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Securities (Securities Available for Sale with Unrealized Losses) (Details) - USD ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Debt Securities, Available-for-Sale [Line Items]    
Available for sale, Losses less than 12 months, Fair Value $ 448,456 $ 686,908
Available for sale, Losses less than 12 months, Gross Unrealized Losses 2,396 8,163
Available for sale, Losses 12 months or longer, Fair Value 3,778,408 3,921,412
Available for sale, Losses 12 months or longer, Gross Unrealized Losses 403,006 607,509
Available for sale, Total, Fair Value 4,226,864 4,608,320
Available for sale, Total, Gross Unrealized Losses 405,402 615,672
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 17,468 130,453
Available for sale, Losses less than 12 months, Gross Unrealized Losses 9 2,243
Available for sale, Losses 12 months or longer, Fair Value 14,677 7,247
Available for sale, Losses 12 months or longer, Gross Unrealized Losses 1,189 1,651
Available for sale, Total, Fair Value 32,145 137,700
Available for sale, Total, Gross Unrealized Losses 1,198 3,894
Municipal Obligations [Member]    
Debt Securities, Available-for-Sale [Line Items]    
Available for sale, Losses less than 12 months, Fair Value 0 24,149
Available for sale, Losses less than 12 months, Gross Unrealized Losses 0 247
Available for sale, Losses 12 months or longer, Fair Value 124,852 170,110
Available for sale, Losses 12 months or longer, Gross Unrealized Losses 508 3,695
Available for sale, Total, Fair Value 124,852 194,259
Available for sale, Total, Gross Unrealized Losses 508 3,942
Residential Mortgage-Backed Securities [Member]    
Debt Securities, Available-for-Sale [Line Items]    
Available for sale, Losses less than 12 months, Fair Value 54,250 347,772
Available for sale, Losses less than 12 months, Gross Unrealized Losses 598 2,935
Available for sale, Losses 12 months or longer, Fair Value 1,442,746 1,554,001
Available for sale, Losses 12 months or longer, Gross Unrealized Losses 256,396 350,619
Available for sale, Total, Fair Value 1,496,996 1,901,773
Available for sale, Total, Gross Unrealized Losses 256,994 353,554
Commercial Mortgage-Backed Securities [Member]    
Debt Securities, Available-for-Sale [Line Items]    
Available for sale, Losses less than 12 months, Fair Value 374,740 184,534
Available for sale, Losses less than 12 months, Gross Unrealized Losses 1,787 2,738
Available for sale, Losses 12 months or longer, Fair Value 2,158,865 2,139,191
Available for sale, Losses 12 months or longer, Gross Unrealized Losses 143,081 247,854
Available for sale, Total, Fair Value 2,533,605 2,323,725
Available for sale, Total, Gross Unrealized Losses 144,868 250,592
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
Available for sale, Losses 12 months or longer, Fair Value 25,946 35,247
Available for sale, Losses 12 months or longer, Gross Unrealized Losses 1,154 2,306
Available for sale, Total, Fair Value 25,946 35,247
Available for sale, Total, Gross Unrealized Losses 1,154 2,306
Corporate Debt Securities [Member]    
Debt Securities, Available-for-Sale [Line Items]    
Available for sale, Losses less than 12 months, Fair Value 1,998 0
Available for sale, Losses less than 12 months, Gross Unrealized Losses 2 0
Available for sale, Losses 12 months or longer, Fair Value 11,322 15,616
Available for sale, Losses 12 months or longer, Gross Unrealized Losses 678 1,384
Available for sale, Total, Fair Value 13,320 15,616
Available for sale, Total, Gross Unrealized Losses $ 680 $ 1,384