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Stockholders' Equity - Changes in Accumulated Other Comprehensive (Loss) Income (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period $ 2,045,581,000 $ 2,018,088,000 $ 2,053,745,000 $ 2,036,011,000
Unrealized net gains (losses) on securities available for sale 14,186,000 3,270,000 (26,617,000) 42,123,000
Unrealized net gains (losses) on interest rate swaps used for cash flow hedge (297,000) (711,000) 1,523,000 (711,000)
Reclassification adjustments for net losses (gains) realized in net income 73,000 (139,000) 139,000 (139,000)
Tax effect (4,134,000) (720,000) 7,253,000 (12,273,000)
Other comprehensive income (loss), net of tax 9,828,000 1,700,000 (17,702,000) 29,000,000
Balance at end of period 2,092,870,000 2,030,776,000 2,092,870,000 2,030,776,000
Accumulated other comprehensive income, net        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period 5,223,000 36,449,000 32,753,000 9,149,000
Other comprehensive income (loss), net of tax 9,828,000 1,700,000 (17,702,000) 29,000,000
Balance at end of period $ 15,051,000 $ 38,149,000 $ 15,051,000 $ 38,149,000