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Investments - Carrying value and estimated fair value (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Schedule of Available-for-sale Securities
Amortized Cost	$ 615,575
Available-for-sale debt securities	631,854	$ 470,746
Amortized Cost	615,575	466,747
Gross Unrealized Gains	20,345	8,688
Gross Unrealized Losses	(4,066)	(4,689)
Available-for-sale securities	631,854	470,746
U.S. Government agencies
Schedule of Available-for-sale Securities
Amortized Cost	40,913	14,740
Gross Unrealized Gains	32	12
Gross Unrealized Losses	(317)	(258)
Available-for-sale debt securities	40,628	14,494
Obligations of states and political subdivisions
Schedule of Available-for-sale Securities
Amortized Cost	280,506	89,574
Gross Unrealized Gains	14,930	2,965
Gross Unrealized Losses	(563)	(1,428)
Available-for-sale debt securities	294,873	91,111
U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations
Schedule of Available-for-sale Securities
Amortized Cost	216,084	198,125
Gross Unrealized Gains	3,985	1,409
Gross Unrealized Losses	(2,787)	(2,815)
Available-for-sale debt securities	217,282	196,719
Private label mortgage and asset backed securities
Schedule of Available-for-sale Securities
Amortized Cost	54,072	155,308
Gross Unrealized Gains	1,253	4,223
Gross Unrealized Losses	(103)	(153)
Available-for-sale debt securities	55,222	159,378
Corporate debt securities
Schedule of Available-for-sale Securities
Amortized Cost	24,000	9,000
Gross Unrealized Gains	145	79
Gross Unrealized Losses	(296)	(35)
Available-for-sale debt securities	$ 23,849	$ 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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