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Investment securities - Amortized Cost and Fair Value of Investment Securities Aggregated by Investment Category (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
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	$ 339,586
Total Amortized Cost, Held to maturity	12,109	14,665
Held to maturity, Gross Unrealized Gains	513	588
Held to maturity, Gross Unrealized Losses	16	38
Held to maturity, Fair Value	12,606	15,215
State and Municipals Tax Exempt Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Total Amortized Cost, Held to maturity	6,865
Held to maturity, Gross Unrealized Gains	186
Held to maturity, Gross Unrealized Losses	16
Held to maturity, Fair Value	7,035
Mortgage-Backed Securities, U.S. Government Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Amortized Cost	31,612	37,511
Available for sale, Gross Unrealized Gains	73	132
Available for sale, Gross Unrealized Losses	117	167
Available for sale, Fair Value	31,568	37,476
Total Amortized Cost, Held to maturity	84	100
Held to maturity, Gross Unrealized Gains	1	2
Held to maturity, Fair Value	85	102
Mortgage-Backed Securities, U.S. Government-Sponsored Enterprises [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Amortized Cost	32,928	46,956
Available for sale, Gross Unrealized Gains	119	277
Available for sale, Gross Unrealized Losses	208	226
Available for sale, Fair Value	32,839	47,007
Total Amortized Cost, Held to maturity	5,160	7,195
Held to maturity, Gross Unrealized Gains	326	481
Held to maturity, Fair Value	5,486	7,676
U.S. Treasuries [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Amortized Cost	10,030	48,393
Available for sale, Gross Unrealized Gains		157
Available for sale, Gross Unrealized Losses	31
Available for sale, Fair Value	9,999	48,550
U.S. Government-Sponsored Enterprises State and Municipals [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Amortized Cost	68,831	95,990
Available for sale, Gross Unrealized Gains	291	337
Available for sale, Gross Unrealized Losses	62	82
Available for sale, Fair Value	69,060	96,245
Common Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Amortized Cost		333,294
Available for sale, Gross Unrealized Gains		6,817
Available for sale, Gross Unrealized Losses		525
Available for sale, Fair Value		339,586
State and Municipals, Taxable [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Amortized Cost	15,842	16,490
Available for sale, Gross Unrealized Gains	735	943
Available for sale, Gross Unrealized Losses	32	26
Available for sale, Fair Value	16,545	17,407
State and Municipals, Tax-Exempt [Member]
Schedule of Available-for-sale Securities [Line Items]
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
Total Amortized Cost, Held to maturity		7,370
Held to maturity, Gross Unrealized Gains		105
Held to maturity, Gross Unrealized Losses		38
Held to maturity, Fair Value		7,437
State and Municipals, Tax-Exempt [Member] | Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Amortized Cost		87,954
Available for sale, Gross Unrealized Gains		4,971
Available for sale, Gross Unrealized Losses		24
Available for sale, Fair Value		$ 92,901

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

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