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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
Sep. 30, 2014
Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale $ 402,563 $ 406,943
Fair Value, Measurements, Recurring [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 402,563 406,943
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 402,500 406,874
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | U.S. Government Agencies [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 24,176 25,451
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | U.S. government sponsored enterprises (GSE) [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale   13,714
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | States and Political Subdivisions [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 52,014 71,544
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | GSE Residential Mortgage-Backed Securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 179,786 198,619
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | GSE Residential Collateralized Mortgage Obligations (CMOs) [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 81,984 40,532
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | GSE Commercial CMOs [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 64,540 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]    
Securities available for sale 63 69
Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 0 0
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Debt Securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 0 0
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | U.S. Government Agencies [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 0 0
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | U.S. government sponsored enterprises (GSE) [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale   0
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | States and Political Subdivisions [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 0 0
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | GSE Residential Mortgage-Backed Securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 0 0
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | GSE Residential Collateralized Mortgage Obligations (CMOs) [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 0 0
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | GSE Commercial CMOs [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 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]    
Securities available for sale 0 0
Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 402,563 406,943
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Debt Securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 402,500 406,874
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | U.S. Government Agencies [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 24,176 25,451
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | U.S. government sponsored enterprises (GSE) [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale   13,714
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | States and Political Subdivisions [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 52,014 71,544
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | GSE Residential Mortgage-Backed Securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 179,786 198,619
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | GSE Residential Collateralized Mortgage Obligations (CMOs) [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 81,984 40,532
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | GSE Commercial CMOs [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 64,540 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]    
Securities available for sale 63 69
Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 0 0
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Debt Securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 0 0
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | U.S. Government Agencies [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 0 0
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | U.S. government sponsored enterprises (GSE) [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale   0
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | States and Political Subdivisions [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 0 0
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | GSE Residential Mortgage-Backed Securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 0 0
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | GSE Residential Collateralized Mortgage Obligations (CMOs) [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 0 0
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | GSE Commercial CMOs [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 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]    
Securities available for sale $ 0 $ 0