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Stockholders' Equity (Categories of Other Comprehensive Income) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Balance $ 2,953,017 $ 2,699,348 $ 2,814,318 $ 2,577,921
Other comprehensive income (loss) 26,085 63,258 79,383 119,057
Balance 3,032,374 2,807,804 3,032,374 2,807,804
Accumulated Other Comprehensive Loss        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Balance (231,243) (301,622) (284,541) (357,421)
Other comprehensive income (loss) 26,085 63,258 79,383 119,057
Balance (205,158) (238,364) (205,158) (238,364)
Unrealized Gains on Investment Securities Available for Sale        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Balance (244,195) (342,268) (300,161) (395,746)
Other comprehensive income (loss) 29,640 92,158 85,606 145,636
Balance (214,555) (250,110) (214,555) (250,110)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Balance 12,952 40,646 15,620 38,325
Other comprehensive income (loss) (3,555) (28,900) (6,223) (26,579)
Balance $ 9,397 $ 11,746 $ 9,397 $ 11,746