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Securities (Securities Available for Sale with Unrealized Losses) (Details) - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
Debt Securities, Available-for-Sale [Line Items]    
Available for sale, Losses less than 12 months, Fair Value $ 2,215,103 $ 448,456
Available for sale, Losses less than 12 months, Gross Unrealized Losses 23,673 2,396
Available for sale, Losses 12 months or longer, Fair Value 2,253,030 3,778,408
Available for sale, Losses 12 months or longer, Gross Unrealized Losses 304,709 403,006
Available for sale, Total, Fair Value 4,468,133 4,226,864
Available for sale, Total, Gross Unrealized Losses 328,382 405,402
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 11,910 17,468
Available for sale, Losses less than 12 months, Gross Unrealized Losses 101 9
Available for sale, Losses 12 months or longer, Fair Value 6,708 14,677
Available for sale, Losses 12 months or longer, Gross Unrealized Losses 1,074 1,189
Available for sale, Total, Fair Value 18,618 32,145
Available for sale, Total, Gross Unrealized Losses 1,175 1,198
Municipal Obligations [Member]    
Debt Securities, Available-for-Sale [Line Items]    
Available for sale, Losses less than 12 months, Fair Value 47,068 0
Available for sale, Losses less than 12 months, Gross Unrealized Losses 400 0
Available for sale, Losses 12 months or longer, Fair Value 95,944 124,852
Available for sale, Losses 12 months or longer, Gross Unrealized Losses 292 508
Available for sale, Total, Fair Value 143,012 124,852
Available for sale, Total, Gross Unrealized Losses 692 508
Residential Mortgage-Backed Securities [Member]    
Debt Securities, Available-for-Sale [Line Items]    
Available for sale, Losses less than 12 months, Fair Value 395,000 54,250
Available for sale, Losses less than 12 months, Gross Unrealized Losses 3,778 598
Available for sale, Losses 12 months or longer, Fair Value 1,283,981 1,442,746
Available for sale, Losses 12 months or longer, Gross Unrealized Losses 236,538 256,396
Available for sale, Total, Fair Value 1,678,981 1,496,996
Available for sale, Total, Gross Unrealized Losses 240,316 256,994
Commercial Mortgage-Backed Securities [Member]    
Debt Securities, Available-for-Sale [Line Items]    
Available for sale, Losses less than 12 months, Fair Value 1,758,136 374,740
Available for sale, Losses less than 12 months, Gross Unrealized Losses 19,383 1,787
Available for sale, Losses 12 months or longer, Fair Value 829,335 2,158,865
Available for sale, Losses 12 months or longer, Gross Unrealized Losses 64,869 143,081
Available for sale, Total, Fair Value 2,587,471 2,533,605
Available for sale, Total, Gross Unrealized Losses 84,252 144,868
Collateralized Mortgage Obligations [Member]    
Debt Securities, Available-for-Sale [Line Items]    
Available for sale, Losses less than 12 months, Fair Value 0 0
Available for sale, Losses less than 12 months, Gross Unrealized Losses 0 0
Available for sale, Losses 12 months or longer, Fair Value 23,814 25,946
Available for sale, Losses 12 months or longer, Gross Unrealized Losses 1,184 1,154
Available for sale, Total, Fair Value 23,814 25,946
Available for sale, Total, Gross Unrealized Losses 1,184 1,154
Corporate Debt Securities [Member]    
Debt Securities, Available-for-Sale [Line Items]    
Available for sale, Losses less than 12 months, Fair Value 2,989 1,998
Available for sale, Losses less than 12 months, Gross Unrealized Losses 11 2
Available for sale, Losses 12 months or longer, Fair Value 13,248 11,322
Available for sale, Losses 12 months or longer, Gross Unrealized Losses 752 678
Available for sale, Total, Fair Value 16,237 13,320
Available for sale, Total, Gross Unrealized Losses $ 763 $ 680