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Stockholders' Equity - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at beginning of period $ 1,928,255,000 $ 1,855,473,000 $ 938,095,000
Total other comprehensive (loss) income (11,205,000) (3,527,000) (12,825,000)
Balance at end of period 1,903,211,000 1,928,255,000 1,855,473,000
AOCI Attributable to Parent      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at beginning of period (21,781,000) (14,657,000) (1,832,000)
Unrealized losses on securities available for sale (16,201,000) (5,796,000) (21,273,000)
Reclassification adjustments for gains realized in income 0 (301,000) (950,000)
Tax effect 4,996,000 2,570,000 9,398,000
Total other comprehensive (loss) income (11,205,000) (3,527,000) (12,825,000)
Reclassification to retained earnings due to the tax reform 0 (3,597,000) 0
Reclassification to retained earnings per ASU 2016-01 281,000 0 0
Balance at end of period (32,705,000) (21,781,000) (14,657,000)
Amount reclassified out of accumulated other comprehensive loss to reflect gain on sale of securities   $ 301,000 $ 950,000
AOCI Attributable to Parent | Accounting Standards Update 2018-02      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Reclassification to retained earnings due to the tax reform (3,600,000)    
AOCI Attributable to Parent | Accounting Standards Update 2016-01      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Reclassification to retained earnings per ASU 2016-01 $ 281,000