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Securities - Additional Information (Details)
$ in Thousands
1 Months Ended 3 Months Ended
May 07, 2020
USD ($)
Mar. 31, 2020
USD ($)
security
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
security
Debt and Equity Securities, FV-NI [Line Items]        
Number of securities holdings | security   0   0
Shareholders' equity percentage (greater than)   10.00%   10.00%
Tax provision related to net realized gains   $ 0 $ 31  
Proceeds   0 11,403  
Net realized gains on available-for-sale securities (includes $0 and $148 accumulated other comprehensive income reclassifications for net realized gains on available-for-sale securities, respectively)   0 148  
Gross Gains   0 152  
Gross Losses   0 $ 4  
Total Securities Available For Sale   570,582   $ 542,313
Collateral Pledged        
Debt and Equity Securities, FV-NI [Line Items]        
Debt securities, trading, restricted   $ 409,616   $ 405,200
Subsequent Event        
Debt and Equity Securities, FV-NI [Line Items]        
Proceeds $ 50,902      
Net realized gains on available-for-sale securities (includes $0 and $148 accumulated other comprehensive income reclassifications for net realized gains on available-for-sale securities, respectively) 2,033      
Gross Gains 2,100      
Gross Losses $ 67