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Investment securities - Restricted Investment In Stock (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
security
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Available-for-sale and Held-to-maturity securities      
Unrealized gains (loss), net | $ $ 1,450 $ (2,568)  
Net of deferred income taxes | $ 385 683  
Proceeds from sale of available-for-sale investment securities | $ 9,677 0  
Gross realized gains | $ 66    
Gross realized losses | $ $ 43    
Number of investment securities held 70    
Other-than-temporary impairments recognized | $ $ 0 $ 0 $ 0
State and Municipals, Tax-exempt      
Available-for-sale and Held-to-maturity securities      
Number of investment securities held 6    
Number of securities in continuous unrealized loss positions 12 months or longer 2    
State and Municipals, Taxable      
Available-for-sale and Held-to-maturity securities      
Number of investment securities held 22    
U.S. government-sponsored enterprises state and municipals      
Available-for-sale and Held-to-maturity securities      
Maximum percentage of stockholders' equity exceeded for securities of any individual issuer 10.00% 10.00%  
Number of investment securities held 18    
Number of securities in continuous unrealized loss positions 12 months or longer 16    
Mortgage-backed Securities, Issued by Government Agencies | United States      
Available-for-sale and Held-to-maturity securities      
Number of investment securities held 24    
Mortgage-backed Securities, U.S. government-sponsored enterprises      
Available-for-sale and Held-to-maturity securities      
Number of securities in continuous unrealized loss positions 12 months or longer 17