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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 | Sep. 30, 2014 | Dec. 31, 2013
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Schedule of Available-for-sale Securities [Line Items] |  |
Total, Unrealized Losses | $ 1,510 | $ 1,949
Total, Fair Value | 172,290 | 136,431
12 Months or More, Fair Value | 25,716 | 3,114
Less Than 12 Months, Unrealized Losses | 1,168 | 1,945
Less Than 12 Months, Fair Value | 146,574 | 133,317
State and Municipals, Taxable [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Unrealized Losses | 25 | 126
Total, Fair Value | 1,599 | 10,621
12 Months or More, Fair Value |  |
Less Than 12 Months, Unrealized Losses | 25 | 126
Less Than 12 Months, Fair Value | 1,599 | 10,621
State and Municipals, Tax-Exempt [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Unrealized Losses | 223 | 1,157
Total, Fair Value | 13,193 | 36,471
12 Months or More, Fair Value | 4,776 |
Less Than 12 Months, Unrealized Losses | 35 | 1,157
Less Than 12 Months, Fair Value | 8,417 | 36,471
U.S. Treasury Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Unrealized Losses | 296 |
Total, Fair Value | 48,061 |
12 Months or More, Fair Value |  |
Less Than 12 Months, Unrealized Losses | 296 |
Less Than 12 Months, Fair Value | 48,061 |
U.S. Government-Sponsored Enterprises State and Municipals [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Unrealized Losses | 228 | 472
Total, Fair Value | 53,589 | 69,505
12 Months or More, Fair Value | 20,940 | 3,114
Less Than 12 Months, Unrealized Losses | 74 | 468
Less Than 12 Months, Fair Value | 32,649 | 66,391
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, 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 | 287 | 66
Total, Fair Value | 26,466 | 12,978
12 Months or More, Fair Value |  |
Less Than 12 Months, Unrealized Losses | 287 | 66
Less Than 12 Months, Fair Value | 26,466 | 12,978
Mortgage-Backed Securities, U.S. Government-Sponsored Enterprises [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Unrealized Losses | 451 | 40
Total, Fair Value | 29,382 | 5,624
12 Months or More, Fair Value |  |
Less Than 12 Months, Unrealized Losses | 451 | 40
Less Than 12 Months, Fair Value | 29,382 | 5,624
Common Stock [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Unrealized Losses |  | 10
Total, Fair Value |  | 137
12 Months or More, Fair Value |  |
Less Than 12 Months, Unrealized Losses |  | 10
Less Than 12 Months, Fair Value |  | $ 137

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + 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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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for less than twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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