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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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Number of securities in continuous unrealized loss position.

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Number Of Securities In Continuous Unrealized Loss Position 12 Months Or Longer

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The fair value of available-for-sale securities that serve as collateral for borrowings.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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