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Investments - Unrealized losses (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Schedule of Available-for-sale Securities
Less than 12 Months, Fair Value	$ 276,378	$ 105,252
Less than 12 Months, Unrealized Losses	(7,177)	(1,085)
12 Months or More, Fair Value	74,067	81,237
12 Months or More, Unrealized Losses	(715)	(1,195)
Total Fair Value	350,445	186,489
Total Unrealized Losses	(7,892)	(2,280)
Obligations of states and political subdivisions
Schedule of Available-for-sale Securities
Less than 12 Months, Fair Value	184,550	36,209
Less than 12 Months, Unrealized Losses	(5,163)	(339)
12 Months or More, Fair Value	0	0
12 Months or More, Unrealized Losses	0	0
Total Fair Value	184,550	36,209
Total Unrealized Losses	(5,163)	(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	22,132	30,755
Less than 12 Months, Unrealized Losses	(481)	(385)
12 Months or More, Fair Value	69,688	77,337
12 Months or More, Unrealized Losses	(683)	(1,095)
Total Fair Value	91,820	108,092
Total Unrealized Losses	(1,164)	(1,480)
Private label mortgage and asset backed securities
Schedule of Available-for-sale Securities
Less than 12 Months, Fair Value	56,865	25,407
Less than 12 Months, Unrealized Losses	(1,364)	(242)
12 Months or More, Fair Value	4,379	0
12 Months or More, Unrealized Losses	(32)	0
Total Fair Value	61,244	25,407
Total Unrealized Losses	(1,396)	(242)
Corporate debt securities
Schedule of Available-for-sale Securities
Less than 12 Months, Fair Value	12,831
Less than 12 Months, Unrealized Losses	(169)
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	12,831	16,781
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 169	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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