v3.26.1
Stockholders' Equity (Categories of Other Comprehensive Income) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Balance at beginning of period $ 3,015,537 $ 2,897,582 $ 3,053,829 $ 2,814,318
Other comprehensive income (loss) (13,861) 4,991 (27,346) 53,298
Balance at end of period 3,003,405 2,953,017 3,003,405 2,953,017
Accumulated Other Comprehensive Loss        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Balance at beginning of period (203,080) (236,234) (189,595) (284,541)
Other comprehensive income (loss) (13,861) 4,991 (27,346) 53,298
Balance at end of period (216,941) (231,243) (216,941) (231,243)
Unrealized Gain (Loss) on Investment Securities Available for Sale        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Balance at beginning of period (202,806) (250,105) (197,673) (300,161)
Other comprehensive income (loss) (6,075) 5,910 (11,208) 55,966
Balance at end of period (208,881) (244,195) (208,881) (244,195)
Unrealized Gain (Loss) on Derivative Instruments        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Balance at beginning of period (274) 13,871 8,078 15,620
Other comprehensive income (loss) (7,786) (919) (16,138) (2,668)
Balance at end of period $ (8,060) $ 12,952 $ (8,060) $ 12,952