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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
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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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