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Investment securities - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 9 Months Ended | 12 Months Ended
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Sep. 30, 2014 Security | Sep. 30, 2013 | Dec. 31, 2013 Security
Schedule of Available-for-sale Securities [Line Items] |  |  |
Carrying value of securities pledged | $ 215,113 |  | $ 202,407
Number of investment securities held | 114 |  | 153
Other-than-temporary impairments recognized | $ 0 | $ 0 |
State and Municipals, Tax-Exempt [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Number of investment securities held | 28 |  | 79
Number of securities in continuous unrealized loss positions 12 months or longer | 9 |  |
State and Municipals, Taxable [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Number of investment securities held | 2 |  | 16
U.S. Government-Sponsored Enterprises State and Municipals [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 | 26 |  | 39
Number of securities in continuous unrealized loss positions 12 months or longer | 7 |  | 1
Mortgage-backed Securities, Issued by U.S. Government Agencies [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Number of investment securities held | 33 |  | 16
Corporate Debt Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Number of investment securities held |  |  | 1
U.S. Treasury Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Number of investment securities held | 25 |  |
Common Stock [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Number of investment securities held |  |  | 2

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- Definition Maximum Percentage Of Stockholders Equity Exceeded For Securities Of Any Individual Issuer + References No definition available. + Details
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- Definition Number Of Investment Securities Owned + References No definition available. + Details
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- Definition Number Of Securities In Continuous Unrealized Loss Position 12 Months Or Longer + References No definition available. + Details
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- Definition The fair value of available-for-sale securities that serve as collateral for borrowings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5086-111524 + Details
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- Definition The amount by which the fair value of an investment in debt securities categorized as Held-to-maturity is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 + Details
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- Details
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