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Investment securities - Additional Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($) security	Dec. 31, 2015 USD ($) security	Dec. 31, 2014 USD ($)
Available-for-sale and Held-to-maturity securities
Unrealized gains, net | $	$ 359	$ 2,985
Net of deferred income taxes | $	194	1,608
Proceeds from the sale of investment securities available-for-sale | $	27,408	81,983	$ 15,389
Gross realized gains | $	623	1,189	919
Gross realized losses | $	0	0	58
Carrying value of securities pledged | $	$ 144,750	$ 180,478
Number of investment securities held	163	88
State and Municipals, Tax-exempt
Available-for-sale and Held-to-maturity securities
Number of investment securities held	107	38
Number of securities in continuous unrealized loss positions 12 months or longer	2	4
State and Municipals, Taxable
Available-for-sale and Held-to-maturity securities
Number of investment securities held	2	1
Number of securities in continuous unrealized loss positions 12 months or longer		1
Peoples Bank
Available-for-sale and Held-to-maturity securities
Proceeds from the sale of investment securities available-for-sale | $			722
U.S. Treasury securities
Available-for-sale and Held-to-maturity securities
Number of investment securities held		1
U.S. Treasury securities | State and Municipals, Tax-exempt
Available-for-sale and Held-to-maturity securities
Number of investment securities held	2
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%
Number of investment securities held	22	12
Number of securities in continuous unrealized loss positions 12 months or longer	9	7
Other-than-temporary impairments recognized | $	$ 0	$ 0	$ 0
Mortgage-backed Securities, Issued by Government Agencies | United States
Available-for-sale and Held-to-maturity securities
Number of investment securities held	30	36

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