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Investment securities - Fair Value and Unrealized Losses of Investment Securities in Continuous Unrealized Loss Position (Detail) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
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Schedule of Available-for-sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value | $ 78,485 | $ 68,948
Less Than 12 Months, Unrealized Losses | 765 | 449
12 Months or More, Fair Value | 10,454 | 10,921
12 Months or More, Unrealized Losses | 190 | 114
Total, Fair Value | 88,939 | 79,869
Total, Unrealized Losses | 955 | 563
State and Municipals, Taxable [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
12 Months or More, Fair Value | 545 | 544
12 Months or More, Unrealized Losses | 22 | 26
Total, Fair Value | 545 | 544
Total, Unrealized Losses | 22 | 26
State and Municipals, Tax-Exempt [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value | 44,196 | 4,702
Less Than 12 Months, Unrealized Losses | 636 | 23
12 Months or More, Fair Value | 786 | 2,423
12 Months or More, Unrealized Losses | 30 | 39
Total, Fair Value | 44,982 | 7,125
Total, Unrealized Losses | 666 | 62
U.S. Treasury Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value | 10,044 |
Less Than 12 Months, Unrealized Losses | 30 |
Total, Fair Value | 10,044 |
Total, Unrealized Losses | 30 |
U.S. Government-Sponsored Enterprises State and Municipals [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value | 3,003 | 21,228
Less Than 12 Months, Unrealized Losses | 5 | 33
12 Months or More, Fair Value |  | 7,954
12 Months or More, Unrealized Losses |  | 49
Total, Fair Value | 3,003 | 29,182
Total, Unrealized Losses | 5 | 82
Mortgage-Backed Securities, U.S. Government Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value | 7,457 | 20,148
Less Than 12 Months, Unrealized Losses | 26 | 167
12 Months or More, Fair Value | 5,402 |
12 Months or More, Unrealized Losses | 36 |
Total, Fair Value | 12,859 | 20,148
Total, Unrealized Losses | 62 | 167
Mortgage-Backed Securities, U.S. Government-Sponsored Enterprises [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value | 13,785 | 22,870
Less Than 12 Months, Unrealized Losses | 68 | 226
12 Months or More, Fair Value | 3,721 |
12 Months or More, Unrealized Losses | 102 |
Total, Fair Value | 17,506 | 22,870
Total, Unrealized Losses | $ 170 | $ 226

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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 twelve months or longer. + 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)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 Reference 2: 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 + Details
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