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Investment securities - Amortized Cost and Fair Value of Investment Securities Aggregated by Investment Category (Detail) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
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Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale, Amortized Cost | $ 314,022 | $ 333,294
Available-for-sale, Gross Unrealized Gains | 5,670 | 6,817
Available-for-sale, Gross Unrealized Losses | 902 | 525
Available-for-sale, Fair Value | 318,790 | 339,586
Total Amortized Cost, Held to maturity | 13,626 | 14,665
Held-to-maturity, Gross Unrealized Gains | 531 | 588
Held-to-maturity, Gross Unrealized Losses | 53 | 38
Held-to-maturity, Fair Value | 14,104 | 15,215
State and Municipals Tax Exempt Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total Amortized Cost, Held to maturity | 7,369 | 7,370
Held-to-maturity, Gross Unrealized Gains | 103 | 105
Held-to-maturity, Gross Unrealized Losses | 53 | 38
Held-to-maturity, Fair Value | 7,419 | 7,437
Mortgage-Backed Securities, U.S. Government Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale, Amortized Cost | 32,995 | 37,511
Available-for-sale, Gross Unrealized Gains | 156 | 132
Available-for-sale, Gross Unrealized Losses | 62 | 167
Available-for-sale, Fair Value | 33,089 | 37,476
Total Amortized Cost, Held to maturity | 93 | 100
Held-to-maturity, Gross Unrealized Gains | 1 | 2
Held-to-maturity, Fair Value | 94 | 102
Mortgage-Backed Securities, U.S. Government-Sponsored Enterprises [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale, Amortized Cost | 39,848 | 46,956
Available-for-sale, Gross Unrealized Gains | 250 | 277
Available-for-sale, Gross Unrealized Losses | 170 | 226
Available-for-sale, Fair Value | 39,928 | 47,007
Total Amortized Cost, Held to maturity | 6,164 | 7,195
Held-to-maturity, Gross Unrealized Gains | 427 | 481
Held-to-maturity, Fair Value | 6,591 | 7,676
U.S. Government-Sponsored Enterprises State and Municipals [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale, Amortized Cost | 85,377 | 95,990
Available-for-sale, Gross Unrealized Gains | 490 | 337
Available-for-sale, Gross Unrealized Losses | 5 | 82
Available-for-sale, Fair Value | 85,862 | 96,245
U.S. Treasury Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale, Amortized Cost | 30,631 | 48,393
Available-for-sale, Gross Unrealized Gains | 84 | 157
Available-for-sale, Gross Unrealized Losses | 30 |
Available-for-sale, Fair Value | 30,685 | 48,550
State and Municipals, Taxable [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale, Amortized Cost | 15,930 | 16,490
Available-for-sale, Gross Unrealized Gains | 804 | 943
Available-for-sale, Gross Unrealized Losses | 22 | 26
Available-for-sale, Fair Value | 16,712 | 17,407
State and Municipals, Tax-Exempt [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale, Amortized Cost | 109,241 | 87,954
Available-for-sale, Gross Unrealized Gains | 3,886 | 4,971
Available-for-sale, Gross Unrealized Losses | 613 | 24
Available-for-sale, Fair Value | $ 112,514 | $ 92,901

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- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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