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Shareholders' Equity and Other Comprehensive Income (Loss) - OCI (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]      
Beginning balance $ 5,119,993    
Other comprehensive income (loss) before reclassifications (161,327) $ 123,387  
Amounts reclassified from AOCI 30,206 29,403  
Total other comprehensive income (loss), net of tax amount (131,121) 152,790  
Ending balance 5,017,918    
Accumulated other comprehensive income (loss), net (1,248,194)   $ (1,117,073)
Total      
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]      
Beginning balance (1,117,073) (1,442,117)  
Total other comprehensive income (loss), net of tax amount (131,121) 152,790  
Ending balance (1,248,194) (1,289,327)  
Net unrealized gains (losses) on investment securities available for sale      
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]      
Beginning balance (998,259) (1,220,263)  
Other comprehensive income (loss) before reclassifications (118,050) 115,821  
Amounts reclassified from AOCI 0 (779)  
Total other comprehensive income (loss), net of tax amount (118,050) 115,042  
Ending balance (1,116,309) (1,105,221)  
Accumulated other comprehensive income (loss), net (10,200) (13,300)  
Net unrealized gains (losses) on cash flow hedges      
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]      
Beginning balance (118,814) (221,854)  
Other comprehensive income (loss) before reclassifications (43,277) 7,566  
Amounts reclassified from AOCI 30,206 30,182  
Total other comprehensive income (loss), net of tax amount (13,071) 37,748  
Ending balance (131,885) (184,106)  
Accumulated other comprehensive income (loss), net $ (11,600) $ (12,100)