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Investment securities - Amortized Cost and Fair Value of Investment Securities Aggregated by Investment Category (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Available-for-sale and Held-to-maturity securities
Available-for-sale, Amortized Cost	$ 254,764	$ 258,857
Available-for-sale, Gross Unrealized Gains	3,080	3,050
Available-for-sale, Gross Unrealized Losses	1,070	2,497
Available-for-sale, Fair Value	256,774	259,410
Held-to-maturity, Amortized Cost	9,868	10,517
Held-to-maturity, Gross Unrealized Gains	356	264
Held-to-maturity, Gross Unrealized Losses	3	67
Held-to-maturity, Fair value	10,221	10,714
Mortgage-backed Securities, U.S. Government agencies
Available-for-sale and Held-to-maturity securities
Available-for-sale, Amortized Cost	17,576	21,041
Available-for-sale, Gross Unrealized Gains	31	48
Available-for-sale, Gross Unrealized Losses	29	47
Available-for-sale, Fair Value	17,578	21,042
Held-to-maturity, Amortized Cost	61	68
Held-to-maturity, Gross Unrealized Gains		1
Held-to-maturity, Fair value	61	69
Mortgage-backed Securities, U.S. Government-sponsored enterprises
Available-for-sale and Held-to-maturity securities
Available-for-sale, Amortized Cost	18,280	22,303
Available-for-sale, Gross Unrealized Gains	39	48
Available-for-sale, Gross Unrealized Losses	111	159
Available-for-sale, Fair Value	18,208	22,192
Held-to-maturity, Amortized Cost	2,947	3,587
Held-to-maturity, Gross Unrealized Gains	193	191
Held-to-maturity, Fair value	3,140	3,778
U.S. Government-sponsored enterprises state and municipals
Available-for-sale and Held-to-maturity securities
Available-for-sale, Amortized Cost	81,495	82,314
Available-for-sale, Gross Unrealized Gains	96	79
Available-for-sale, Gross Unrealized Losses	847	1,480
Available-for-sale, Fair Value	80,744	80,913
U.S. Treasuries
Available-for-sale and Held-to-maturity securities
Available-for-sale, Amortized Cost	20,047	7,570
Available-for-sale, Gross Unrealized Gains	56
Available-for-sale, Gross Unrealized Losses	23	132
Available-for-sale, Fair Value	20,080	7,438
State and Municipals, Taxable
Available-for-sale and Held-to-maturity securities
Available-for-sale, Amortized Cost	14,629	14,698
Available-for-sale, Gross Unrealized Gains	667	566
Available-for-sale, Gross Unrealized Losses	1	39
Available-for-sale, Fair Value	15,295	15,225
State and Municipals, Tax-exempt
Available-for-sale and Held-to-maturity securities
Available-for-sale, Amortized Cost	102,737	110,931
Available-for-sale, Gross Unrealized Gains	2,191	2,309
Available-for-sale, Gross Unrealized Losses	59	640
Available-for-sale, Fair Value	104,869	112,600
Held-to-maturity, Amortized Cost	6,860	6,862
Held-to-maturity, Gross Unrealized Gains	163	72
Held-to-maturity, Gross Unrealized Losses	3	67
Held-to-maturity, Fair value	$ 7,020	$ 6,867

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

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