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AFS Securities (Amortized cost and fair value of AFS securities, with gross unrealized gains and losses) (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 466,030 | $ 501,245
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 6,297 | 2,272
Gross Unrealized Losses | 1,878 | 8,683
AFS securities | 470,449 | 494,834
Government sponsored enterprises [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 160 | 172
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0 | 0
Gross Unrealized Losses | 0 | 2
AFS securities | 160 | 170
States and political subdivisions [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 172,197 | 188,992
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 4,546 | 2,125
Gross Unrealized Losses | 1 | 251
AFS securities | 176,742 | 190,866
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 | 351 | 646
AFS securities | 2,849 | 2,554
Mortgage-backed securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 173,992 | 189,688
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 621 | 76
Gross Unrealized Losses | 1,273 | 5,280
AFS securities | 173,340 | 184,484
Collateralized mortgage obligations [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 116,481 | 119,193
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 1,130 | 71
Gross Unrealized Losses | 253 | 2,504
AFS securities | $ 117,358 | $ 116,760

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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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- Definition Amount 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 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26610-111562 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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