Tax Credit Investments - Affordable Housing Tax Credit Investments and Other Tax Credit Investments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Components of Income Tax Expense:
Affordable housing tax credits and other tax benefits	$ 3,525	$ 5,414	$ 6,757
Other tax credit investment credits and tax benefits	9,320	8,065	10,205
Total reduction in income tax expense	12,845	13,479	16,962
Amortization Recorded in Non-Interest Expenses
Amortization of Tax Credit Investments:
Affordable housing tax credit investment losses	1,895	2,714	2,184
Affordable housing tax credit investment impairment losses	1,416	2,209	3,295
Other tax credit investment losses	811	2,234	5,668
Other tax credit investment impairment losses	6,788	6,178	9,245
Total amortization of tax credit investments recorded in non-interest expense	$ 10,910	$ 13,335	$ 20,392