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Investment securities - Amortized Cost and Fair Value of Investment Securities Aggregated by Investment Category (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available for sale, Amortized Cost	$ 306,037	$ 296,905
Available for sale, Gross Unrealized Gains	6,996	3,982
Available for sale, Gross Unrealized Losses	710	1,172
Available for sale, Fair Value	312,323	299,715
Held to maturity, Amortized Cost	15,915	17,295
Held to maturity, Gross Unrealized Gains	523	657
Held to maturity, Gross Unrealized Losses	366	777
Held to maturity, Fair Value	16,072	17,175
State and Municipals, Taxable [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available for sale, Amortized Cost	16,577	16,664
Available for sale, Gross Unrealized Gains	605	160
Available for sale, Gross Unrealized Losses	26	126
Available for sale, Fair Value	17,156	16,698
Held to maturity, Amortized Cost
Held to maturity, Gross Unrealized Gains
Held to maturity, Gross Unrealized Losses
Held to maturity, Fair Value
State and Municipals, Tax-Exempt [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available for sale, Amortized Cost	91,891	96,194
Available for sale, Gross Unrealized Gains	4,922	2,267
Available for sale, Gross Unrealized Losses	45	380
Available for sale, Fair Value	96,768	98,081
Held to maturity, Amortized Cost	7,371	7,372
Held to maturity, Gross Unrealized Gains	9	11
Held to maturity, Gross Unrealized Losses	366	777
Held to maturity, Fair Value	7,014	6,606
U.S. Government-Sponsored Enterprises State and Municipals [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available for sale, Amortized Cost	107,600	113,221
Available for sale, Gross Unrealized Gains	339	296
Available for sale, Gross Unrealized Losses	145	472
Available for sale, Fair Value	107,794	113,045
Held to maturity, Amortized Cost
Held to maturity, Gross Unrealized Gains
Held to maturity, Gross Unrealized Losses
Held to maturity, Fair Value
Corporate Debt Securities [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available for sale, Amortized Cost		4,433
Available for sale, Gross Unrealized Gains		32
Available for sale, Gross Unrealized Losses		78
Available for sale, Fair Value		4,387
Held to maturity, Amortized Cost
Held to maturity, Gross Unrealized Gains
Held to maturity, Gross Unrealized Losses
Held to maturity, Fair Value
Mortgage-Backed Securities, U.S. Government Agencies [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available for sale, Amortized Cost	35,192	20,179
Available for sale, Gross Unrealized Gains	102	113
Available for sale, Gross Unrealized Losses	224	63
Available for sale, Fair Value	35,070	20,229
Held to maturity, Amortized Cost	108	117
Held to maturity, Gross Unrealized Gains	1	2
Held to maturity, Gross Unrealized Losses
Held to maturity, Fair Value	109	119
Mortgage-Backed Securities, U.S. Government-Sponsored Enterprises [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available for sale, Amortized Cost	54,278	45,251
Available for sale, Gross Unrealized Gains	791	763
Available for sale, Gross Unrealized Losses	264	40
Available for sale, Fair Value	54,805	45,974
Held to maturity, Amortized Cost	8,436	9,806
Held to maturity, Gross Unrealized Gains	513	644
Held to maturity, Gross Unrealized Losses
Held to maturity, Fair Value	8,949	10,450
Common Stock [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available for sale, Amortized Cost	309	756
Available for sale, Gross Unrealized Gains	237	351
Available for sale, Gross Unrealized Losses	5	10
Available for sale, Fair Value	541	1,097
Held to maturity, Amortized Cost
Held to maturity, Gross Unrealized Gains
Held to maturity, Gross Unrealized Losses
Held to maturity, Fair Value
U.S. Government Agencies [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available for sale, Amortized Cost	190	207
Available for sale, Gross Unrealized Gains
Available for sale, Gross Unrealized Losses	1	3
Available for sale, Fair Value	$ 189	$ 204

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

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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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