Fair Value - Level 3 Assets (Details) - Level 3 - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Roll forward of level 3 fair value measurements on a recurring basis
Beginning balance	$ 23,753	$ 23,785	$ 31,881	$ 26,224
Included in earnings	(748)	(86)	(892)	(178)
Included in other comprehensive income	(151)	24	(1,381)	(370)
Purchases	5,837	5,865	9,821	9,440
Sales	(5,367)	(1,521)	(9,130)	(2,157)
Transfers into Level 3	42,640	7,001	47,649	10,523
Transfers out of Level 3	(6,569)	(4,522)	(18,553)	(12,936)
Ending balance	59,395	30,546	59,395	30,546
Available-for-sale securities
Roll forward of level 3 fair value measurements on a recurring basis
Beginning balance	21,736	22,695	29,798	26,224
Included in earnings	(597)	(91)	(675)	(183)
Included in other comprehensive income	(151)	24	(1,381)	(370)
Purchases	5,837	4,865	9,821	8,440
Sales	(5,367)	(1,521)	(9,130)	(2,157)
Transfers into Level 3	42,640	7,001	47,649	9,433
Transfers out of Level 3	(6,569)	(3,427)	(18,553)	(11,841)
Ending balance	57,529	29,546	57,529	29,546
Corporate debt securities | Available-for-sale securities
Roll forward of level 3 fair value measurements on a recurring basis
Beginning balance	10,927	5,460	5,256	5,825
Included in earnings	(8)	14	5	20
Included in other comprehensive income	(334)	37	(389)	79
Purchases	950	1,476	4,934	2,258
Sales	(2,611)	(303)	(3,119)	(673)
Transfers into Level 3	2,225	1,347	5,774	2,549
Transfers out of Level 3	(5,040)	(1,953)	(6,352)	(3,980)
Ending balance	6,109	6,078	6,109	6,078
Collateralized debt obligations | Available-for-sale securities
Roll forward of level 3 fair value measurements on a recurring basis
Beginning balance		0		0
Included in earnings		0		0
Included in other comprehensive income		0		0
Purchases		750		750
Sales		0		0
Transfers into Level 3		0		0
Transfers out of Level 3		0		0
Ending balance		750		750
Commercial mortgage-backed securities | Available-for-sale securities
Roll forward of level 3 fair value measurements on a recurring basis
Beginning balance	10,597	16,241	15,728	19,462
Included in earnings	(588)	(102)	(704)	(197)
Included in other comprehensive income	181	(10)	(658)	(447)
Purchases	0	579	0	2,844
Sales	(2,665)	(961)	(3,165)	(966)
Transfers into Level 3	2,875	2,624	4,335	3,854
Transfers out of Level 3	(1,529)	(1,238)	(6,665)	(7,417)
Ending balance	8,871	17,133	8,871	17,133
Residential mortgage-backed securities | Available-for-sale securities
Roll forward of level 3 fair value measurements on a recurring basis
Beginning balance	212	473	8,814	937
Included in earnings	(1)	(3)	24	(6)
Included in other comprehensive income	2	1	(334)	0
Purchases	4,887	0	4,887	0
Sales	(91)	(224)	(2,846)	(476)
Transfers into Level 3	37,540	3,030	37,540	3,030
Transfers out of Level 3	0	(236)	(5,536)	(444)
Ending balance	42,549	3,041	42,549	3,041
Other debt securities | Available-for-sale securities
Roll forward of level 3 fair value measurements on a recurring basis
Beginning balance		521		0
Included in earnings		0		0
Included in other comprehensive income		(4)		(2)
Purchases		2,060		2,588
Sales		(33)		(42)
Transfers into Level 3		0		0
Transfers out of Level 3		0		0
Ending balance		2,544		2,544
Equity securities | Equity securities
Roll forward of level 3 fair value measurements on a recurring basis
Beginning balance	2,017	1,090	2,083	0
Included in earnings	(151)	5	(217)	5
Included in other comprehensive income	0	0	0	0
Purchases	0	1,000	0	1,000
Sales	0	0	0	0
Transfers into Level 3	0	0	0	1,090
Transfers out of Level 3	0	(1,095)	0	(1,095)
Ending balance	$ 1,866	$ 1,000	$ 1,866	$ 1,000