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Investment Securities - Carrying value and estimated fair value (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
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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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).

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