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Equity Investments - Narrative (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Jan. 01, 2018
Investment [Line Items]    
Reclassification of unrealized losses on equity investments to retained earnings - ASU 2016-01   $ (188,000)
Equity investments without readily determinable fair values $ 26,400,000  
Equity investments without readily determinable fair values, impairment 0  
Mutual funds    
Investment [Line Items]    
Equity investments without readily determinable fair values 21,500,000  
Equity stock in other institutions    
Investment [Line Items]    
Equity investments without readily determinable fair values 1,900,000  
Correspondent bank stock    
Investment [Line Items]    
Equity investments without readily determinable fair values 370,000  
Community development financial institutions    
Investment [Line Items]    
Equity investments without readily determinable fair values 1,000,000  
Community reinvestment act investments    
Investment [Line Items]    
Equity investments without readily determinable fair values 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)