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Stockholders' Equity - Changes in Accumulated Other Comprehensive (Loss) Income (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Equity [Abstract]            
Balance at beginning of period $ (15,358,000) $ (38,640,000) $ (32,705,000) $ (21,781,000)    
Unrealized gain (loss) on securities available for sale 32,523,000 (9,249,000) 57,189,000 (33,898,000)    
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent (129,000) 0 (129,000) 0    
Tax effect (9,613,000) 2,767,000 (16,932,000) 10,276,000    
Total other comprehensive income (loss) 22,781,000 (6,482,000) 40,128,000 (23,622,000)    
Reclassification to retained earnings per ASU 2016-01 0 0 0 281,000    
Balance at end of period 7,423,000 (45,122,000) 7,423,000 (45,122,000)    
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]            
Reclassification adjustments for net gains realized in net income 129,000 0 129,000 0    
Reclassification of unrealized losses on equity investments to retained earnings - ASU 2016-01           $ (188,000)
Other reclassifications out of accumulated other comprehensive (loss) income 0 0 0 0    
Accumulated other comprehensive (loss) income, net            
Equity [Abstract]            
Total other comprehensive income (loss) $ 22,781,000 $ (6,482,000) $ 40,128,000 $ (23,622,000)    
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]            
Reclassification of unrealized losses on equity investments to retained earnings - ASU 2016-01         $ 281,000 $ 281,000