Tax Credit Investments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Affordable housing tax credit investment, net	$ 162,431		$ 162,431		$ 152,203
Other tax credit investments, net	50,577		50,577		59,224
Total TCIs, net	213,008		213,008		211,427
Unfunded affordable housing tax credit commitments	47,354		47,354		31,562
Other tax credit liabilities	41,217		41,217		49,491
Total unfunded tax credit commitments and liabilities	88,571		88,571		$ 81,053
Affordable housing tax credits and other tax benefits	(6,543)	$ (7,194)	(13,031)	$ (14,388)
Other tax credit investment credits and tax benefits	(722)	(941)	(1,445)	(1,882)
Amortization of affordable housing investments, net of tax benefit	4,323	5,023	8,689	10,047
Deferred tax expense	160	208	320	416
Total net reduction in income tax expense	(2,782)	(2,904)	(5,467)	(5,807)
Affordable housing tax credits investment	1,018	1,022	2,004	2,044
Other tax credit investment amortization	545	428	1,090	856
Total amortization of TCIs	$ 1,563	$ 1,450	$ 3,094	$ 2,900