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Investments - Carrying value and estimated fair value (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Schedule of Available-for-sale Securities
Amortized Cost	$ 761,249
Available-for-sale debt securities	768,719	$ 710,092
Amortized Cost	761,249	689,001
Gross Unrealized Gains	15,362	23,371
Gross Unrealized Losses	(7,892)	(2,280)
Available-for-sale securities	768,719	710,092
U.S. Government agencies
Schedule of Available-for-sale Securities
Amortized Cost	644	651
Gross Unrealized Gains	11	29
Gross Unrealized Losses	0	0
Available-for-sale debt securities	655	680
Obligations of states and political subdivisions
Schedule of Available-for-sale Securities
Amortized Cost	408,188	361,734
Gross Unrealized Gains	10,458	18,170
Gross Unrealized Losses	(5,163)	(339)
Available-for-sale debt securities	413,483	379,565
U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations
Schedule of Available-for-sale Securities
Amortized Cost	212,364	214,203
Gross Unrealized Gains	3,186	3,575
Gross Unrealized Losses	(1,164)	(1,480)
Available-for-sale debt securities	214,386	216,298
Private label mortgage and asset backed securities
Schedule of Available-for-sale Securities
Amortized Cost	108,053	82,413
Gross Unrealized Gains	1,263	1,337
Gross Unrealized Losses	(1,396)	(242)
Available-for-sale debt securities	107,920	83,508
Corporate debt securities
Schedule of Available-for-sale Securities
Amortized Cost	32,000	30,000
Gross Unrealized Gains	444	260
Gross Unrealized Losses	(169)	(219)
Available-for-sale debt securities	$ 32,275	$ 30,041

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