Federal Home Loan Bank and Federal Reserve Bank Borrowings (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Federal Home Loan Bank and Federal Reserve Bank Borrowings [Abstract]
FHLB Borrowing Capacity	$ 2,180,000	$ 2,090,000
FHLB Fixed Rate Advances, Total Amount before valuation adjustment	7,000	7,000
Federal Reserve Bank borrowing capacity	226,000	234,400
Federal Reserve Bank, Average balance during the year	$ 0	$ 1,100	$ 99
Paycheck Protection Program Liquidity Facility (PPPLF) borrowing rate	0.35%