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Equity Investment Securities - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Dec. 31, 2017
Investment [Line Items]        
Reclassification of unrealized losses on equity investments to retained earnings - ASU 2016-01       $ (188,000)
Equity investments with readily determinable fair value $ 48,750,000 $ 48,750,000 $ 49,835,000  
Sale of Equity Investments with Readily Determinable Fair Values 2,600,000      
Equity Securities, FV-NI, Gain (Loss) 0      
Equity investments without readily determinable fair values 26,700,000 26,700,000 26,400,000  
Equity investments without readily determinable fair values, impairment 0 0    
Equity investments without readily determinable fair values, observable price changes 0 0    
Mutual funds        
Investment [Line Items]        
Equity investments with readily determinable fair value 22,100,000 22,100,000 21,500,000  
Equity stock in other institutions        
Investment [Line Items]        
Equity investments with readily determinable fair value     1,900,000  
Correspondent bank stock        
Investment [Line Items]        
Equity investments without readily determinable fair values 370,000 370,000 370,000  
Community development financial institutions        
Investment [Line Items]        
Equity investments without readily determinable fair values 1,000,000.0 1,000,000.0 1,000,000.0  
Community reinvestment act investments        
Investment [Line Items]        
Equity investments without readily determinable fair values $ 25,300,000 $ 25,300,000 25,100,000  
Retained earnings        
Investment [Line Items]        
Reclassification of unrealized losses on equity investments to retained earnings - ASU 2016-01     $ (469,000) $ (469,000)