Loans (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($) contract	Dec. 31, 2020 USD ($) contract	Dec. 31, 2019 USD ($) contract
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accrued Interest Receivable for Loans	$ 56,019	$ 54,831
Financing Receivable Modifications Additional Commitment To Lend	$ 1,500	$ 651
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | contract	0	0	1
Financing Receivable, Troubled Debt Restructuring, Subsequent Default			$ 26
Loan modifications, short-term deferments not classified as TDR, Number of contracts | contract	4
Loan modifications, short-term deferments not classified as TDR, net of unearned income	$ 14,100
Paycheck Protection Program (PPP) loans, net of unearned income	184,100
Loans Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged to collateralize Federal Home Loan Bank Advances	3,490,000	$ 3,460,000
Commercial Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged to collateralize Federal Reserve Bank Borrowings	200,500	200,400
Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accrued Interest Receivable for Loans	$ 32,400	$ 37,800