 | 0
AFS securities | 140,329 | 143,656
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 | 24 | 37
Gross Unrealized Losses | 0 | 0
AFS securities | 3,224 | 3,237
Mortgage-backed securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 73,687 | 85,926
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 2,148 | 2,726
Gross Unrealized Losses | 0 | 0
AFS securities | 75,835 | 88,652
Collateralized mortgage obligations [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 113,275 | 97,430
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 3,593 | 4,553
Gross Unrealized Losses | 3 | 0
AFS securities | 116,865 | 101,983
Corporate Debt Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 1,700 | 1,700
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0 | 0
Gross Unrealized Losses | 0 | 0
AFS securities | 1,700 | $ 1,700
US Treasury Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 29,484 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0 |
Gross Unrealized Losses | $ 113 |

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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=118939692&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=118939692&loc=d3e27161-111563 + Details
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