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Stockholders' Equity - Changes in Accumulated Other Comprehensive (Loss) Income (Details) - USD ($)
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance at beginning of period $ 2,053,745,000 $ 2,036,011,000
Unrealized gain on securities available for sale (40,803,000) 38,853,000
Unrealized loss on interest rate swaps used for cash flow hedge 602,000 0
Reclassification adjustments for net gains realize in net income 66,000 0
Tax effect 12,605,000 (11,553,000)
Other comprehensive (loss) income, net of tax (27,530,000) 27,300,000
Balance at end of period 2,045,581,000 2,018,088,000
Accumulated other comprehensive income, net    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance at beginning of period 32,753,000 9,149,000
Other comprehensive (loss) income, net of tax (27,530,000) 27,300,000
Balance at end of period $ 5,223,000 $ 36,449,000