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Investment securities - Amortized Cost and Fair Value of Investment Securities Aggregated by Investment Category (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Available-for-sale and Held-to-maturity securities
Available-for-sale, Amortized Cost	$ 258,829	$ 280,342
Available-for-sale, Gross Unrealized Gains	5,549	5,133
Available-for-sale, Gross Unrealized Losses	203	540
Available-for-sale, Fair Value	264,175	284,935
Held-to-maturity, Amortized Cost	11,681	12,109
Held-to-maturity, Gross Unrealized Gains	642	513
Held-to-maturity, Gross Unrealized Losses	1	16
Held-to-maturity, Fair Value	12,322	12,606
Mortgage-backed Securities, U.S. Government agencies
Available-for-sale and Held-to-maturity securities
Available-for-sale, Amortized Cost	29,156	31,612
Available-for-sale, Gross Unrealized Gains	97	73
Available-for-sale, Gross Unrealized Losses	45	117
Available-for-sale, Fair Value	29,208	31,568
Held-to-maturity, Amortized Cost	81	84
Held-to-maturity, Gross Unrealized Gains	1	1
Held-to-maturity, Fair Value	82	85
Mortgage-backed Securities, U.S. Government-sponsored enterprises
Available-for-sale and Held-to-maturity securities
Available-for-sale, Amortized Cost	30,078	32,928
Available-for-sale, Gross Unrealized Gains	145	119
Available-for-sale, Gross Unrealized Losses	107	208
Available-for-sale, Fair Value	30,116	32,839
Held-to-maturity, Amortized Cost	4,736	5,160
Held-to-maturity, Gross Unrealized Gains	308	326
Held-to-maturity, Fair Value	5,044	5,486
U.S. Government-sponsored enterprises state and municipals
Available-for-sale and Held-to-maturity securities
Available-for-sale, Amortized Cost	64,562	68,831
Available-for-sale, Gross Unrealized Gains	499	291
Available-for-sale, Gross Unrealized Losses	7	62
Available-for-sale, Fair Value	65,054	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	14,801	15,842
Available-for-sale, Gross Unrealized Gains	993	735
Available-for-sale, Gross Unrealized Losses	11	32
Available-for-sale, Fair Value	15,783	16,545
State and Municipals, Tax-exempt
Available-for-sale and Held-to-maturity securities
Available-for-sale, Amortized Cost	120,232	121,099
Available-for-sale, Gross Unrealized Gains	3,815	3,915
Available-for-sale, Gross Unrealized Losses	33	90
Available-for-sale, Fair Value	124,014	124,924
Held-to-maturity, Amortized Cost	6,864	6,865
Held-to-maturity, Gross Unrealized Gains	333	186
Held-to-maturity, Gross Unrealized Losses	1	16
Held-to-maturity, Fair Value	$ 7,196	$ 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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