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Securities (Securities Available for Sale with Unrealized Losses) (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Debt Securities, Available-for-Sale [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | $ 163,091 | $ 686,908
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 988 | 8,163
Available for sale, Losses 12 months or longer, Fair Value | 3,943,991 | 3,921,412
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 485,423 | 607,509
Available for sale, Total, Fair Value | 4,107,082 | 4,608,320
Available for sale, Total, Gross Unrealized Losses | 486,411 | 615,672
U.S. Treasury And Government Agency Securities [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | 35,206 | 130,453
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 349 | 2,243
Available for sale, Losses 12 months or longer, Fair Value | 7,150 | 7,247
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 1,408 | 1,651
Available for sale, Total, Fair Value | 42,356 | 137,700
Available for sale, Total, Gross Unrealized Losses | 1,757 | 3,894
Municipal Obligations [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | 17,927 | 24,149
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 37 | 247
Available for sale, Losses 12 months or longer, Fair Value | 168,200 | 170,110
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 2,246 | 3,695
Available for sale, Total, Fair Value | 186,127 | 194,259
Available for sale, Total, Gross Unrealized Losses | 2,283 | 3,942
Residential Mortgage-Backed Securities [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | 85,738 | 347,772
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 374 | 2,935
Available for sale, Losses 12 months or longer, Fair Value | 1,501,807 | 1,554,001
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 299,885 | 350,619
Available for sale, Total, Fair Value | 1,587,545 | 1,901,773
Available for sale, Total, Gross Unrealized Losses | 300,259 | 353,554
Commercial Mortgage-Backed Securities [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | 22,229 | 184,534
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 219 | 2,738
Available for sale, Losses 12 months or longer, Fair Value | 2,222,358 | 2,139,191
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 179,142 | 247,854
Available for sale, Total, Fair Value | 2,244,587 | 2,323,725
Available for sale, Total, Gross Unrealized Losses | 179,361 | 250,592
Collateralized Mortgage Obligations [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value |  | 0
Available for sale, Losses less than 12 months, Gross Unrealized Losses |  | 0
Available for sale, Losses 12 months or longer, Fair Value | 30,153 | 35,247
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 1,565 | 2,306
Available for sale, Total, Fair Value | 30,153 | 35,247
Available for sale, Total, Gross Unrealized Losses | 1,565 | 2,306
Corporate Debt Securities [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | 1,991 | 0
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 9 | 0
Available for sale, Losses 12 months or longer, Fair Value | 14,323 | 15,616
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 1,177 | 1,384
Available for sale, Total, Fair Value | 16,314 | 15,616
Available for sale, Total, Gross Unrealized Losses | $ 1,186 | $ 1,384

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