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Investment Securities - Carrying value and estimated fair value (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Schedule of Available-for-sale Securities
Debt Securities, Amortized Cost	$ 466,747	$ 470,162
Available-for-sale investment securities, Amortized cost	466,747	470,162
Available-for-sale debt securities	470,746	463,905
Available-for-sale investment securities	470,746	463,905
Available-for-sale Securities, Gross Unrealized Gains	8,688	3,214
Available-for-sale Securities, Gross Unrealized Losses	(4,689)	(9,471)
U.S. Government agencies
Schedule of Available-for-sale Securities
Debt Securities, Amortized Cost	14,740	21,723
Available-for-sale debt securities	14,494	21,321
Available-for-sale Securities, Gross Unrealized Gains	12	0
Available-for-sale Securities, Gross Unrealized Losses	(258)	(402)
Obligations of states and political subdivisions
Schedule of Available-for-sale Securities
Debt Securities, Amortized Cost	89,574	79,886
Available-for-sale debt securities	91,111	81,504
Available-for-sale Securities, Gross Unrealized Gains	2,965	2,205
Available-for-sale Securities, Gross Unrealized Losses	(1,428)	(587)
U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations
Schedule of Available-for-sale Securities
Debt Securities, Amortized Cost	198,125	239,388
Available-for-sale debt securities	196,719	234,930
Available-for-sale Securities, Gross Unrealized Gains	1,409	253
Available-for-sale Securities, Gross Unrealized Losses	(2,815)	(4,711)
Private label residential mortgage and asset backed securities
Schedule of Available-for-sale Securities
Debt Securities, Amortized Cost	155,308	129,165
Available-for-sale debt securities	159,378	126,150
Available-for-sale Securities, Gross Unrealized Gains	4,223	756
Available-for-sale Securities, Gross Unrealized Losses	(153)	$ (3,771)
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities
Debt Securities, Amortized Cost	9,000
Available-for-sale debt securities	9,044
Available-for-sale Securities, Gross Unrealized Gains	79
Available-for-sale Securities, Gross Unrealized Losses	$ (35)

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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).

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