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Basis of Accounting and Consolidation - Additional Information (Details) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Jan. 02, 2020
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Apr. 21, 2020
Mar. 31, 2020
Jan. 01, 2020
Mar. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Basis Of Accounting And Consolidation [Line Items]                        
Loans acquired             $ 183,000,000          
Stock plans, term       10 years                
Maximum number of shares to be issued in stock incentive plan (in shares)   149,983   149,983                
Employee discount for employee stock purchase plan       5.00%                
Employee stock purchase plan, number of shares authorized   600,000   600,000                
Stock issued during period, shares, employee stock purchase plans   3,739 2,858 7,543 2,858              
Captive maximum gross premiums       $ 2,300,000                
Right of use lease assets   $ 15,979,000 $ 12,805,000 15,979,000 $ 12,805,000 $ 17,006,000            
Lease liabilities   16,014,000 12,815,000 16,014,000 12,815,000 17,007,000            
Allowance for credit losses on loans   $ 38,381,000 $ 26,359,000 $ 38,381,000 $ 26,359,000 $ 26,911,000   $ 32,876,000   $ 26,704,000   $ 26,189,000
ASU 2016-02                        
Basis Of Accounting And Consolidation [Line Items]                        
Right of use lease assets                     $ 14,100,000  
Lease liabilities                     $ 14,100,000  
ASU 2016-13                        
Basis Of Accounting And Consolidation [Line Items]                        
New accounting pronouncement or change in accounting principle, cumulative effect of change on equity or net assets                 $ 717,000      
Allowance for credit losses on loans                 28,583,000      
Off-balance sheet, credit loss, liability                 69,000      
Allowance for credit losses, held-to-maturity debt securities                 0      
Amortized cost of PCD assets reflected the addition to allowance for credit losses $ 833,000                      
ASU 2016-13 | Impact of ASU                        
Basis Of Accounting And Consolidation [Line Items]                        
Allowance for credit losses on loans                 1,672,000      
Off-balance sheet, credit loss, liability                 $ 69,000      
Stock Options                        
Basis Of Accounting And Consolidation [Line Items]                        
Common stock awarded in SI plan (in shares)       0                
Restricted Stock                        
Basis Of Accounting And Consolidation [Line Items]                        
Common stock awarded in SI plan (in shares)       25,200   25,950            
Restricted Stock Units (RSUs)                        
Basis Of Accounting And Consolidation [Line Items]                        
Common stock awarded in SI plan (in shares)       16,950   16,200