Affordable Housing Projects Tax Credit Partnerships - Tax Credits and Other Tax Benefits Recognized and Amortization Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Effective Yield Method
Tax credits and other tax benefits recognized	$ 11,752	$ 11,719	$ 13,572
Amortization Expense in Provision for Income Taxes	8,586	7,566	8,311
Proportional Amortization Method
Tax credits and other tax benefits recognized	6,633	3,014	1,641
Amortization Expense in Provision for Income Taxes	$ 5,729	$ 2,578	$ 1,332