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Investment Securities - Carrying value and estimated fair value (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Schedule of Available-for-sale Securities |  |
Debt Securities, Amortized Cost | $ 538,692 | $ 548,640
Available-for-sale investment securities, Amortized cost | 538,692 | 548,640
Available-for-sale investment securities | 542,704 | 547,749
Available-for-sale Securities, Gross Unrealized Gains | 8,432 | 7,871
Available-for-sale Securities, Gross Unrealized Losses | (4,420) | (8,762)
U.S. Government agencies |  |
Schedule of Available-for-sale Securities |  |
Debt Securities, Amortized Cost | 65,994 | 69,005
Debt Securities, Estimated Fair Value | 66,587 | 68,970
Available-for-sale Securities, Gross Unrealized Gains | 667 | 242
Available-for-sale Securities, Gross Unrealized Losses | (74) | (277)
Obligations of states and political subdivisions |  |
Schedule of Available-for-sale Securities |  |
Debt Securities, Amortized Cost | 136,955 | 288,543
Debt Securities, Estimated Fair Value | 143,105 | 290,299
Available-for-sale Securities, Gross Unrealized Gains | 6,240 | 6,109
Available-for-sale Securities, Gross Unrealized Losses | (90) | (4,353)
U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations |  |
Schedule of Available-for-sale Securities |  |
Debt Securities, Amortized Cost | 237,210 | 181,785
Debt Securities, Estimated Fair Value | 234,908 | 178,221
Available-for-sale Securities, Gross Unrealized Gains | 601 | 484
Available-for-sale Securities, Gross Unrealized Losses | (2,903) | (4,048)
Private label residential mortgage and asset backed securities |  |
Schedule of Available-for-sale Securities |  |
Debt Securities, Amortized Cost | 91,033 | 1,807
Debt Securities, Estimated Fair Value | 90,681 | 2,843
Available-for-sale Securities, Gross Unrealized Gains | 924 | 1,036
Available-for-sale Securities, Gross Unrealized Losses | (1,276) | 0
Other equity securities |  |
Schedule of Available-for-sale Securities |  |
Equity Securities, Amortized Cost | 7,500 | 7,500
Equity Securities, Estimated Fair Value | 7,423 | 7,416
Available-for-sale Securities, Gross Unrealized Gains | 0 | 0
Available-for-sale Securities, Gross Unrealized Losses | $ (77) | $ (84)

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 investments in debt securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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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