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Investments - Carrying value and estimated fair value (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Schedule of Available-for-sale Securities
Amortized Cost	$ 524,829
Available-for-sale debt securities	522,943	$ 470,746
Amortized Cost	524,829	466,747
Gross Unrealized Gains	9,904	8,688
Gross Unrealized Losses	(11,790)	(4,689)
Available-for-sale securities	522,943	470,746
U.S. Government agencies
Schedule of Available-for-sale Securities
Amortized Cost	43,550	14,740
Gross Unrealized Gains	28	12
Gross Unrealized Losses	(366)	(258)
Available-for-sale debt securities	43,212	14,494
Obligations of states and political subdivisions
Schedule of Available-for-sale Securities
Amortized Cost	200,677	89,574
Gross Unrealized Gains	6,393	2,965
Gross Unrealized Losses	(1,816)	(1,428)
Available-for-sale debt securities	205,254	91,111
U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations
Schedule of Available-for-sale Securities
Amortized Cost	205,987	198,125
Gross Unrealized Gains	2,804	1,409
Gross Unrealized Losses	(6,486)	(2,815)
Available-for-sale debt securities	202,305	196,719
Private label mortgage and asset backed securities
Schedule of Available-for-sale Securities
Amortized Cost	65,615	155,308
Gross Unrealized Gains	679	4,223
Gross Unrealized Losses	(2,371)	(153)
Available-for-sale debt securities	63,923	159,378
Corporate debt securities
Schedule of Available-for-sale Securities
Amortized Cost	9,000	9,000
Gross Unrealized Gains	0	79
Gross Unrealized Losses	(751)	(35)
Available-for-sale debt securities	$ 8,249	$ 9,044

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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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