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Securities - Additional Information (Details)
$ in Thousands
Jun. 30, 2019
USD ($)
security
Dec. 31, 2018
USD ($)
security
Jun. 30, 2018
USD ($)
Jan. 01, 2018
USD ($)
Debt Securities, Available-for-sale [Line Items]        
Number of debt securities in unrealized loss position | security 19 65    
Securities pledged for regulatory and legal requirements $ 201,200 $ 236,000    
ASU No. 2016-01        
Debt Securities, Available-for-sale [Line Items]        
Reclassification of net unrealized gains on equity securities [1]     $ 0  
ASU No. 2016-01 | Retained Earnings        
Debt Securities, Available-for-sale [Line Items]        
Reclassification of net unrealized gains on equity securities     862 [1] $ 900
ASU No. 2016-01 | AOCI Attributable to Parent        
Debt Securities, Available-for-sale [Line Items]        
Reclassification of net unrealized gains on equity securities     $ (862) [1] $ (900)
[1] Reclassification due to the adoption of ASU No. 2016-01.