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Securities (Securities Available for Sale with Unrealized Losses) (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Debt Securities, Available-for-Sale [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | $ 247,661 | $ 686,908
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 1,582 | 8,163
Available for sale, Losses 12 months or longer, Fair Value | 3,957,221 | 3,921,412
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 523,085 | 607,509
Available for sale, Total, Fair Value | 4,204,882 | 4,608,320
Available for sale, Total, Gross Unrealized Losses | 524,667 | 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 | 17,540 | 130,453
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 206 | 2,243
Available for sale, Losses 12 months or longer, Fair Value | 7,115 | 7,247
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 1,445 | 1,651
Available for sale, Total, Fair Value | 24,655 | 137,700
Available for sale, Total, Gross Unrealized Losses | 1,651 | 3,894
Municipal Obligations [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | 18,742 | 24,149
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 127 | 247
Available for sale, Losses 12 months or longer, Fair Value | 167,611 | 170,110
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 3,513 | 3,695
Available for sale, Total, Fair Value | 186,353 | 194,259
Available for sale, Total, Gross Unrealized Losses | 3,640 | 3,942
Residential Mortgage-Backed Securities [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | 138,747 | 347,772
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 718 | 2,935
Available for sale, Losses 12 months or longer, Fair Value | 1,543,488 | 1,554,001
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 311,134 | 350,619
Available for sale, Total, Fair Value | 1,682,235 | 1,901,773
Available for sale, Total, Gross Unrealized Losses | 311,852 | 353,554
Commercial Mortgage-Backed Securities [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | 72,632 | 184,534
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 531 | 2,738
Available for sale, Losses 12 months or longer, Fair Value | 2,191,851 | 2,139,191
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 204,121 | 247,854
Available for sale, Total, Fair Value | 2,264,483 | 2,323,725
Available for sale, Total, Gross Unrealized Losses | 204,652 | 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 | 32,704 | 35,247
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 1,824 | 2,306
Available for sale, Total, Fair Value | 32,704 | 35,247
Available for sale, Total, Gross Unrealized Losses | 1,824 | 2,306
Corporate Debt Securities [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 | 14,452 | 15,616
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 1,048 | 1,384
Available for sale, Total, Fair Value | 14,452 | 15,616
Available for sale, Total, Gross Unrealized Losses | $ 1,048 | $ 1,384

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