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Loans and Loans Held for Sale - Restructured Loans for Periods Stated (Detail)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
USD ($)
SecurityLoan
Sep. 30, 2014
USD ($)
SecurityLoan
Sep. 30, 2015
USD ($)
SecurityLoan
Sep. 30, 2014
USD ($)
SecurityLoan
Financing Receivable, Modifications [Line Items]        
Number of Loans | SecurityLoan 14 12 41 31
Pre-Modification Outstanding Recorded Investment $ 1,593 [1] $ 1,210 [1] $ 7,001 [2] $ 3,252 [2]
Post-Modification Outstanding Recorded Investment 1,578 [1] 1,179 [1] 5,353 [2] 3,198 [2]
Total Difference in Recorded Investment $ (15) $ (31) $ (1,648) $ (54)
Principal Forgiveness [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Loans | SecurityLoan     1 0
Pre-Modification Outstanding Recorded Investment [2]     $ 400 $ 0
Post-Modification Outstanding Recorded Investment [2]     273 0
Total Difference in Recorded Investment     $ (127) $ 0
Principal Deferral [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Loans | SecurityLoan   3 9 4
Pre-Modification Outstanding Recorded Investment   $ 868 [1] $ 3,616 [2] $ 997 [2]
Post-Modification Outstanding Recorded Investment   841 [1] 2,204 [2] 968 [2]
Total Difference in Recorded Investment   $ (27) $ (1,412) $ (29)
Principal Deferral [Member] | Commercial Real Estate [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Loans | SecurityLoan   1 2 2
Pre-Modification Outstanding Recorded Investment   $ 487 [1] $ 2,851 [2] $ 616 [2]
Post-Modification Outstanding Recorded Investment   475 [1] 1,841 [2] 602 [2]
Total Difference in Recorded Investment   $ (12) $ (1,010) (14)
Principal Deferral [Member] | Commercial Construction [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Loans | SecurityLoan     1  
Pre-Modification Outstanding Recorded Investment [2]     $ 104 0
Post-Modification Outstanding Recorded Investment [2]     0 $ 0
Total Difference in Recorded Investment     $ (104)  
Chapter 7 Bankruptcy [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Loans | SecurityLoan 8 [3] 7 [3] 21 [4] 24 [4]
Pre-Modification Outstanding Recorded Investment $ 198 [1],[3] $ 246 [1],[3] $ 514 [2],[4] $ 1,140 [2],[4]
Post-Modification Outstanding Recorded Investment 188 [1],[3] 242 [1],[3] 467 [2],[4] 1,115 [2],[4]
Total Difference in Recorded Investment $ (10) [3] $ (4) [3] $ (47) $ (25) [4]
Chapter 7 Bankruptcy [Member] | Commercial Real Estate [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Loans | SecurityLoan 0 [3] 1 [3] 0 [4] 1 [4]
Pre-Modification Outstanding Recorded Investment $ 0 [1],[3] $ 83 [1],[3] $ 0 [2],[4] $ 83 [2],[4]
Post-Modification Outstanding Recorded Investment $ 0 [1],[3] $ 83 [1],[3] $ 0 [2],[4] 83 [2],[4]
Total Difference in Recorded Investment [4]       $ 0
Chapter 7 Bankruptcy [Member] | Residential Mortgage [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Loans | SecurityLoan 2 [3] 2 [3] 2 [4] 7 [4]
Pre-Modification Outstanding Recorded Investment $ 74 [1],[3] $ 135 [1],[3] $ 74 [2],[4] $ 464 [2],[4]
Post-Modification Outstanding Recorded Investment $ 74 [1],[3] 134 [1],[3] $ 74 [2],[4] 461 [2],[4]
Total Difference in Recorded Investment   $ (1) [3]   $ (3) [4]
Chapter 7 Bankruptcy [Member] | Home Equity [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Loans | SecurityLoan 5 [3] 2 [3] 17 [4] 12 [4]
Pre-Modification Outstanding Recorded Investment $ 115 [1],[3] $ 14 [1],[3] $ 428 [2],[4] $ 283 [2],[4]
Post-Modification Outstanding Recorded Investment 110 [1],[3] $ 14 [1],[3] 389 [2],[4] 265 [2],[4]
Total Difference in Recorded Investment $ (5) [3]   $ (39) [4] $ (18) [4]
Chapter 7 Bankruptcy [Member] | Installment and Other Consumer [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Loans | SecurityLoan 1 [3] 2 [3] 1 [4] 3 [4]
Pre-Modification Outstanding Recorded Investment $ 9 [1],[3] $ 14 [1],[3] $ 9 [2],[4] $ 23 [2],[4]
Post-Modification Outstanding Recorded Investment 4 [1],[3] 11 [1],[3] 4 [2],[4] 20 [2],[4]
Total Difference in Recorded Investment $ (5) [3] $ (3) [3] $ (5) [4] $ (3) [4]
Interest Rate Reduction and Maturity Date Extension [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Loans | SecurityLoan 2 2 4 2
Pre-Modification Outstanding Recorded Investment $ 138 $ 96 $ 363 [2] $ 96 [2]
Post-Modification Outstanding Recorded Investment $ 138 $ 96 367 [2] 96 [2]
Total Difference in Recorded Investment     $ 4  
Interest Rate Reduction and Maturity Date Extension [Member] | Residential Mortgage [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Loans | SecurityLoan     2  
Pre-Modification Outstanding Recorded Investment [2]     $ 225 0
Post-Modification Outstanding Recorded Investment [2]     229 $ 0
Total Difference in Recorded Investment     $ 4  
Interest Rate Reduction and Maturity Date Extension [Member] | Home Equity [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Loans | SecurityLoan 2 2 2 2
Pre-Modification Outstanding Recorded Investment $ 138 [1] $ 96 [1] $ 138 [2] $ 96 [2]
Post-Modification Outstanding Recorded Investment $ 138 [1] $ 96 [1] 138 [2] 96 [2]
Total Difference in Recorded Investment     $ 0 $ 0
Maturity Date Extension [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Loans | SecurityLoan 4 0 6 1
Pre-Modification Outstanding Recorded Investment $ 1,257 [1] $ 0 [1] $ 2,108 [2] $ 1,019 [2]
Post-Modification Outstanding Recorded Investment 1,252 [1] 0 [1] 2,042 [2] $ 1,019 [2]
Total Difference in Recorded Investment $ (5) $ 0 $ (66)  
Maturity Date Extension [Member] | Commercial Construction [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Loans | SecurityLoan 2 0    
Pre-Modification Outstanding Recorded Investment [1] $ 813 $ 0    
Post-Modification Outstanding Recorded Investment [1] 812 0    
Total Difference in Recorded Investment $ (1) $ 0    
Maturity Date Extension [Member] | Commercial Real Estate [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Loans | SecurityLoan 1 0 1 0
Pre-Modification Outstanding Recorded Investment $ 264 [1] $ 0 [1] $ 264 [2] $ 0 [2]
Post-Modification Outstanding Recorded Investment 260 [1] 0 [1] 260 [2] 0 [2]
Total Difference in Recorded Investment $ (4) $ 0 $ (4) $ 0
Maturity Date Extension [Member] | Commercial Construction [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Loans | SecurityLoan     2 1
Pre-Modification Outstanding Recorded Investment [2]     $ 813 $ 1,019
Post-Modification Outstanding Recorded Investment [2]     812 1,019
Total Difference in Recorded Investment     $ (1)  
Maturity Date Extension [Member] | Residential Mortgage [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Loans | SecurityLoan 1 0    
Pre-Modification Outstanding Recorded Investment $ 180 [2] $ 0 [1]    
Post-Modification Outstanding Recorded Investment $ 180 [2] $ 0 [1]    
Maturity Date Extension [Member] | Home Equity [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Loans | SecurityLoan     1  
Pre-Modification Outstanding Recorded Investment [2]     $ 71 0
Post-Modification Outstanding Recorded Investment [2]     70 $ 0
Total Difference in Recorded Investment     $ (1)  
Commercial and Industrial [Member] | Principal Forgiveness [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Loans | SecurityLoan     1 0
Pre-Modification Outstanding Recorded Investment [2]     $ 400 $ 0
Post-Modification Outstanding Recorded Investment [2]     273 $ 0
Total Difference in Recorded Investment     $ (127)  
Commercial and Industrial [Member] | Principal Deferral [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Loans | SecurityLoan 0 2 6 2
Pre-Modification Outstanding Recorded Investment $ 0 [1] $ 381 [1] $ 661 [2] $ 381 [2]
Post-Modification Outstanding Recorded Investment 0 [1] 366 [1] 363 [2] 366 [2]
Total Difference in Recorded Investment $ 0 $ (15) $ (298) $ (15)
Commercial and Industrial [Member] | Chapter 7 Bankruptcy [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Loans | SecurityLoan [4]     1 1
Pre-Modification Outstanding Recorded Investment [2],[4]     $ 3 $ 287
Post-Modification Outstanding Recorded Investment [2],[4]     0 286
Total Difference in Recorded Investment [4]     $ (3) (1)
Commercial and Industrial [Member] | Maturity Date Extension [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Loans | SecurityLoan     1  
Pre-Modification Outstanding Recorded Investment [2]     $ 780 0
Post-Modification Outstanding Recorded Investment [2]     720 $ 0
Total Difference in Recorded Investment     $ (60)  
[1] Excludes loans that were fully paid off or fully charged-off by period end. The pre-modification balance represents the balance outstanding prior to modification. The post-modification balance represents the outstanding balance at period end.
[2] Excludes loans that were fully paid off or fully charged-off by period end. The pre-modification balance represents the balance outstanding prior to modification. The post-modification balance represents the outstanding balance at period end.
[3] Chapter 7 bankruptcy loans where the debt has been legally discharged through the bankruptcy court and not reaffirmed.
[4] Chapter 7 bankruptcy loans where the debt has been legally discharged through the bankruptcy court and not reaffirmed.