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Investment securities - Additional Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) security	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Available-for-sale and Held-to-maturity securities
Unrealized gains, net | $	$ 977	$ 360
Net of deferred income taxes | $	260	193
Proceeds from the sale of investment securities available-for-sale | $	0	27,408	$ 81,983
Gross realized gains | $		623	1,189
Gross realized losses | $		0	0
Gross realized gains or losses | $	0	623	1,189
Carrying value of securities pledged | $	$ 163,936	$ 144,750
Number of investment securities held	186
State and Municipals, Tax-exempt
Available-for-sale and Held-to-maturity securities
Number of investment securities held	103
Number of securities in continuous unrealized loss positions 12 months or longer	7
State and Municipals, Taxable
Available-for-sale and Held-to-maturity securities
Number of investment securities held	1
U.S. Treasuries
Available-for-sale and Held-to-maturity securities
Number of securities in continuous unrealized loss positions 12 months or longer	1
U.S. Treasuries | State and Municipals, Tax-exempt
Available-for-sale and Held-to-maturity securities
Number of investment securities held	7
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%	10.00%
Number of investment securities held	35
Number of securities in continuous unrealized loss positions 12 months or longer	20
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	40

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The net unrealized gain or (loss) on available-for-sale securities.

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Number of securities in continuous unrealized loss position for more than 12 months.

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a)
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