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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, 2020 | Dec. 31, 2019
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 325,966 | $ 423,980
Gross Unrealized Gains | 13,262 | 6,687
Gross Unrealized Losses | 0 | 828
AFS securities | 339,228 | 429,839
Debt Securities, Available-for-sale | 339,228 | 429,839
States and political subdivisions [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 137,710 | 165,005
Amortized Cost | 137,710 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 5,946 | 4,747
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 0 | 0
Debt Securities, Available-for-sale | 143,656 | 169,752
Auction rate money market preferred [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 3,200 | 3,200
Amortized Cost | 3,200 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 37 | 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 0 | 81
Debt Securities, Available-for-sale | 3,237 | 3,119
Mortgage-backed securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 85,926 | 139,831
Amortized Cost | 85,926 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 2,726 | 933
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 0 | 560
Debt Securities, Available-for-sale | 88,652 | 140,204
Collateralized mortgage obligations [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 97,430 | 115,944
Amortized Cost | 97,430 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 4,553 | 1,007
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 0 | 187
Debt Securities, Available-for-sale | 101,983 | $ 116,764
Corporate Debt Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 1,700 |
Amortized Cost | 1,700 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 0 |
Debt Securities, Available-for-sale | $ 1,700 |

X
- 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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- Definition Amortized cost of 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 -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118942338&loc=SL82898722-210454 + Details
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