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Investment securities - Additional Information (Detail) |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jun. 30, 2015 USD ($) | Dec. 31, 2014 USD ($) | Jun. 30, 2015 USD ($) | Jun. 30, 2014 USD ($) | Jun. 30, 2015 USD ($) Security | Jun. 30, 2014 USD ($) | Dec. 31, 2014 USD ($) Security
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Carrying value of securities pledged | $ | $ 191,687,000 | $ 216,192,000 | $ 191,687,000 |  | $ 191,687,000 |  | $ 216,192,000
Number of investment securities held |  |  |  |  | 110 |  | 52
State and Municipals, Tax-Exempt [Member] |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Number of investment securities held |  |  |  |  | 84 |  | 16
Number of securities in continuous unrealized loss positions 12 months or longer |  |  |  |  | 3 |  | 4
State and Municipals, Taxable [Member] |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Number of investment securities held |  |  |  |  | 1 |  | 1
Number of securities in continuous unrealized loss positions 12 months or longer |  |  |  |  | 1 |  | 1
Credit Concentration Risk [Member] | Stockholders' Equity, Total [Member] | Us Government Agency And Sponsored Enterprises [Member] | Greater Than [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% |  |  |  |  |
U.S. Government-Sponsored Enterprises State and Municipals [Member] |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Number of investment securities held |  |  |  |  | 1 |  | 9
Number of securities in continuous unrealized loss positions 12 months or longer |  |  |  |  |  |  | 2
Other-than-temporary impairments recognized | $ |  |  | $ 0 | $ 0 | $ 0 | $ 0 |
Mortgage-Backed Securities, U.S. Government-Sponsored Enterprises [Member] |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Number of investment securities held |  |  |  |  | 22 |  | 26
Number of securities in continuous unrealized loss positions 12 months or longer |  |  |  |  | 6 |  |
U.S. Treasury Securities [Member] |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Number of investment securities held |  |  |  |  | 2 |  |

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