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Troubled Debt Restructurings by Accrual Status (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Financing Receivable, Modifications [Line Items]    
Recorded investment in loans $ 304,021 $ 294,478
Residential
   
Financing Receivable, Modifications [Line Items]    
Recorded investment in loans 105,783 107,508
Commercial Real Estate
   
Financing Receivable, Modifications [Line Items]    
Recorded investment in loans 78,719 76,666
Commercial Business
   
Financing Receivable, Modifications [Line Items]    
Recorded investment in loans 28,422 22,003
Home Equity and Second Mortgage
   
Financing Receivable, Modifications [Line Items]    
Recorded investment in loans 37,352 35,269
Troubled Debt Restructuring
   
Financing Receivable, Modifications [Line Items]    
Accruing 1,800 1,662
Nonaccrual 2,208 1,935
Recorded investment in loans 4,008 3,597
Related Allowance for Loan Losses 1,234 1,304
Troubled Debt Restructuring | Residential
   
Financing Receivable, Modifications [Line Items]    
Accruing 501 508
Nonaccrual 171 226
Recorded investment in loans 672 734
Related Allowance for Loan Losses 8 45
Troubled Debt Restructuring | Commercial Real Estate
   
Financing Receivable, Modifications [Line Items]    
Accruing 1,276 1,130
Nonaccrual 361 0
Recorded investment in loans 1,637 1,130
Related Allowance for Loan Losses 0 0
Troubled Debt Restructuring | Commercial Business
   
Financing Receivable, Modifications [Line Items]    
Accruing 0 0
Nonaccrual 1,676 1,709
Recorded investment in loans 1,676 1,709
Related Allowance for Loan Losses 1,226 1,259
Troubled Debt Restructuring | Home Equity and Second Mortgage
   
Financing Receivable, Modifications [Line Items]    
Accruing 23 24
Nonaccrual 0 0
Recorded investment in loans 23 24
Related Allowance for Loan Losses $ 0 $ 0