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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	Mar. 31, 2014	Dec. 31, 2013
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available for Sale, Amortized Cost	$ 297,022	$ 296,905
Available for Sale, Gross Unrealized Gains	6,035	3,982
Available for Sale, Gross Unrealized Losses	831	1,172
Available for Sale, Fair Value	302,226	299,715
Held to Maturity, Amortized Cost	16,607	17,295
Held to Maturity, Gross Unrealized Gains	501	657
Held to Maturity, Gross Unrealized Losses	511	777
Held to Maturity, Fair Value	16,597	17,175
U.S. Government-Sponsored Enterprises [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available for Sale, Amortized Cost	107,912	113,221
Available for Sale, Gross Unrealized Gains	269	296
Available for Sale, Gross Unrealized Losses	288	472
Available for Sale, Fair Value	107,893	113,045
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, Taxable [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available for Sale, Amortized Cost	16,620	16,664
Available for Sale, Gross Unrealized Gains	344	160
Available for Sale, Gross Unrealized Losses	35	126
Available for Sale, Fair Value	16,929	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	93,146	96,194
Available for Sale, Gross Unrealized Gains	4,149	2,267
Available for Sale, Gross Unrealized Losses	83	380
Available for Sale, Fair Value	97,212	98,081
Held to Maturity, Amortized Cost	7,371	7,372
Held to Maturity, Gross Unrealized Gains	15	11
Held to Maturity, Gross Unrealized Losses	511	777
Held to Maturity, Fair Value	6,875	6,606
Corporate Debt Securities [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available for Sale, Amortized Cost	4,405	4,433
Available for Sale, Gross Unrealized Gains	38	32
Available for Sale, Gross Unrealized Losses	69	78
Available for Sale, Fair Value	4,374	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	29,826	20,179
Available for Sale, Gross Unrealized Gains	107	113
Available for Sale, Gross Unrealized Losses	278	63
Available for Sale, Fair Value	29,655	20,229
Held to Maturity, Amortized Cost	112	117
Held to Maturity, Gross Unrealized Gains	2	2
Held to Maturity, Gross Unrealized Losses
Held to Maturity, Fair Value	114	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	44,212	45,251
Available for Sale, Gross Unrealized Gains	725	763
Available for Sale, Gross Unrealized Losses	70	40
Available for Sale, Fair Value	44,867	45,974
Held to Maturity, Amortized Cost	9,124	9,806
Held to Maturity, Gross Unrealized Gains	484	644
Held to Maturity, Gross Unrealized Losses
Held to Maturity, Fair Value	9,608	10,450
Common Stock [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available for Sale, Amortized Cost	696	756
Available for Sale, Gross Unrealized Gains	403	351
Available for Sale, Gross Unrealized Losses	6	10
Available for Sale, Fair Value	1,093	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	205	207
Available for Sale, Gross Unrealized Gains
Available for Sale, Gross Unrealized Losses	2	3
Available for Sale, Fair Value	$ 203	$ 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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