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Investment Securities (Narrative) (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Schedule of Investments [Line Items] |  |  |
Debt Securities, Available-for-sale | $ 1,248,787,000 |  | $ 1,332,842,000
Debt Securities, Available-for-sale, Unrealized Loss Position | 1,078,968,000 |  | 1,206,855,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 86,912,000 |  | 87,155,000
Securities Available-for-Sale, 12 months or longer, Fair value | 1,003,286,000 |  | 1,150,640,000
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |  | 0
Other than Temporary Impairment Losses, Investments | 0 | $ 0 |
Debt Securities, Available-for-sale, Amortized Cost | $ 1,334,973,000 |  | 1,418,770,000
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 21.00% |  |
Gain (Loss) on Sale of Investments | $ 398,000 | $ 0 |
Debt securities available for sale, securities sold | 31,200,000 |  |
U.S. Government Sponsored Entities Asset-Backed Securities [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Debt Securities, Available-for-sale | 603,009,000 |  | 635,475,000
Debt Securities, Available-for-sale, Unrealized Loss Position | 601,810,000 |  | 634,261,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 69,466,000 |  | 68,193,000
Securities Available-for-Sale, 12 months or longer, Fair value | 601,810,000 |  | 634,261,000
Debt Securities, Available-for-sale, Amortized Cost | 672,462,000 |  | 703,645,000
USGovernmentSponsored asset backed securities and US Treasury obligations |  |  |
Schedule of Investments [Line Items] |  |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 69,500,000 |  |
Collateral Pledged [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Debt Securities, Available-for-sale, Restricted | $ 762,100,000 |  | $ 602,000,000

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