Investments - Schedule of Unrealized Loss on Investments (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Available for sale, fair value
Less than 12 Months	$ 295,514	$ 408,939
12 Months or More	252,840	143,730
Total	548,354	552,669
Available for sale, gross unrealized losses
Less than 12 Months	(11,690)	(32,893)
12 Months or More	(36,225)	(23,302)
Total	(47,915)	(56,195)
Held-to-maturity, fair value
Less than 12 Months	1,624	46,771
12 Months or More	42,868	0
Total	44,492	46,771
Held-to-maturity, gross unrealized losses
Less than 12 Months	(19)	(5,696)
12 Months or More	(3,705)	0
Total	(3,724)	(5,696)
Available-for-sale and held-to-maturity, fair value
Less than 12 Months	297,138	455,710
12 Months or More	295,708	143,730
Total	592,846	599,440
Available-for-sale and held-to-maturity, gross unrealized losses
Less than 12 Months	(11,709)	(38,589)
12 Months or More	(39,930)	(23,302)
Total	(51,639)	(61,891)
U.S. government securities
Available for sale, fair value
Less than 12 Months	19,722	28,966
12 Months or More	18,777	18,577
Total	38,499	47,543
Available for sale, gross unrealized losses
Less than 12 Months	(443)	(603)
12 Months or More	(1,021)	(1,273)
Total	(1,464)	(1,876)
Corporate securities and miscellaneous
Available for sale, fair value
Less than 12 Months	107,567	171,506
12 Months or More	98,368	34,283
Total	205,935	205,789
Available for sale, gross unrealized losses
Less than 12 Months	(4,059)	(16,063)
12 Months or More	(14,058)	(4,691)
Total	(18,117)	(20,754)
Municipal securities
Available for sale, fair value
Less than 12 Months	35,247	51,701
12 Months or More	22,752	3,689
Total	57,999	55,390
Available for sale, gross unrealized losses
Less than 12 Months	(1,764)	(7,236)
12 Months or More	(4,281)	(897)
Total	(6,045)	(8,133)
Residential mortgage-backed securities
Available for sale, fair value
Less than 12 Months	41,507	56,246
12 Months or More	65,869	52,778
Total	107,376	109,024
Available for sale, gross unrealized losses
Less than 12 Months	(1,919)	(4,152)
12 Months or More	(11,479)	(11,054)
Total	(13,398)	(15,206)
Commercial mortgage-backed securities
Available for sale, fair value
Less than 12 Months	28,658	25,836
12 Months or More	11,393	8,583
Total	40,051	34,419
Available for sale, gross unrealized losses
Less than 12 Months	(869)	(1,488)
12 Months or More	(2,360)	(2,196)
Total	(3,229)	(3,684)
Asset-backed securities
Available for sale, fair value
Less than 12 Months	62,813	74,684
12 Months or More	35,681	25,820
Total	98,494	100,504
Available for sale, gross unrealized losses
Less than 12 Months	(2,636)	(3,351)
12 Months or More	(3,026)	(3,191)
Total	(5,662)	(6,542)
Held-to-maturity, fair value
Less than 12 Months	1,624	46,771
12 Months or More	42,868	0
Total	44,492	46,771
Held-to-maturity, gross unrealized losses
Less than 12 Months	(19)	(5,696)
12 Months or More	(3,705)	0
Total	$ (3,724)	$ (5,696)