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Basis of Presentation - Additional Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Basis Of Presentation [Line Items]        
Operating lease, right-of-use asset $ 3,609   $ 3,609  
Operating lease, liability 3,633   3,633  
Revenue, remaining performance obligation, amount 0   0  
Contract with customer, liability, total 0   0  
Service and Other Charges On Deposit Accounts, Mortgage Fees from Secondary Market Transactions at the Bank, ATM Fee Income and Other Non-Interest Income [Member]        
Basis Of Presentation [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 800 $ 800 2,400 $ 900
Accounting Standards Update 2016-02 [Member]        
Basis Of Presentation [Line Items]        
Operating lease, right-of-use asset 3,600   3,600  
Operating lease, liability $ 3,600   $ 3,600