Income Taxes TCIs and Related Unfunded Commitments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Affordable housing tax credit investments, net	$ 161,052	$ 152,203
Other tax credit investments, net	42,987	59,224
Total TCIs, net	204,039	211,427
Unfunded affordable housing tax credit commitments	49,364	31,562
Other tax credit liabilities	33,941	49,491
Total unfunded tax credit commitments and liabilities	83,305	81,053
Tax credits and benefits	(28,141)	(32,940)	$ (35,184)
Amortization of tax credits and benefits, net of tax benefits	17,378	20,429	22,184
Deferred tax expense	639	921	954
Total reduction in income tax expense	(10,124)	(11,590)	(12,046)
Total amortization of TCIs	$ 6,187	$ 6,126	$ 6,021