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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	Sep. 30, 2014	Dec. 31, 2013
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available for sale, Amortized Cost	$ 346,065	$ 296,905
Available for sale, Gross Unrealized Gains	6,063	3,982
Available for sale, Gross Unrealized Losses	1,303	1,172
Available for sale, Fair Value	350,825	299,715
Held to maturity, Amortized Cost	15,264	17,295
Held to maturity, Gross Unrealized Gains	459	657
Held to maturity, Gross Unrealized Losses	207	777
Held to maturity, Fair Value	15,516	17,175
State and Municipals, Taxable [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available for sale, Amortized Cost	16,534	16,664
Available for sale, Gross Unrealized Gains	727	160
Available for sale, Gross Unrealized Losses	25	126
Available for sale, Fair Value	17,236	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	89,340	96,194
Available for sale, Gross Unrealized Gains	4,782	2,267
Available for sale, Gross Unrealized Losses	16	380
Available for sale, Fair Value	94,106	98,081
Held to maturity, Amortized Cost	7,370	7,372
Held to maturity, Gross Unrealized Gains	14	11
Held to maturity, Gross Unrealized Losses	207	777
Held to maturity, Fair Value	7,177	6,606
U.S. Treasury Securities [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available for sale, Amortized Cost	48,357
Available for sale, Gross Unrealized Gains
Available for sale, Gross Unrealized Losses	296
Available for sale, Fair Value	48,061
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
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	39,677	20,386
Available for sale, Gross Unrealized Gains	121	113
Available for sale, Gross Unrealized Losses	287	66
Available for sale, Fair Value	39,511	20,433
Held to maturity, Amortized Cost	104	117
Held to maturity, Gross Unrealized Gains	2	2
Held to maturity, Gross Unrealized Losses
Held to maturity, Fair Value	106	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	50,863	45,251
Available for sale, Gross Unrealized Gains	247	763
Available for sale, Gross Unrealized Losses	451	40
Available for sale, Fair Value	50,659	45,974
Held to maturity, Amortized Cost	7,790	9,806
Held to maturity, Gross Unrealized Gains	443	644
Held to maturity, Gross Unrealized Losses
Held to maturity, Fair Value	8,233	10,450
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	101,294	113,221
Available for sale, Gross Unrealized Gains	186	296
Available for sale, Gross Unrealized Losses	228	472
Available for sale, Fair Value	101,252	113,045
Common Stock [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available for sale, Amortized Cost		756
Available for sale, Gross Unrealized Gains		351
Available for sale, Gross Unrealized Losses		10
Available for sale, Fair Value		$ 1,097

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

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