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Investments - Carrying value and estimated fair value (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Apr. 01, 2022	Dec. 31, 2021
Schedule of Available-for-sale Securities
Debt securities, amortized cost	$ 790,492		$ 1,098,373
Gross Unrealized Gains	226		20,373
Gross Unrealized Losses	(80,237)		(9,538)
Available-for-sale debt securities	710,481		1,109,208
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, without Single Maturity Date	305,902		0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	27
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(21,667)	$ (25,300)
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Fair Value	284,262
U.S. Government agencies
Schedule of Available-for-sale Securities
Debt securities, amortized cost	352		373
Gross Unrealized Gains	0		6
Gross Unrealized Losses	(19)		0
Available-for-sale debt securities	333		379
U.S. Treasury securities
Schedule of Available-for-sale Securities
Debt securities, amortized cost	9,989		9,988
Gross Unrealized Gains	0		0
Gross Unrealized Losses	(1,058)		(63)
Available-for-sale debt securities	8,931		9,925
Obligations of states and political subdivisions
Schedule of Available-for-sale Securities
Debt securities, amortized cost	220,750		512,952
Gross Unrealized Gains	39		16,703
Gross Unrealized Losses	(27,360)		(3,188)
Available-for-sale debt securities	193,429		526,467
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, without Single Maturity Date	191,951
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	26
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(16,663)
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Fair Value	175,314
U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations
Schedule of Available-for-sale Securities
Debt securities, amortized cost	128,996		213,471
Gross Unrealized Gains	19		2,245
Gross Unrealized Losses	(6,563)		(1,277)
Available-for-sale debt securities	122,452		214,439
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, without Single Maturity Date	10,269
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(752)
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Fair Value	9,517
Private label mortgage and asset backed securities
Schedule of Available-for-sale Securities
Debt securities, amortized cost	430,405		317,089
Gross Unrealized Gains	168		824
Gross Unrealized Losses	(45,237)		(4,693)
Available-for-sale debt securities	385,336		313,220
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, without Single Maturity Date	57,750
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(3,319)
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Fair Value	54,431
Corporate debt securities
Schedule of Available-for-sale Securities
Debt securities, amortized cost			44,500
Gross Unrealized Gains			595
Gross Unrealized Losses			(317)
Available-for-sale debt securities			$ 44,778
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, without Single Maturity Date	45,932
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	1
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(933)
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Fair Value	$ 45,000

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