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Investments - Carrying value and estimated fair value (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Schedule of Available-for-sale Securities
Amortized Cost	$ 1,045,753
Available-for-sale debt securities	1,060,362	$ 710,092
Amortized Cost	1,045,753	689,001
Gross Unrealized Gains	20,781	23,371
Gross Unrealized Losses	(6,172)	(2,280)
Available-for-sale securities	1,060,362	710,092
U.S. Government agencies
Schedule of Available-for-sale Securities
Amortized Cost	489	651
Gross Unrealized Gains	16	29
Gross Unrealized Losses	0	0
Available-for-sale debt securities	505	680
U.S. Treasury securities
Schedule of Available-for-sale Securities
Amortized Cost	9,988
Gross Unrealized Gains	22
Gross Unrealized Losses	0
Available-for-sale debt securities	10,010
Obligations of states and political subdivisions
Schedule of Available-for-sale Securities
Amortized Cost	494,425	361,734
Gross Unrealized Gains	15,844	18,170
Gross Unrealized Losses	(2,349)	(339)
Available-for-sale debt securities	507,920	379,565
U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations
Schedule of Available-for-sale Securities
Amortized Cost	226,027	214,203
Gross Unrealized Gains	2,837	3,575
Gross Unrealized Losses	(819)	(1,480)
Available-for-sale debt securities	228,045	216,298
Private label mortgage and asset backed securities
Schedule of Available-for-sale Securities
Amortized Cost	255,324	82,413
Gross Unrealized Gains	1,184	1,337
Gross Unrealized Losses	(2,752)	(242)
Available-for-sale debt securities	253,756	83,508
Corporate debt securities
Schedule of Available-for-sale Securities
Amortized Cost	59,500	30,000
Gross Unrealized Gains	878	260
Gross Unrealized Losses	(252)	(219)
Available-for-sale debt securities	$ 60,126	$ 30,041

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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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