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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	Dec. 31, 2013	Dec. 31, 2012
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available for Sale, Amortized Cost	$ 296,905	$ 154,536
Available for Sale, Gross Unrealized Gains	3,982	6,868
Available for Sale, Gross Unrealized Losses	1,172	13
Available for Sale, Fair Value	299,715	161,391
Held to Maturity, Amortized Cost	17,295	15,902
Held to Maturity, Gross Unrealized Gains	657	872
Held to Maturity, Gross Unrealized Losses	777
Held to Maturity, Fair Value	17,175	16,774
State and Municipals, Tax-exempt [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available for Sale, Amortized Cost	96,194	53,846
Available for Sale, Gross Unrealized Gains	2,267	4,991
Available for Sale, Gross Unrealized Losses	380
Available for Sale, Fair Value	98,081	58,837
Held to Maturity, Amortized Cost	7,372	1,083
Held to Maturity, Gross Unrealized Gains	11	16
Held to Maturity, Gross Unrealized Losses	777
Held to Maturity, Fair Value	6,606	1,099
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, Fair Value
U.S. Government Agencies [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available for Sale, Amortized Cost	207
Available for Sale, Gross Unrealized Gains
Available for Sale, Gross Unrealized Losses	3
Available for Sale, Fair Value	204
Held to Maturity, Amortized Cost	117	136
Held to Maturity, Gross Unrealized Gains	2	4
Held to Maturity, Fair Value	119	140
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	45,251	15,962
Available for Sale, Gross Unrealized Gains	763	839
Available for Sale, Gross Unrealized Losses	40
Available for Sale, Fair Value	45,974	16,801
Held to Maturity, Amortized Cost	9,806	14,683
Held to Maturity, Gross Unrealized Gains	644	852
Held to Maturity, Fair Value	10,450	15,535
Common Stock [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available for Sale, Amortized Cost	756	801
Available for Sale, Gross Unrealized Gains	351	281
Available for Sale, Gross Unrealized Losses	10	11
Available for Sale, Fair Value	1,097	1,071
Held to Maturity, Fair Value
U.S. Government-Sponsored Enterprises [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available for Sale, Amortized Cost	113,221	83,927
Available for Sale, Gross Unrealized Gains	296	757
Available for Sale, Gross Unrealized Losses	472	2
Available for Sale, Fair Value	113,045	84,682
State and Municipals, Taxable [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available for Sale, Amortized Cost	16,664
Available for Sale, Gross Unrealized Gains	160
Available for Sale, Gross Unrealized Losses	126
Available for Sale, Fair Value	16,698
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	20,179
Available for Sale, Gross Unrealized Gains	113
Available for Sale, Gross Unrealized Losses	63
Available for Sale, Fair Value	$ 20,229

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

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