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Investment securities - Amortized Cost and Fair Value of Investment Securities Aggregated by Investment Category (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Available-for-sale and Held-to-maturity securities
Available-for-sale, Amortized Cost	$ 258,857
Available-for-sale, Gross Unrealized Gains	3,050
Available-for-sale, Gross Unrealized Losses	2,497
Available-for-sale, Fair Value	259,410
Held-to-maturity, Amortized Cost	10,517	$ 12,109
Held-to-maturity, Gross Unrealized Gains	264	513
Held-to-maturity, Gross Unrealized Losses	67	16
Held-to-maturity, Fair value	10,714	12,606
State and Municipals Tax-exempt Bonds
Available-for-sale and Held-to-maturity securities
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
Mortgage-backed Securities, U.S. Government agencies
Available-for-sale and Held-to-maturity securities
Available-for-sale, Amortized Cost	21,041	31,612
Available-for-sale, Gross Unrealized Gains	48	73
Available-for-sale, Gross Unrealized Losses	47	117
Available-for-sale, Fair Value	21,042	31,568
Held-to-maturity, Amortized Cost	68	84
Held-to-maturity, Gross Unrealized Gains	1	1
Held-to-maturity, Fair value	69	85
Mortgage-backed Securities, U.S. Government-sponsored enterprises
Available-for-sale and Held-to-maturity securities
Available-for-sale, Amortized Cost	22,303	32,928
Available-for-sale, Gross Unrealized Gains	48	119
Available-for-sale, Gross Unrealized Losses	159	208
Available-for-sale, Fair Value	22,192	32,839
Held-to-maturity, Amortized Cost	3,587	5,160
Held-to-maturity, Gross Unrealized Gains	191	326
Held-to-maturity, Fair value	3,778	5,486
U.S. Government-sponsored enterprises state and municipals
Available-for-sale and Held-to-maturity securities
Available-for-sale, Amortized Cost	82,314	68,831
Available-for-sale, Gross Unrealized Gains	79	291
Available-for-sale, Gross Unrealized Losses	1,480	62
Available-for-sale, Fair Value	80,913	69,060
U.S. Treasury securities
Available-for-sale and Held-to-maturity securities
Available-for-sale, Amortized Cost	7,570	10,030
Available-for-sale, Gross Unrealized Losses	132	31
Available-for-sale, Fair Value	7,438	9,999
Common Stock
Available-for-sale and Held-to-maturity securities
Available-for-sale, Amortized Cost		280,342
Available-for-sale, Gross Unrealized Gains		5,133
Available-for-sale, Gross Unrealized Losses		540
Available-for-sale, Fair Value		284,935
State and Municipals, Taxable
Available-for-sale and Held-to-maturity securities
Available-for-sale, Amortized Cost	14,698	15,842
Available-for-sale, Gross Unrealized Gains	566	735
Available-for-sale, Gross Unrealized Losses	39	32
Available-for-sale, Fair Value	15,225	16,545
State and Municipals, Tax-exempt
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
Held-to-maturity, Amortized Cost		6,865
Held-to-maturity, Gross Unrealized Gains		186
Held-to-maturity, Gross Unrealized Losses		16
Held-to-maturity, Fair value		7,035
State and Municipals, Tax-exempt | Corporate Debt Securities
Available-for-sale and Held-to-maturity securities
Available-for-sale, Amortized Cost		121,099
Available-for-sale, Gross Unrealized Gains		3,915
Available-for-sale, Gross Unrealized Losses		90
Available-for-sale, Fair Value		$ 124,924

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

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