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Investment securities - Amortized Cost and Fair Value of Investment Securities Aggregated by Investment Category (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Available-for-sale and Held-to-maturity securities
Available-for-sale, Amortized Cost	$ 273,785	$ 258,857
Available-for-sale, Gross Unrealized Gains	1,669	3,050
Available-for-sale, Gross Unrealized Losses	2,906	2,497
Available-for-sale, Fair Value	272,548	259,410
Held-to-maturity, Amortized Cost	9,274	10,517
Held-to-maturity, Gross Unrealized Gains	290	264
Held-to-maturity, Gross Unrealized Losses	17	67
Held-to-maturity, Fair value	9,547	10,714
State and Municipals Tax-exempt Bonds
Available-for-sale and Held-to-maturity securities
Held-to-maturity, Amortized Cost	6,859
Held-to-maturity, Gross Unrealized Gains	152
Held-to-maturity, Gross Unrealized Losses	13
Held-to-maturity, Fair value	6,998
Mortgage-backed Securities, U.S. Government agencies
Available-for-sale and Held-to-maturity securities
Available-for-sale, Amortized Cost	14,517	21,041
Available-for-sale, Gross Unrealized Gains	2	48
Available-for-sale, Gross Unrealized Losses	85	47
Available-for-sale, Fair Value	14,434	21,042
Held-to-maturity, Amortized Cost	54	68
Held-to-maturity, Gross Unrealized Gains		1
Held-to-maturity, Fair value	54	69
Mortgage-backed Securities, U.S. Government-sponsored enterprises
Available-for-sale and Held-to-maturity securities
Available-for-sale, Amortized Cost	19,752	22,303
Available-for-sale, Gross Unrealized Gains	10	48
Available-for-sale, Gross Unrealized Losses	231	159
Available-for-sale, Fair Value	19,531	22,192
Held-to-maturity, Amortized Cost	2,361	3,587
Held-to-maturity, Gross Unrealized Gains	138	191
Held-to-maturity, Gross Unrealized Losses	4
Held-to-maturity, Fair value	2,495	3,778
Commercial mortgage-backed Securities, U.S. Government-sponsored enterprises
Available-for-sale and Held-to-maturity securities
Available-for-sale, Amortized Cost	6,315
Available-for-sale, Gross Unrealized Losses	120
Available-for-sale, Fair Value	6,195
U.S. Government-sponsored enterprises state and municipals
Available-for-sale and Held-to-maturity securities
Available-for-sale, Amortized Cost	95,358	82,314
Available-for-sale, Gross Unrealized Gains	30	79
Available-for-sale, Gross Unrealized Losses	1,740	1,480
Available-for-sale, Fair Value	93,648	80,913
U.S. Treasuries
Available-for-sale and Held-to-maturity securities
Available-for-sale, Amortized Cost	20,042	7,570
Available-for-sale, Gross Unrealized Losses	228	132
Available-for-sale, Fair Value	19,814	7,438
Common equity securities
Available-for-sale and Held-to-maturity securities
Available-for-sale, Amortized Cost	43
Available-for-sale, Gross Unrealized Gains	3
Available-for-sale, Fair Value	46
State and Municipals, Taxable
Available-for-sale and Held-to-maturity securities
Available-for-sale, Amortized Cost	14,559	14,698
Available-for-sale, Gross Unrealized Gains	488	566
Available-for-sale, Gross Unrealized Losses		39
Available-for-sale, Fair Value	15,047	15,225
State and Municipals, Tax-exempt
Available-for-sale and Held-to-maturity securities
Available-for-sale, Amortized Cost	103,199
Available-for-sale, Gross Unrealized Gains	1,136
Available-for-sale, Gross Unrealized Losses	502
Available-for-sale, Fair Value	$ 103,833
Held-to-maturity, Amortized Cost		6,862
Held-to-maturity, Gross Unrealized Gains		72
Held-to-maturity, Gross Unrealized Losses		67
Held-to-maturity, Fair value		6,867
State and Municipals, Tax-exempt | Corporate bonds
Available-for-sale and Held-to-maturity securities
Available-for-sale, Amortized Cost		110,931
Available-for-sale, Gross Unrealized Gains		2,309
Available-for-sale, Gross Unrealized Losses		640
Available-for-sale, Fair Value		$ 112,600

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

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