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Fair value of financial instruments - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (Recurring Fair Value Measurements [Member], USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
U.S. Government-agencies | $ 204 |
U.S. Government-sponsored enterprises | 113,045 | 84,682
State and Municipals: |  |
Taxable | 16,698 |
Tax-exempt | 98,081 | 58,837
Corporate debt securities | 4,387 |
Mortgage-backed securities: |  |
U.S. Government agencies | 20,229 |
U.S. Government-sponsored enterprises | 45,974 | 16,801
Common equity securities | 1,097 | 1,071
Total | 299,715 | 161,391
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
U.S. Government-agencies |  |
U.S. Government-sponsored enterprises |  |
State and Municipals: |  |
Taxable |  |
Tax-exempt |  |
Corporate debt securities |  |
Mortgage-backed securities: |  |
U.S. Government agencies |  |
U.S. Government-sponsored enterprises |  |
Common equity securities | 1,097 | 1,071
Total | 1,097 | 1,071
Significant Observable Inputs (Level 2) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
U.S. Government-agencies | 204 |
U.S. Government-sponsored enterprises | 113,045 | 84,682
State and Municipals: |  |
Taxable | 16,698 |
Tax-exempt | 98,081 | 58,837
Corporate debt securities | 4,387 |
Mortgage-backed securities: |  |
U.S. Government agencies | 20,229 |
U.S. Government-sponsored enterprises | 45,974 | 16,801
Total | 298,618 | 160,320
Significant Unobservable Inputs (Level 3) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
U.S. Government-agencies |  |
U.S. Government-sponsored enterprises |  |
State and Municipals: |  |
Taxable |  |
Tax-exempt |  |
Corporate debt securities |  |
Mortgage-backed securities: |  |
U.S. Government agencies |  |
U.S. Government-sponsored enterprises |  |
Common equity securities |  |
Total |  |

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- Definition Fair value disclosure of Common equity securities at the end of the period. + References No definition available. + Details
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- Definition Fair value disclosure of corporate debt securities. + References No definition available. + Details
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- Details
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- Definition Fair value disclosure of U. S. government-sponsored agencies securities mortgaged backed securities at the end of the period. + References No definition available. + Details
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- Definition Fair value disclosure of taxable state and municipals securities. + References No definition available. + Details
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- Definition Fair value disclosure of tax-exempt state and municipals securities. + References No definition available. + Details
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- Definition United States Government Agencies Fair Value Disclosure + References No definition available. + Details
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- Definition Fair value disclosure of U. S. government-sponsored agencies securities at the end of the period. + References No definition available. + Details
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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a recurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
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- Definition Fair value of securitized, pay-through debt securities collateralized by real estate mortgage loans classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Mortgage-Backed Securities -URI http://asc.fasb.org/extlink&oid=6517959 + Details
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