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Loans Receivable and Allowance for Loan Losses - Additional Information (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
loan
Jun. 30, 2018
USD ($)
loan
Jun. 30, 2019
USD ($)
loan
loan_pool
Jun. 30, 2018
USD ($)
loan
Dec. 31, 2018
USD ($)
Receivables [Abstract]          
Commitment to lend $ 736,000   $ 736,000   $ 736,000
Credit for unfunded loan commitments $ 0 $ 150,000 $ 0 $ (50,000)  
Financing Receivable, Allowance for Credit Loss [Line Items]          
Number of non-homogeneous loan pools | loan_pool     19    
Positive or negative qualitative adjustment of the Loss Migration Ratio 0.50%   0.50%    
Provision (credit) for loan losses $ 1,200,000 2,300,000 $ 4,200,000 4,800,000  
Specific reserves TDRs 4,600,000   4,600,000   $ 3,000,000.0
Specific reserves 31,000 44,000 52,000 1,100,000  
Total charge-offs of TDR loans modified 33,000 131,000 33,000 131,000  
Charge offs 67,000 51,000 29,000 51,000  
Specific reserves for the TDRs that had payment defaults $ 85,000 $ 33,000 $ 119,000 $ 33,000  
Number of Loans | loan 12 4 13 6  
Balance $ 588,000 $ 1,188,000 $ 656,000 $ 4,296,000  
Acquired Loans          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Provision (credit) for loan losses (503,000) (253,000) (383,000) (2,500,000)  
Provision (credit) for PCI loan losses $ (1,200,000) $ (449,000) $ (2,200,000) $ (637,000)  
Number of Loans | loan 5 0 6 2  
Balance $ 457,000 $ 0 $ 525,000 $ 3,108,000  
Acquired Loans | Real estate          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Provision (credit) for loan losses $ (636,000) $ (141,000) $ (675,000) $ (314,000)  
Number of Loans | loan 0 0 0 0  
Balance $ 0 $ 0 $ 0 $ 0  
Acquired Loans | Real estate | Payment concession          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Number of Loans | loan     4 1  
Balance     $ 218,000 $ 3,100,000  
Acquired Loans | Commercial business          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Provision (credit) for loan losses $ 195,000 $ (96,000) $ 313,000 $ (2,142,000)  
Number of Loans | loan 3 0 4 1  
Balance $ 150,000 $ 0 $ 218,000 $ 0  
Acquired Loans | Commercial business | Payment concession          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Number of Loans | loan     3    
Balance     $ 218,000    
Acquired Loans | Consumer And Other Portfolio Segment [Member]          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Number of Loans | loan     0 0  
Balance     $ 0 $ 0  
Acquired Loans | Consumer and other          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Provision (credit) for loan losses $ (62,000) $ 19,000 $ (21,000) $ 16,000  
Number of Loans | loan 0 0      
Balance $ 0 $ 0      
Legacy Loans          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Number of Loans | loan 7 4 7 4  
Balance $ 131,000 $ 1,188,000 $ 131,000 $ 1,188,000  
Legacy Loans | Real estate          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Provision (credit) for loan losses $ 1,195,000 $ 1,776,000 $ (3,463,000) $ 2,255,000  
Number of Loans | loan 0 0 0 0  
Balance $ 0 $ 0 $ 0 $ 0  
Legacy Loans | Real estate | Payment concession          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Number of Loans | loan     1    
Balance     $ 92,000    
Legacy Loans | Commercial business          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Provision (credit) for loan losses $ 183,000 $ 487,000 $ 6,804,000 $ 3,776,000  
Number of Loans | loan 0 4 0 4  
Balance $ 0 $ 1,188,000 $ 0 $ 1,188,000  
Legacy Loans | Commercial business | Maturity / amortization concession          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Number of Loans | loan     1 4  
Balance     $ 673,000 $ 1,200,000  
Legacy Loans | Consumer And Other Portfolio Segment [Member]          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Number of Loans | loan     6 0  
Balance     $ 39,000 $ 0  
Legacy Loans | Consumer and other          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Provision (credit) for loan losses $ 14,000 $ 1,086,000 $ 952,000 $ 1,963,000  
Number of Loans | loan 6 0      
Balance $ 39,000 $ 0      
Legacy Loans | Consumer and other | Payment concession          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Number of Loans | loan     6    
Balance     $ 39,000    
Commercial real estate loan portfolio          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Number of non-homogeneous loan pools | loan_pool     14    
Commercial and industrial loan portfolio          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Number of non-homogeneous loan pools | loan_pool     5    
Doubtful or Loss          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Scope for evaluation of individual impairment, minimum threshold 500,000   $ 500,000    
Scope for evaluation of collective impairment, maximum threshold $ 500,000   $ 500,000