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Loans Receivable and Allowance for Credit Losses (Narrative) (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable | $ 3,265,145,000 | $ 3,317,402,000 | $ 3,265,971,000
Financing Receivable, Nonaccrual, Interest Income | 710,000 | 1,900,000 |
Loans returned to accrual, interest income | 123,000 | 314,000 |
Loans receivable more than 90 days past due and still accruing interest | 0 | 0 |
Business Express [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable | 101,209,000 | $ 102,928,000 | $ 85,605,000
Business Express [Member] | Maximum [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable | $ 250,000 |  |

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