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Securities (Amortized Cost and Fair Value of Debt Securities Held to Maturity) (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Gross Amortized Cost | $ 2,197,611 | $ 2,435,663
Securities Held to Maturity, Gross Unrealized Gains | 849 | 169
Securities Held to Maturity, Gross Unrealized Losses | 133,869 | 202,306
Securities Held to Maturity, Fair Value | 2,064,591 | 2,233,526
U.S. Treasury And Government Agency Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Gross Amortized Cost | 379,390 | 394,689
Securities Held to Maturity, Gross Unrealized Gains | 230 |
Securities Held to Maturity, Gross Unrealized Losses | 32,414 | 45,876
Securities Held to Maturity, Fair Value | 347,206 | 348,813
Municipal Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Gross Amortized Cost | 545,276 | 623,907
Securities Held to Maturity, Gross Unrealized Gains | 619 | 169
Securities Held to Maturity, Gross Unrealized Losses | 12,206 | 20,867
Securities Held to Maturity, Fair Value | 533,689 | 603,209
Residential Mortgage-Backed Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Gross Amortized Cost | 516,257 | 573,057
Securities Held to Maturity, Gross Unrealized Losses | 38,581 | 61,525
Securities Held to Maturity, Fair Value | 477,676 | 511,532
Commercial Mortgage-Backed Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Gross Amortized Cost | 735,969 | 818,604
Securities Held to Maturity, Gross Unrealized Losses | 50,025 | 72,854
Securities Held to Maturity, Fair Value | 685,944 | 745,750
Collateralized Mortgage Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Gross Amortized Cost | 20,719 | 25,406
Securities Held to Maturity, Gross Unrealized Losses | 643 | 1,184
Securities Held to Maturity, Fair Value | $ 20,076 | $ 24,222

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