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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 | Dec. 31, 2013 | Dec. 31, 2012
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Schedule of Available-for-sale Securities [Line Items] |  |
Total, Unrealized Losses | $ 1,949 | $ 13
Total, Fair Value | 136,431 | 3,358
12 Months or More, Unrealized Losses | 4 | 2
12 Months or More, Fair Value | 3,114 | 48
Less than 12 Months, Unrealized Losses | 1,945 | 11
Less than 12 Months, Fair Value | 133,317 | 3,310
U.S. Government Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Unrealized Losses | 3 |
Total, Fair Value | 204 |
12 Months or More, Unrealized Losses |  |
12 Months or More, Fair Value |  |
Less than 12 Months, Unrealized Losses | 3 |
Less than 12 Months, Fair Value | 204 |
U.S. Government-Sponsored Enterprises [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Unrealized Losses | 472 | 2
Total, Fair Value | 69,505 | 3,169
12 Months or More, Unrealized Losses | 4 |
12 Months or More, Fair Value | 3,114 |
Less than 12 Months, Unrealized Losses | 468 | 2
Less than 12 Months, Fair Value | 66,391 | 3,169
State and Municipals, Taxable [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Unrealized Losses | 126 |
Total, Fair Value | 10,621 |
12 Months or More, Unrealized Losses |  |
12 Months or More, Fair Value |  |
Less than 12 Months, Unrealized Losses | 126 |
Less than 12 Months, Fair Value | 10,621 |
State and Municipals, Tax-exempt [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Unrealized Losses | 1,157 |
Total, Fair Value | 36,471 |
12 Months or More, Unrealized Losses |  |
12 Months or More, Fair Value |  |
Less than 12 Months, Unrealized Losses | 1,157 |
Less than 12 Months, Fair Value | 36,471 |
Corporate Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Unrealized Losses | 78 |
Total, Fair Value | 1,095 |
12 Months or More, Unrealized Losses |  |
12 Months or More, Fair Value |  |
Less than 12 Months, Unrealized Losses | 78 |
Less than 12 Months, Fair Value | 1,095 |
Mortgage-backed Securities, Issued by U.S. Government Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Unrealized Losses | 63 |
Total, Fair Value | 12,774 |
12 Months or More, Unrealized Losses |  |
12 Months or More, Fair Value |  |
Less than 12 Months, Unrealized Losses | 63 |
Less than 12 Months, Fair Value | 12,774 |
Mortgage-backed Securities, U.S. Government-Sponsored Enterprises [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Unrealized Losses | 40 |
Total, Fair Value | 5,624 |
12 Months or More, Unrealized Losses |  |
12 Months or More, Fair Value |  |
Less than 12 Months, Unrealized Losses | 40 |
Less than 12 Months, Fair Value | 5,624 |
Common Stock [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Unrealized Losses | 10 | 11
Total, Fair Value | 137 | 189
12 Months or More, Unrealized Losses |  | 2
12 Months or More, Fair Value |  | 48
Less than 12 Months, Unrealized Losses | 10 | 9
Less than 12 Months, Fair Value | $ 137 | $ 141

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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 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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