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Investment securities - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 Security | Dec. 31, 2012 Security | Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items] |  |  |
Unrealized gains, net | $ 1,826 | $ 4,524 |
Net of deferred income taxes | 984 | 2,331 |
Proceeds from the sale of investment securities available-for-sale | 4,573 | 5,821 | 15,318
Gross realized gains | 163 | 317 | 666
Gross realized losses | 0 | 0 | 0
Income tax provision applicable to net realized gains | 55 | 108 | 226
Carrying value of securities pledged | 202,407 | 150,620 |
Number of investment securities held | 153 | 5 |
Other-than-temporary impairments recognized | 0 |  |
U.S. Government-Sponsored Enterprises [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Maximum percentage of stockholders' equity exceeded for securities of any individual issuer | 10.00% | 10.00% |
Number of investment securities held | 39 | 1 |
Number of securities in continuous unrealized loss positions 12 months or longer | 1 |  |
State and Municipals, Tax-exempt [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Number of investment securities held | 79 |  |
State and Municipals, Taxable [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Number of investment securities held | 16 |  |
Mortgage-backed Securities, Issued by U.S. Government Agencies [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Number of investment securities held | 15 |  |
Corporate Debt Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Number of investment securities held | 1 |  |
U.S. Government Agencies [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Number of investment securities held | 1 |  |
Common Stock [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Number of investment securities held | 2 | 4 |
Number of securities in continuous unrealized loss positions 12 months or longer |  | 1 |
Other-than-temporary impairments recognized |  | $ 0 | $ 78

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