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Investments - Carrying value and estimated fair value (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Schedule of Available-for-sale Securities
Amortized Cost	$ 533,964
Available-for-sale debt securities	544,502	$ 470,746
Amortized Cost	533,964	466,747
Gross Unrealized Gains	17,374	8,688
Gross Unrealized Losses	(6,836)	(4,689)
Available-for-sale securities	544,502	470,746
U.S. Government agencies
Schedule of Available-for-sale Securities
Amortized Cost	42,085	14,740
Gross Unrealized Gains	25	12
Gross Unrealized Losses	(404)	(258)
Available-for-sale debt securities	41,706	14,494
Obligations of states and political subdivisions
Schedule of Available-for-sale Securities
Amortized Cost	219,024	89,574
Gross Unrealized Gains	11,834	2,965
Gross Unrealized Losses	(1,003)	(1,428)
Available-for-sale debt securities	229,855	91,111
U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations
Schedule of Available-for-sale Securities
Amortized Cost	201,373	198,125
Gross Unrealized Gains	4,355	1,409
Gross Unrealized Losses	(3,891)	(2,815)
Available-for-sale debt securities	201,837	196,719
Private label mortgage and asset backed securities
Schedule of Available-for-sale Securities
Amortized Cost	52,482	155,308
Gross Unrealized Gains	1,155	4,223
Gross Unrealized Losses	(1,136)	(153)
Available-for-sale debt securities	52,501	159,378
Corporate debt securities
Schedule of Available-for-sale Securities
Amortized Cost	19,000	9,000
Gross Unrealized Gains	5	79
Gross Unrealized Losses	(402)	(35)
Available-for-sale debt securities	$ 18,603	$ 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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