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Stockholders' Equity (Categories of Other Comprehensive Income) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Balance $ 2,897,582 $ 2,640,392 $ 2,814,318 $ 2,577,921
Other comprehensive income (loss) 4,991 22,306 53,298 55,799
Balance 2,953,017 2,699,348 2,953,017 2,699,348
Accumulated Other Comprehensive Loss        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Balance (236,234) (323,928) (284,541) (357,421)
Other comprehensive income (loss) 4,991 22,306 53,298 55,799
Balance (231,243) (301,622) (231,243) (301,622)
Unrealized Gains on Investment Securities Available for Sale        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Balance (250,105) (368,789) (300,161) (395,746)
Other comprehensive income (loss) 5,910 26,521 55,966 53,478
Balance (244,195) (342,268) (244,195) (342,268)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Balance 13,871 44,861 15,620 38,325
Other comprehensive income (loss) (919) (4,215) (2,668) 2,321
Balance $ 12,952 $ 40,646 $ 12,952 $ 40,646