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Investment Securities - Carrying value and estimated fair value (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Schedule of Available-for-sale Securities |  |
Debt Securities, Amortized Cost | $ 470,162 | $ 531,192
Available-for-sale investment securities, Amortized cost | 470,162 | 531,192
Available-for-sale debt securities | 463,905 | 535,281
Available-for-sale investment securities | 463,905 | 535,281
Available-for-sale Securities, Gross Unrealized Gains | 3,214 | 8,432
Available-for-sale Securities, Gross Unrealized Losses | (9,471) | (4,343)
U.S. Government agencies |  |
Schedule of Available-for-sale Securities |  |
Debt Securities, Amortized Cost | 21,723 | 65,994
Available-for-sale debt securities | 21,321 | 66,587
Available-for-sale Securities, Gross Unrealized Gains | 0 | 667
Available-for-sale Securities, Gross Unrealized Losses | (402) | (74)
Obligations of states and political subdivisions |  |
Schedule of Available-for-sale Securities |  |
Debt Securities, Amortized Cost | 79,886 | 136,955
Available-for-sale debt securities | 81,504 | 143,105
Available-for-sale Securities, Gross Unrealized Gains | 2,205 | 6,240
Available-for-sale Securities, Gross Unrealized Losses | (587) | (90)
U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations |  |
Schedule of Available-for-sale Securities |  |
Debt Securities, Amortized Cost | 239,388 | 237,210
Available-for-sale debt securities | 234,930 | 234,908
Available-for-sale Securities, Gross Unrealized Gains | 253 | 601
Available-for-sale Securities, Gross Unrealized Losses | (4,711) | (2,903)
Private label residential mortgage and asset backed securities |  |
Schedule of Available-for-sale Securities |  |
Debt Securities, Amortized Cost | 129,165 | 91,033
Available-for-sale debt securities | 126,150 | 90,681
Available-for-sale Securities, Gross Unrealized Gains | 756 | 924
Available-for-sale Securities, Gross Unrealized Losses | $ (3,771) | $ (1,276)

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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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