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Stockholders' Equity - Changes in Accumulated Other Comprehensive (Loss) Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period $ 2,058,580 $ 2,041,057 $ 2,019,328 $ 2,092,983
Unrealized net (losses) gains on securities available for sale (31,071) (55,658) 144 (196,931)
Unrealized net losses on securities available for sale transferred to held to maturity 0 (36,576) 0 (36,576)
Unrealized net gains on interest rate contracts used for cash flow hedge 13,653 2,006 7,715 6,008
Reclassification adjustments for net (gains) losses realized in net income (3,322) (38) (5,060) 26
Tax effect 6,113 26,724 (826) 67,178
Other comprehensive (loss) income, net of tax (14,627) (63,542) 1,973 (160,295)
Balance at end of period 2,067,998 2,000,369 2,067,998 2,000,369
Accumulated other comprehensive loss, net        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period (214,257) (108,165) (230,857) (11,412)
Other comprehensive (loss) income, net of tax (14,627) (63,542) 1,973 (160,295)
Balance at end of period $ (228,884) $ (171,707) $ (228,884) $ (171,707)