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Fair Value Disclosures - Summary of Assets Measured at Estimated Fair Value on Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2014 | Dec. 31, 2013
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities | $ 389,961 | $ 406,943
Fair Value, Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities | 389,961 | 406,943
Fair Value, Measurements, Recurring [Member] | Total Debt Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities | 389,892 | 406,874
Fair Value, Measurements, Recurring [Member] | Total Debt Securities [Member] | U.S. Government Agencies [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities | 24,408 | 25,451
Fair Value, Measurements, Recurring [Member] | Total Debt Securities [Member] | U.S. Government Sponsored Enterprises (GSE) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities | 1,464 | 13,714
Fair Value, Measurements, Recurring [Member] | Total Debt Securities [Member] | States and Political Subdivisions [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities | 52,833 | 71,544
Fair Value, Measurements, Recurring [Member] | Total Debt Securities [Member] | GSE Residential Mortgage-Backed Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities | 157,345 | 198,619
Fair Value, Measurements, Recurring [Member] | Total Debt Securities [Member] | GSE Residential Collateralized Mortgage Obligations (CMOs) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities | 88,627 | 40,532
Fair Value, Measurements, Recurring [Member] | Total Debt Securities [Member] | GSE Commercial CMOs [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities | 65,215 | 57,014
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Financial Services [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities | 69 | 69
Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities | 0 | 0
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities | 0 | 0
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Total Debt Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities | 0 | 0
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Total Debt Securities [Member] | U.S. Government Agencies [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities | 0 | 0
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Total Debt Securities [Member] | U.S. Government Sponsored Enterprises (GSE) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities | 0 | 0
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Total Debt Securities [Member] | States and Political Subdivisions [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities | 0 | 0
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Total Debt Securities [Member] | GSE Residential Mortgage-Backed Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities | 0 | 0
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Total Debt Securities [Member] | GSE Residential Collateralized Mortgage Obligations (CMOs) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities | 0 | 0
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Total Debt Securities [Member] | GSE Commercial CMOs [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities | 0 | 0
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Financial Services [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities | 0 | 0
Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities | 389,961 | 406,943
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities | 389,961 | 406,943
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Total Debt Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities | 389,892 | 406,874
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Total Debt Securities [Member] | U.S. Government Agencies [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities | 24,408 | 25,451
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Total Debt Securities [Member] | U.S. Government Sponsored Enterprises (GSE) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities | 1,464 | 13,714
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Total Debt Securities [Member] | States and Political Subdivisions [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities | 52,833 | 71,544
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Total Debt Securities [Member] | GSE Residential Mortgage-Backed Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities | 157,345 | 198,619
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Total Debt Securities [Member] | GSE Residential Collateralized Mortgage Obligations (CMOs) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities | 88,627 | 40,532
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Total Debt Securities [Member] | GSE Commercial CMOs [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities | 65,215 | 57,014
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Financial Services [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities | 69 | 69
Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities | 0 | 0
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities | 0 | 0
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Total Debt Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities | 0 | 0
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Total Debt Securities [Member] | U.S. Government Agencies [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities | 0 | 0
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Total Debt Securities [Member] | U.S. Government Sponsored Enterprises (GSE) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities | 0 | 0
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Total Debt Securities [Member] | States and Political Subdivisions [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities | 0 | 0
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Total Debt Securities [Member] | GSE Residential Mortgage-Backed Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities | 0 | 0
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Total Debt Securities [Member] | GSE Residential Collateralized Mortgage Obligations (CMOs) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities | 0 | 0
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Total Debt Securities [Member] | GSE Commercial CMOs [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities | 0 | 0
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Financial Services [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities | $ 0 | $ 0

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