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Investments - Unrealized losses (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Schedule of Available-for-sale Securities
Less than 12 Months, Fair Value	$ 380,802	$ 105,252
Less than 12 Months, Unrealized Losses	(5,548)	(1,085)
12 Months or More, Fair Value	54,913	81,237
12 Months or More, Unrealized Losses	(624)	(1,195)
Total Fair Value	435,715	186,489
Total Unrealized Losses	(6,172)	(2,280)
Obligations of states and political subdivisions
Schedule of Available-for-sale Securities
Less than 12 Months, Fair Value	126,701	36,209
Less than 12 Months, Unrealized Losses	(2,349)	(339)
12 Months or More, Fair Value	0	0
12 Months or More, Unrealized Losses	0	0
Total Fair Value	126,701	36,209
Total Unrealized Losses	(2,349)	(339)
U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations
Schedule of Available-for-sale Securities
Less than 12 Months, Fair Value	74,656	30,755
Less than 12 Months, Unrealized Losses	(509)	(385)
12 Months or More, Fair Value	42,022	77,337
12 Months or More, Unrealized Losses	(310)	(1,095)
Total Fair Value	116,678	108,092
Total Unrealized Losses	(819)	(1,480)
Private label mortgage and asset backed securities
Schedule of Available-for-sale Securities
Less than 12 Months, Fair Value	152,197	25,407
Less than 12 Months, Unrealized Losses	(2,438)	(242)
12 Months or More, Fair Value	12,891	0
12 Months or More, Unrealized Losses	(314)	0
Total Fair Value	165,088	25,407
Total Unrealized Losses	(2,752)	(242)
Corporate debt securities
Schedule of Available-for-sale Securities
Less than 12 Months, Fair Value	27,248
Less than 12 Months, Unrealized Losses	(252)
12 Months or More, Fair Value	0
12 Months or More, Unrealized Losses	0
Other equity securities
Schedule of Available-for-sale Securities
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	27,248	16,781
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 252	219
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		12,881
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		119
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		3,900
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		$ 100

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