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

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