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Investment securities - Fair Value and Unrealized Losses of Investment Securities in Continuous Unrealized Loss Position (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
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Schedule of Available-for-sale Securities [Line Items] |  |
Total, Unrealized Losses | $ 1,342 | $ 1,949
Total, Fair Value | 125,280 | 136,431
12 Months or More, Unrealized Losses | 53 | 4
12 Months or More, Fair Value | 3,648 | 3,114
Less Than 12 Months, Unrealized Losses | 1,289 | 1,945
Less Than 12 Months, Fair Value | 121,632 | 133,317
U.S. Government Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Unrealized Losses | 2 | 3
Total, Fair Value | 203 | 204
12 Months or More, Unrealized Losses |  |
12 Months or More, Fair Value |  |
Less Than 12 Months, Unrealized Losses | 2 | 3
Less Than 12 Months, Fair Value | 203 | 204
U.S. Government-Sponsored Enterprises [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Unrealized Losses | 288 | 472
Total, Fair Value | 60,352 | 69,505
12 Months or More, Unrealized Losses | 2 | 4
12 Months or More, Fair Value | 3,102 | 3,114
Less Than 12 Months, Unrealized Losses | 286 | 468
Less Than 12 Months, Fair Value | 57,250 | 66,391
State and Municipals, Taxable [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Unrealized Losses | 35 | 126
Total, Fair Value | 3,646 | 10,621
12 Months or More, Unrealized Losses |  |
12 Months or More, Fair Value |  |
Less Than 12 Months, Unrealized Losses | 35 | 126
Less Than 12 Months, Fair Value | 3,646 | 10,621
State and Municipals, Tax-Exempt [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Unrealized Losses | 594 | 1,157
Total, Fair Value | 27,855 | 36,471
12 Months or More, Unrealized Losses | 51 |
12 Months or More, Fair Value | 546 |
Less Than 12 Months, Unrealized Losses | 543 | 1,157
Less Than 12 Months, Fair Value | 27,309 | 36,471
Corporate Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Unrealized Losses | 69 | 78
Total, Fair Value | 1,094 | 1,095
12 Months or More, Unrealized Losses |  |
12 Months or More, Fair Value |  |
Less Than 12 Months, Unrealized Losses | 69 | 78
Less Than 12 Months, Fair Value | 1,094 | 1,095
Mortgage-backed Securities, Issued by U.S. Government Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Unrealized Losses | 278 | 63
Total, Fair Value | 22,474 | 12,774
12 Months or More, Unrealized Losses |  |
12 Months or More, Fair Value |  |
Less Than 12 Months, Unrealized Losses | 278 | 63
Less Than 12 Months, Fair Value | 22,474 | 12,774
Mortgage-Backed Securities, U.S. Government-Sponsored Enterprises [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Unrealized Losses | 70 | 40
Total, Fair Value | 9,586 | 5,624
12 Months or More, Unrealized Losses |  |
12 Months or More, Fair Value |  |
Less Than 12 Months, Unrealized Losses | 70 | 40
Less Than 12 Months, Fair Value | 9,586 | 5,624
Common Stock [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Unrealized Losses | 6 | 10
Total, Fair Value | 70 | 137
12 Months or More, Unrealized Losses |  |
12 Months or More, Fair Value |  |
Less Than 12 Months, Unrealized Losses | 6 | 10
Less Than 12 Months, Fair Value | $ 70 | $ 137

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- Definition Amount of accumulated pre-tax unrealized loss on investments in available-for-sale securities that have been in a loss position for twelve months or longer impacting investments. + References No definition available. + Details
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- Definition Amount of accumulated pre-tax unrealized loss on investments on securities classified as available-for-sale securities impacting investments. + References No definition available. + Details
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- Definition Amount of accumulated pre-tax unrealized loss on investments in available-for-sale securities that have been in a loss position for less than twelve months impacting investments. + References No definition available. + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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