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Stockholders' Equity - Changes in Accumulated Other Comprehensive (Loss) Income (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period $ 2,000,369,000 $ 2,092,870,000 $ 2,092,983,000 $ 2,053,745,000
Unrealized net losses on securities available for sale (112,043,000) (16,433,000) (308,974,000) (43,050,000)
OCI, Debt Securities, Available-for-Sale, Transfer to Held-to-Maturity, Adjustment from AOCI for Amortization of Gain (Loss), before Tax 0 0 (36,576,000) 0
Unrealized net gains on interest rate swaps used for cash flow hedge 18,893,000 120,000 24,901,000 1,643,000
Reclassification adjustments for net losses realized in net income 662,000 88,000 688,000 227,000
Tax effect 27,660,000 4,717,000 94,838,000 11,970,000
Other comprehensive loss, net of tax (64,828,000) (11,508,000) (225,123,000) (29,210,000)
Balance at end of period 1,975,725,000 2,074,398,000 1,975,725,000 2,074,398,000
Share repurchase program, authorized amount $ 50,000,000   $ 50,000,000  
Common stock repurchased and recorded as treasury stock (in shares) 0   1,038,986  
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax $ 511,000 (88,000) $ 561,000 (227,000)
Reclassification from AOCI, Debt Securities transferred from AFS to HTM amortization of unrealized losses, before tax 1,200,000 0 1,200,000 0
Accumulated other comprehensive income (loss), net        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period (171,707,000) 15,051,000 (11,412,000) 32,753,000
Other comprehensive loss, net of tax (64,828,000) (11,508,000) (225,123,000) (29,210,000)
Balance at end of period $ (236,535,000) $ 3,543,000 $ (236,535,000) $ 3,543,000