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Investment securities - Additional Information (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
USD ($)
security
Dec. 31, 2014
USD ($)
security
Dec. 31, 2013
USD ($)
Schedule of Available-for-sale Securities [Line Items]      
Unrealized gains, net | $ $ 2,985 $ 4,090  
Net of deferred income taxes | $ 1,608 2,202  
Proceeds from the sale of investment securities available-for-sale | $ 81,983 15,389 $ 4,573
Gross realized gains | $ 1,189 919 163
Gross realized losses | $ 58    
Income tax provision applicable to net realized gains | $ 416 301 55
Carrying value of securities pledged | $ $ 180,478 $ 216,192  
Number of investment securities held | security 88 52  
State and Municipals, Tax-Exempt [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Number of investment securities held | security 38 16  
Number of securities in continuous unrealized loss positions 12 months or longer | security 4 4  
State and Municipals, Taxable [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Number of investment securities held | security 1 1  
Number of securities in continuous unrealized loss positions 12 months or longer | security 1 1  
Peoples Bank [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Proceeds from the sale of investment securities available-for-sale | $   $ 722 253
U.S. Treasuries [Member] | State and Municipals, Tax-Exempt [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Number of investment securities held | security 1    
U.S. Government-Sponsored Enterprises State and Municipals [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Maximum percentage of stockholders' equity exceeded for securities of any individual issuer 10.00%    
Number of investment securities held | security 12 9  
Number of securities in continuous unrealized loss positions 12 months or longer | security 7 2  
Other-than-temporary impairments recognized | $ $ 0 $ 0 $ 0
Mortgage-backed Securities, Issued by Government Agencies [Member] | United States [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Number of investment securities held | security 36 26