Fair Value - Level 3 Assets (Details) - Level 3 - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Roll forward of level 3 fair value measurements on a recurring basis
Beginning balance	$ 59,395	$ 30,546	$ 31,881	$ 26,224
Included in earnings	(880)	(75)	(1,772)	(253)
Included in other comprehensive income	(2,149)	(165)	(3,530)	(535)
Purchases	753	2,224	10,574	11,664
Sales	(7,781)	(5,248)	(16,911)	(7,405)
Transfers into Level 3	4,747	6,510	52,396	17,033
Transfers out of Level 3	(35,933)	(11,053)	(54,486)	(23,989)
Ending balance	18,152	22,739	18,152	22,739
Available-for-sale securities
Roll forward of level 3 fair value measurements on a recurring basis
Beginning balance	57,529	29,546	29,798	26,224
Included in earnings	(862)	(88)	(1,537)	(271)
Included in other comprehensive income	(2,149)	(165)	(3,530)	(535)
Purchases	753	2,224	10,574	10,664
Sales	(7,781)	(5,248)	(16,911)	(7,405)
Transfers into Level 3	4,747	5,417	52,396	14,850
Transfers out of Level 3	(35,933)	(11,053)	(54,486)	(22,894)
Ending balance	16,304	20,633	16,304	20,633
Corporate debt securities | Available-for-sale securities
Roll forward of level 3 fair value measurements on a recurring basis
Beginning balance	6,109	6,078	5,256	5,825
Included in earnings	(7)	7	(2)	27
Included in other comprehensive income	(28)	3	(417)	82
Purchases	753	1,995	5,687	4,253
Sales	(495)	(1,213)	(3,614)	(1,886)
Transfers into Level 3	2,899	1,129	8,673	3,678
Transfers out of Level 3	(1,956)	(1,802)	(8,308)	(5,782)
Ending balance	7,275	6,197	7,275	6,197
Collateralized debt obligations | Available-for-sale securities
Roll forward of level 3 fair value measurements on a recurring basis
Beginning balance		750		0
Included in earnings		0		0
Included in other comprehensive income		0		0
Purchases		0		750
Sales		0		0
Transfers into Level 3		0		0
Transfers out of Level 3		(750)		(750)
Ending balance		0		0
Commercial mortgage-backed securities | Available-for-sale securities
Roll forward of level 3 fair value measurements on a recurring basis
Beginning balance	8,871	17,133	15,728	19,462
Included in earnings	(188)	(90)	(892)	(287)
Included in other comprehensive income	(413)	(143)	(1,071)	(590)
Purchases	0	229	0	3,073
Sales	(660)	(2,912)	(3,825)	(3,878)
Transfers into Level 3	1,174	0	5,509	3,854
Transfers out of Level 3	(3,417)	(4,523)	(10,082)	(11,940)
Ending balance	5,367	9,694	5,367	9,694
Residential mortgage-backed securities | Available-for-sale securities
Roll forward of level 3 fair value measurements on a recurring basis
Beginning balance	42,549	3,041	8,814	937
Included in earnings	(667)	(5)	(643)	(11)
Included in other comprehensive income	(1,708)	(26)	(2,042)	(26)
Purchases	0	0	4,887	0
Sales	(6,626)	(366)	(9,472)	(842)
Transfers into Level 3	674	4,288	38,214	7,318
Transfers out of Level 3	(30,560)	(2,644)	(36,096)	(3,088)
Ending balance	3,662	4,288	3,662	4,288
Other debt securities | Available-for-sale securities
Roll forward of level 3 fair value measurements on a recurring basis
Beginning balance		2,544		0
Included in earnings		0		0
Included in other comprehensive income		1		(1)
Purchases		0		2,588
Sales		(757)		(799)
Transfers into Level 3		0		0
Transfers out of Level 3		(1,334)		(1,334)
Ending balance		454		454
Equity securities | Equity securities
Roll forward of level 3 fair value measurements on a recurring basis
Beginning balance	1,866	1,000	2,083	0
Included in earnings	(18)	13	(235)	18
Included in other comprehensive income	0	0	0	0
Purchases	0	0	0	1,000
Sales	0	0	0	0
Transfers into Level 3	0	1,093	0	2,183
Transfers out of Level 3	0	0	0	(1,095)
Ending balance	$ 1,848	$ 2,106	$ 1,848	$ 2,106