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Investment securities - Amortized Cost and Fair Value of Investment Securities Aggregated by Investment Category (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Available-for-sale and Held-to-maturity securities
Available-for-sale, Amortized Cost	$ 245,289	$ 280,342
Available-for-sale, Gross Unrealized Gains	6,186	5,133
Available-for-sale, Gross Unrealized Losses	93	540
Available-for-sale, Fair Value	251,382	284,935
Held-to-maturity, Amortized Cost	11,262	12,109
Held-to-maturity, Gross Unrealized Gains	803	513
Held-to-maturity, Gross Unrealized Losses		16
Held-to-maturity, Fair Value	12,065	12,606
Mortgage-backed Securities, U.S. Government agencies
Available-for-sale and Held-to-maturity securities
Available-for-sale, Amortized Cost	25,878	31,612
Available-for-sale, Gross Unrealized Gains	189	73
Available-for-sale, Gross Unrealized Losses	13	117
Available-for-sale, Fair Value	26,054	31,568
Held-to-maturity, Amortized Cost	76	84
Held-to-maturity, Gross Unrealized Gains	2	1
Held-to-maturity, Fair Value	78	85
Mortgage-backed Securities, U.S. Government-sponsored enterprises
Available-for-sale and Held-to-maturity securities
Available-for-sale, Amortized Cost	27,316	32,928
Available-for-sale, Gross Unrealized Gains	241	119
Available-for-sale, Gross Unrealized Losses	78	208
Available-for-sale, Fair Value	27,479	32,839
Held-to-maturity, Amortized Cost	4,322	5,160
Held-to-maturity, Gross Unrealized Gains	313	326
Held-to-maturity, Fair Value	4,635	5,486
U.S. Government-sponsored enterprises state and municipals
Available-for-sale and Held-to-maturity securities
Available-for-sale, Amortized Cost	58,307	68,831
Available-for-sale, Gross Unrealized Gains	438	291
Available-for-sale, Gross Unrealized Losses		62
Available-for-sale, Fair Value	58,745	69,060
U.S. Treasury securities
Available-for-sale and Held-to-maturity securities
Available-for-sale, Amortized Cost		10,030
Available-for-sale, Gross Unrealized Losses		31
Available-for-sale, Fair Value		9,999
State and Municipals, Taxable
Available-for-sale and Held-to-maturity securities
Available-for-sale, Amortized Cost	14,767	15,842
Available-for-sale, Gross Unrealized Gains	1,182	735
Available-for-sale, Gross Unrealized Losses		32
Available-for-sale, Fair Value	15,949	16,545
State and Municipals, Tax-exempt
Available-for-sale and Held-to-maturity securities
Available-for-sale, Amortized Cost	119,021	121,099
Available-for-sale, Gross Unrealized Gains	4,136	3,915
Available-for-sale, Gross Unrealized Losses	2	90
Available-for-sale, Fair Value	123,155	124,924
Held-to-maturity, Amortized Cost	6,864	6,865
Held-to-maturity, Gross Unrealized Gains	488	186
Held-to-maturity, Gross Unrealized Losses		16
Held-to-maturity, Fair Value	$ 7,352	$ 7,035

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
-Name Accounting Standards Codification
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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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