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Investment securities - Amortized Cost and Fair Value of Investment Securities Aggregated by Investment Category (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Available-for-sale and Held-to-maturity securities
Available-for-sale, Amortized Cost	$ 257,508	$ 258,857
Available-for-sale, Gross Unrealized Gains	2,839	3,050
Available-for-sale, Gross Unrealized Losses	1,209	2,497
Available-for-sale, Fair Value	259,138	259,410
Held-to-maturity, Amortized Cost	9,564	10,517
Held-to-maturity, Gross Unrealized Gains	350	264
Held-to-maturity, Gross Unrealized Losses	2	67
Held-to-maturity, Fair value	9,912	10,714
Mortgage-backed Securities, U.S. Government agencies
Available-for-sale and Held-to-maturity securities
Available-for-sale, Amortized Cost	16,045	21,041
Available-for-sale, Gross Unrealized Gains	21	48
Available-for-sale, Gross Unrealized Losses	33	47
Available-for-sale, Fair Value	16,033	21,042
Held-to-maturity, Amortized Cost	58	68
Held-to-maturity, Gross Unrealized Gains		1
Held-to-maturity, Fair value	58	69
Mortgage-backed Securities, U.S. Government-sponsored enterprises
Available-for-sale and Held-to-maturity securities
Available-for-sale, Amortized Cost	16,492	22,303
Available-for-sale, Gross Unrealized Gains	29	48
Available-for-sale, Gross Unrealized Losses	95	159
Available-for-sale, Fair Value	16,426	22,192
Held-to-maturity, Amortized Cost	2,647	3,587
Held-to-maturity, Gross Unrealized Gains	165	191
Held-to-maturity, Fair value	2,812	3,778
Commercial mortgage-backed Securities, U.S. Government-sponsored enterprises
Available-for-sale and Held-to-maturity securities
Available-for-sale, Amortized Cost	6,326
Available-for-sale, Gross Unrealized Losses	85
Available-for-sale, Fair Value	6,241
U.S. Government-sponsored enterprises state and municipals
Available-for-sale and Held-to-maturity securities
Available-for-sale, Amortized Cost	85,482	82,314
Available-for-sale, Gross Unrealized Gains	83	79
Available-for-sale, Gross Unrealized Losses	915	1,480
Available-for-sale, Fair Value	84,650	80,913
U.S. Treasuries
Available-for-sale and Held-to-maturity securities
Available-for-sale, Amortized Cost	20,045	7,570
Available-for-sale, Gross Unrealized Gains	29
Available-for-sale, Gross Unrealized Losses	28	132
Available-for-sale, Fair Value	20,046	7,438
Common Stock
Available-for-sale and Held-to-maturity securities
Available-for-sale, Amortized Cost	30
Available-for-sale, Fair Value	30
State and Municipals, Taxable
Available-for-sale and Held-to-maturity securities
Available-for-sale, Amortized Cost	14,594	14,698
Available-for-sale, Gross Unrealized Gains	615	566
Available-for-sale, Gross Unrealized Losses	2	39
Available-for-sale, Fair Value	15,207	15,225
State and Municipals, Tax-exempt
Available-for-sale and Held-to-maturity securities
Available-for-sale, Amortized Cost	98,494	110,931
Available-for-sale, Gross Unrealized Gains	2,062	2,309
Available-for-sale, Gross Unrealized Losses	51	640
Available-for-sale, Fair Value	100,505	112,600
Held-to-maturity, Amortized Cost	6,859	6,862
Held-to-maturity, Gross Unrealized Gains	185	72
Held-to-maturity, Gross Unrealized Losses	2	67
Held-to-maturity, Fair value	$ 7,042	$ 6,867

X

- Definition

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

+ References

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-Publisher FASB
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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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