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Loans (Narrative) (Details) $ in Thousands | 12 Months Ended
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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 |

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