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AFS Securities (Amortized cost and fair value of AFS securities, with gross unrealized gains and losses) (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 512,869 | $ 547,912
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 1,366 | 5,036
Gross Unrealized Gains | 13,096 | 4,218
AFS securities | 501,139 | 548,730
Government sponsored enterprises [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 184 | 217
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0 | 0
Gross Unrealized Gains | 4 | 1
AFS securities | 180 | 216
States and political subdivisions [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 193,195 | 204,131
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 1,328 | 4,486
Gross Unrealized Gains | 566 | 143
AFS securities | 193,957 | 208,474
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 Gains | 92 | 151
AFS securities | 3,108 | 3,049
Mortgage-backed securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 196,194 | 210,757
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 21 | 390
Gross Unrealized Gains | 8,079 | 2,350
AFS securities | 188,136 | 208,797
Collateralized mortgage obligations [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 120,096 | 129,607
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 17 | 160
Gross Unrealized Gains | 4,355 | 1,573
AFS securities | $ 115,758 | $ 128,194

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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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