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Investment securities - Additional Information (Details 4)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
security
Sep. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
security
Schedule of Available-for-sale Securities [Line Items]          
Carrying value of securities pledged | $ $ 206,467   $ 206,467   $ 216,192
Number of investment securities held     97   52
State and Municipals, Tax-Exempt [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Number of investment securities held     76   16
Number of securities in continuous unrealized loss positions 12 months or longer         4
State and Municipals, Taxable [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Number of investment securities held     1   1
Number of securities in continuous unrealized loss positions 12 months or longer         1
Credit Concentration Risk [Member] | Stockholders' Equity, Total [Member] | Us Government Agency And Sponsored Enterprises [Member] | Greater Than [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Maximum percentage of stockholders' equity exceeded for securities of any individual issuer     10.00%   10.00%
U.S. Government-Sponsored Enterprises State and Municipals [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Number of investment securities held     1   9
Number of securities in continuous unrealized loss positions 12 months or longer         2
Other-than-temporary impairments recognized | $ $ 0 $ 0 $ 0 $ 0  
Mortgage-Backed Securities, U.S. Government-Sponsored Enterprises [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Number of investment securities held     19   26
Number of securities in continuous unrealized loss positions 12 months or longer         8
Mortgage-Backed Securities, U.S. Government-Sponsored Enterprises [Member] | State and Municipals, Tax-Exempt [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Number of securities in continuous unrealized loss positions 12 months or longer         3