Tax Credit Investments - Income Statement Disclosures (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Components of Income Tax Expense:
Affordable housing tax credits and other tax benefits	$ 948	$ 1,352	$ 2,744	$ 3,979
Other tax credit investment credits and tax benefits	2,702	1,727	8,130	5,567
Total reduction in income tax expense	3,650	3,079	10,874	9,546
Non-Interest Expenses
Amortization of Tax Credit Investments:
Affordable housing tax credit investment losses	681	642	1,684	1,733
Affordable housing tax credit investment impairment losses	387	585	1,159	1,668
Other tax credit investment losses	256	12	780	1,235
Other tax credit investment impairment losses	1,755	1,520	5,172	4,767
Total amortization of tax credit investments recorded in non-interest expense	$ 3,079	$ 2,759	$ 8,795	$ 9,403