Fair Values of Assets and Liabilities - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Detail) (USD $)
Dec. 31, 2013
Dec. 31, 2012
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]    
Total assets $ 201,282,000 $ 263,073,000
Total liabilities 57,000 12,000
Derivative Loan Commitments [Member]
    
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]    
Derivative loan commitments 13,000 288,000
Forward Loan Sale Commitments [Member]
    
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]    
Total assets 75,000  
Derivative loan commitments 75,000  
Total liabilities   12,000
Loan Level Interest Rate Swaps [Member]
    
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]    
Total assets 57,000  
Total liabilities 57,000  
Debt Securities [Member]
    
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]    
Total assets 145,788,000 202,637,000
Marketable Equity Securities [Member]
    
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]    
Total assets 55,349,000 60,148,000
Level 1 [Member]
    
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]    
Total assets 55,349,000 60,148,000
Total liabilities      
Level 1 [Member] | Derivative Loan Commitments [Member]
    
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]    
Derivative loan commitments      
Level 1 [Member] | Forward Loan Sale Commitments [Member]
    
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]    
Total assets     
Derivative loan commitments     
Total liabilities     
Level 1 [Member] | Loan Level Interest Rate Swaps [Member]
    
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]    
Total assets     
Total liabilities     
Level 1 [Member] | Debt Securities [Member]
    
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]    
Total assets      
Level 1 [Member] | Marketable Equity Securities [Member]
    
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]    
Total assets 55,349,000 60,148,000
Level 2 [Member]
    
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]    
Total assets 145,788,000 202,637,000
Total liabilities      
Level 2 [Member] | Derivative Loan Commitments [Member]
    
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]    
Derivative loan commitments      
Level 2 [Member] | Forward Loan Sale Commitments [Member]
    
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]    
Total assets     
Derivative loan commitments     
Total liabilities     
Level 2 [Member] | Loan Level Interest Rate Swaps [Member]
    
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]    
Total assets     
Total liabilities     
Level 2 [Member] | Debt Securities [Member]
    
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]    
Total assets 145,788,000 202,637,000
Level 2 [Member] | Marketable Equity Securities [Member]
    
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]    
Total assets      
Level 3 [Member]
    
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]    
Total assets 145,000 288,000
Total liabilities 57,000 12,000
Level 3 [Member] | Derivative Loan Commitments [Member]
    
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]    
Derivative loan commitments 13,000 288,000
Level 3 [Member] | Forward Loan Sale Commitments [Member]
    
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]    
Total assets 75,000  
Derivative loan commitments 75,000  
Total liabilities   12,000
Level 3 [Member] | Loan Level Interest Rate Swaps [Member]
    
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]    
Total assets 57,000  
Total liabilities 57,000  
Level 3 [Member] | Debt Securities [Member]
    
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]    
Total assets      
Level 3 [Member] | Marketable Equity Securities [Member]
    
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]    
Total assets