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Investment securities - Additional Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) security	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Available-for-sale and Held-to-maturity securities
Unrealized gains, net | $	$ 2,568	$ 977
Net of deferred income taxes | $	683	260
Proceeds from sale of available-for-sale investment securities | $	$ 0	0	$ 27,408
Gross realized gains | $			623
Gross realized losses | $			0
Number of investment securities held	187
Other-than-temporary impairments recognized | $	$ 0	$ 0	$ 0
State and Municipals, Tax-exempt
Available-for-sale and Held-to-maturity securities
Number of investment securities held	104
Number of securities in continuous unrealized loss positions 12 months or longer	88
U.S. Treasuries
Available-for-sale and Held-to-maturity securities
Number of securities in continuous unrealized loss positions 12 months or longer	7
U.S. Treasuries | State and Municipals, Tax-exempt
Available-for-sale and Held-to-maturity securities
Number of investment securities held	8
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	37
Number of securities in continuous unrealized loss positions 12 months or longer	35
Mortgage-backed Securities, Issued by Government Agencies | United States
Available-for-sale and Held-to-maturity securities
Number of investment securities held	38
Mortgage-backed Securities, U.S. Government-sponsored enterprises
Available-for-sale and Held-to-maturity securities
Number of securities in continuous unrealized loss positions 12 months or longer	33

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- Definition

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

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The net unrealized gain or (loss) on available-for-sale securities which is net of deferred income taxes.

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The maximum percentage of stockholders' equity exceeded for securities of any individual issuer.

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The number of investment securities held.

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

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Amount of realized gain on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of realized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount, before tax, of other-than-temporary impairment (OTTI) on investment in debt security measured at amortized cost (held-to-maturity), recognized in earnings and other comprehensive income (OCI).

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Amount of cash inflow from sale of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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