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Summary of significant accounting policies (Details)
 12 Months Ended
Dec. 31, 2019
USD ($)
Office
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jan. 01, 2019
USD ($)
Number of full-service community banking offices | Office 28      
Number of limited purpose banking offices $ 1      
Minimum lease payments due 8,227,000      
Reclassification of prior period items amounts effect on net income $ 0      
Debt service coverage ratio 1.2      
Non performing loans past due period for Non-accrual status 90 days      
Maximum days of consumer loans past due 120 days      
Impairment losses on intangible assets $ 0 $ 0 $ 0  
Advertising expense $ 873,000 720,000 942,000  
Income tax benefit recognition threshold 50.00%      
Unrecognized tax benefit or accrued interest and penalties $ 0 $ 0 $ 0  
Lease liabilities for operating leases 6,194,000      
Right-of-use assets $ 6,125,000      
Minimum        
Contractual terms 6 months      
Maximum        
Finite useful life of intangible assets 10 years      
Commercial Real Estate        
Maximum loan to value percentage 80.00%      
Residential Mortgage | Maximum        
Maximum amortization period 30 years      
Accounting Standards Update 2016-02 | Restatement Adjustment        
Lease liabilities for operating leases       $ 6,523,000
Right-of-use assets       $ 6,523,000