Federal Home Loan Bank and Federal Reserve Bank Borrowings (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Federal Home Loan Bank and Federal Reserve Bank Borrowings [Abstract]
FHLB Borrowing Capacity	$ 1,920,000	$ 2,180,000
FHLB Fixed Rate Advances, Total Amount before valuation adjustment	954,000	7,000
Federal Reserve Bank borrowing capacity	198,800	226,000
Federal Reserve Bank, Average balance during the year	$ 1,700	$ 0	$ 1,100
Paycheck Protection Program Liquidity Facility (PPPLF) borrowing rate	0.35%