Loans (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($) contract	Dec. 31, 2021 USD ($) contract	Dec. 31, 2020 contract
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accrued Interest Receivable for Loans	$ 64,908	$ 56,019
Financing Receivable Modifications Additional Commitment To Lend	$ 123	$ 1,500
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | contract	0	0	0
Loans Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged to collateralize Federal Home Loan Bank Advances	$ 4,360,000	$ 3,490,000
Commercial Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged to collateralize Federal Reserve Bank Borrowings	301,400	200,500
Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accrued Interest Receivable for Loans	$ 43,400	$ 32,400