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Loans Receivable and Allowance for Credit Losses (Narrative) (Details) - USD ($) | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 | Dec. 31, 2023 | Sep. 30, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable | $ 3,125,647,000 | $ 3,317,402,000 | $ 3,322,139,000
Financing Receivable, Nonaccrual, Interest Income | 5,000,000.0 | 1,900,000 |
Loans returned to accrual, interest income | 1,100,000 | 314,000 |
Amortized Cost Of Loans Past Due 90 Days And Still Accruing | 6,220,000 | 0 |
Business Express [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable | 98,957,000 | $ 102,928,000 | $ 101,258,000
Amortized Cost Of Loans Past Due 90 Days And Still Accruing | 387,000 |  |
Business Express [Member] | Maximum [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable | $ 250,000 |  |

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