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Investment securities - Amortized Cost and Fair Value of Investment Securities Aggregated by Investment Category (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale, Amortized Cost	$ 314,022	$ 333,294
Available-for-sale, Gross Unrealized Gains	5,670	6,817
Available-for-sale, Gross Unrealized Losses	902	525
Available-for-sale, Fair Value	318,790	339,586
Total Amortized Cost, Held to maturity	13,626	14,665
Held-to-maturity, Gross Unrealized Gains	531	588
Held-to-maturity, Gross Unrealized Losses	53	38
Held-to-maturity, Fair Value	14,104	15,215
State and Municipals Tax Exempt Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Total Amortized Cost, Held to maturity	7,369	7,370
Held-to-maturity, Gross Unrealized Gains	103	105
Held-to-maturity, Gross Unrealized Losses	53	38
Held-to-maturity, Fair Value	7,419	7,437
Mortgage-Backed Securities, U.S. Government Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale, Amortized Cost	32,995	37,511
Available-for-sale, Gross Unrealized Gains	156	132
Available-for-sale, Gross Unrealized Losses	62	167
Available-for-sale, Fair Value	33,089	37,476
Total Amortized Cost, Held to maturity	93	100
Held-to-maturity, Gross Unrealized Gains	1	2
Held-to-maturity, Fair Value	94	102
Mortgage-Backed Securities, U.S. Government-Sponsored Enterprises [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale, Amortized Cost	39,848	46,956
Available-for-sale, Gross Unrealized Gains	250	277
Available-for-sale, Gross Unrealized Losses	170	226
Available-for-sale, Fair Value	39,928	47,007
Total Amortized Cost, Held to maturity	6,164	7,195
Held-to-maturity, Gross Unrealized Gains	427	481
Held-to-maturity, Fair Value	6,591	7,676
U.S. Government-Sponsored Enterprises State and Municipals [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale, Amortized Cost	85,377	95,990
Available-for-sale, Gross Unrealized Gains	490	337
Available-for-sale, Gross Unrealized Losses	5	82
Available-for-sale, Fair Value	85,862	96,245
U.S. Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale, Amortized Cost	30,631	48,393
Available-for-sale, Gross Unrealized Gains	84	157
Available-for-sale, Gross Unrealized Losses	30
Available-for-sale, Fair Value	30,685	48,550
State and Municipals, Taxable [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale, Amortized Cost	15,930	16,490
Available-for-sale, Gross Unrealized Gains	804	943
Available-for-sale, Gross Unrealized Losses	22	26
Available-for-sale, Fair Value	16,712	17,407
State and Municipals, Tax-Exempt [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale, Amortized Cost	109,241	87,954
Available-for-sale, Gross Unrealized Gains	3,886	4,971
Available-for-sale, Gross Unrealized Losses	613	24
Available-for-sale, Fair Value	$ 112,514	$ 92,901

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