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Investment securities - Additional Information (Details) $ in Thousands | 12 Months Ended
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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 |

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