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Allowance for loan losses and credit quality Allocation of Investment in Loans, by Impairment Methodology (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]    
Individually evaluated for impairment $ 5,093 $ 4,680
Collectively evaluated for impairment 485,131 466,246
Loans Not Acquired 490,224 470,926
Acquired loans 7,675 9,052
Loans 497,899 479,978
Residential Real Estate [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Individually evaluated for impairment 1,185 950
Collectively evaluated for impairment 161,106 159,888
Loans Not Acquired 162,291 160,838
Acquired loans 4,306 4,637
Loans 166,597 165,475
Construction Real Estate [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Individually evaluated for impairment 93 275
Collectively evaluated for impairment 37,200 36,983
Loans Not Acquired 37,293 37,258
Acquired loans 0 0
Loans 37,293 37,258
Commercial Real Estate [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Individually evaluated for impairment 3,815 3,332
Collectively evaluated for impairment 212,833 203,963
Loans Not Acquired 216,648 207,295
Acquired loans 3,369 4,415
Loans 220,017 211,710
Commercial [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Individually evaluated for impairment 0 123
Collectively evaluated for impairment 22,570 20,497
Loans Not Acquired 22,570 20,620
Acquired loans 0 0
Loans 22,570 20,620
Consumer [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Individually evaluated for impairment 0 0
Collectively evaluated for impairment 4,242 4,435
Loans Not Acquired 4,242 4,435
Acquired loans 0 0
Loans 4,242 4,435
Municipal [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Individually evaluated for impairment 0 0
Collectively evaluated for impairment 47,180 40,480
Loans Not Acquired 47,180 40,480
Acquired loans 0 0
Loans $ 47,180 $ 40,480