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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, 2020 | Dec. 31, 2019
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Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 395,090 | $ 423,980
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 12,573 | 6,687
Gross Unrealized Losses | 474 | 828
AFS securities | 407,189 | 429,839
States and political subdivisions [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 159,267 | 165,005
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 3,849 | 4,747
Gross Unrealized Losses | 0 | 0
AFS securities | 163,116 | 169,752
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 | 0
Gross Unrealized Losses | 474 | 81
AFS securities | 2,726 | 3,119
Mortgage-backed securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 122,544 | 139,831
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 4,010 | 933
Gross Unrealized Losses | 0 | 560
AFS securities | 126,554 | 140,204
Collateralized mortgage obligations [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 110,079 | 115,944
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 4,714 | 1,007
Gross Unrealized Losses | 0 | 187
AFS securities | $ 114,793 | $ 116,764

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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=82897076&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=82897076&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=82897076&loc=d3e27161-111563 + Details
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