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Loans and Loans Held for Sale - Restructured Loans During Periods Presented (Detail)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
USD ($)
contract
Jun. 30, 2015
USD ($)
contract
Jun. 30, 2016
USD ($)
contract
Jun. 30, 2015
USD ($)
contract
Financing Receivable, Modifications [Line Items]        
Number of Loans | contract 22 7 38 27
Pre-Modification Outstanding Recorded Investment [1] $ 10,707 $ 796 $ 13,353 $ 5,408
Post-Modification Outstanding Recorded Investment [1] 8,193 796 10,771 5,381
Total Difference in Recorded Investment $ (2,514) $ 0 $ (2,582) $ (27)
Principal forgiveness        
Financing Receivable, Modifications [Line Items]        
Number of Loans | contract 0 1 0 1
Pre-Modification Outstanding Recorded Investment [1] $ 0 $ 400 $ 0 $ 400
Post-Modification Outstanding Recorded Investment [1] $ 0 400 0 400
Total Difference in Recorded Investment   $ 0 $ 0 $ 0
Principal forgiveness | Commercial and Industrial        
Financing Receivable, Modifications [Line Items]        
Number of Loans | contract 0 1 0 1
Pre-Modification Outstanding Recorded Investment [1] $ 0 $ 400 $ 0 $ 400
Post-Modification Outstanding Recorded Investment [1] 0 400 $ 0 $ 400
Total Difference in Recorded Investment $ 0 $ 0    
Principal deferral        
Financing Receivable, Modifications [Line Items]        
Number of Loans | contract 7 0 8 9
Pre-Modification Outstanding Recorded Investment [1] $ 8,979 $ 0 $ 9,026 $ 3,616
Post-Modification Outstanding Recorded Investment [1] 6,528 0 6,574 3,615
Total Difference in Recorded Investment $ (2,451) $ 0 $ (2,452) $ (1)
Principal deferral | Commercial and Industrial        
Financing Receivable, Modifications [Line Items]        
Number of Loans | contract 5 0 5 6
Pre-Modification Outstanding Recorded Investment [1] $ 985 $ 0 $ 985 $ 661
Post-Modification Outstanding Recorded Investment [1] 985 0 $ 985 $ 661
Total Difference in Recorded Investment $ 0 $ 0    
Principal deferral | Commercial Real Estate        
Financing Receivable, Modifications [Line Items]        
Number of Loans | contract 1 0 1 2
Pre-Modification Outstanding Recorded Investment $ 4,721 $ 0 $ 4,721 [1] $ 2,851 [1]
Post-Modification Outstanding Recorded Investment 2,270 0 2,270 [1] 2,851 [1]
Total Difference in Recorded Investment $ (2,451) $ 0 $ (2,451) $ 0
Principal deferral | Commercial Construction        
Financing Receivable, Modifications [Line Items]        
Number of Loans | contract     0 1
Pre-Modification Outstanding Recorded Investment [1]     $ 0 $ 104
Post-Modification Outstanding Recorded Investment [1]     0 103
Total Difference in Recorded Investment     $ 0 $ (1)
Principal deferral | Residential Mortgage        
Financing Receivable, Modifications [Line Items]        
Number of Loans | contract 1 0 1 0
Pre-Modification Outstanding Recorded Investment [1] $ 3,273 $ 0 $ 3,273 $ 0
Post-Modification Outstanding Recorded Investment [1] 3,273 0 3,273 0
Total Difference in Recorded Investment $ 0 $ 0 $ 0 $ 0
Principal deferral | Home Equity        
Financing Receivable, Modifications [Line Items]        
Number of Loans | contract     1 0
Pre-Modification Outstanding Recorded Investment [1]     $ 47 $ 0
Post-Modification Outstanding Recorded Investment [1]     46 0
Total Difference in Recorded Investment     $ (1) $ 0
Chapter 7 bankruptcy        
Financing Receivable, Modifications [Line Items]        
Number of Loans | contract [2] 7 4 16 13
Pre-Modification Outstanding Recorded Investment [1],[2] $ 154 $ 171 $ 1,328 $ 316
Post-Modification Outstanding Recorded Investment [1],[2] 146 171 1,283 305
Total Difference in Recorded Investment [2] $ (8) $ 0 $ (45) $ (11)
Chapter 7 bankruptcy | Commercial and Industrial        
Financing Receivable, Modifications [Line Items]        
Number of Loans | contract [2]     0 1
Pre-Modification Outstanding Recorded Investment [1],[2]     $ 0 $ 3
Post-Modification Outstanding Recorded Investment [1],[2]     0 1
Total Difference in Recorded Investment [2]     $ 0 $ (2)
Chapter 7 bankruptcy | Commercial Real Estate        
Financing Receivable, Modifications [Line Items]        
Number of Loans | contract [2]     1 0
Pre-Modification Outstanding Recorded Investment [1],[2]     $ 709 $ 0
Post-Modification Outstanding Recorded Investment [1],[2]     681 0
Total Difference in Recorded Investment [2]     $ (28) $ 0
Chapter 7 bankruptcy | Residential Mortgage        
Financing Receivable, Modifications [Line Items]        
Number of Loans | contract [2] 1 0 4  
Pre-Modification Outstanding Recorded Investment [1],[2] $ 65 $ 0 $ 285  
Post-Modification Outstanding Recorded Investment [1],[2] 64 0 280  
Total Difference in Recorded Investment [2] $ (1) $ 0 $ (5)  
Chapter 7 bankruptcy | Home Equity        
Financing Receivable, Modifications [Line Items]        
Number of Loans | contract [2] 4 4 9 12
Pre-Modification Outstanding Recorded Investment [1],[2] $ 73 $ 171 $ 318 $ 313
Post-Modification Outstanding Recorded Investment [1],[2] 69 171 309 304
Total Difference in Recorded Investment [2] $ (4) $ 0 $ (9) $ (9)
Chapter 7 bankruptcy | Installment and Other Consumer        
Financing Receivable, Modifications [Line Items]        
Number of Loans | contract [2] 2 0 2  
Pre-Modification Outstanding Recorded Investment [1],[2] $ 16 $ 0 $ 16  
Post-Modification Outstanding Recorded Investment [1],[2] 13 0 13  
Total Difference in Recorded Investment [2] $ (3) $ 0 $ (3)  
Interest rate reduction        
Financing Receivable, Modifications [Line Items]        
Number of Loans | contract 0 0 0
Pre-Modification Outstanding Recorded Investment [1]     $ 0
Post-Modification Outstanding Recorded Investment [1]   $ 0 0
Total Difference in Recorded Investment   $ 0 $ 0  
Maturity date extension and interest rate reduction        
Financing Receivable, Modifications [Line Items]        
Number of Loans | contract 0 2 1 2
Pre-Modification Outstanding Recorded Investment [1] $ 0 $ 225 $ 130 $ 225
Post-Modification Outstanding Recorded Investment [1] 0 225 128 $ 225
Total Difference in Recorded Investment $ 0 $ 0 $ (2)  
Maturity date extension and interest rate reduction | Residential Mortgage        
Financing Receivable, Modifications [Line Items]        
Number of Loans | contract 0 2 0 2
Pre-Modification Outstanding Recorded Investment $ 0 $ 225 [1] $ 0 [1] $ 225 [1]
Post-Modification Outstanding Recorded Investment 0 225 [1] $ 0 [1] $ 225 [1]
Total Difference in Recorded Investment $ 0 $ 0    
Maturity date extension and interest rate reduction | Home Equity        
Financing Receivable, Modifications [Line Items]        
Number of Loans | contract     1 0
Pre-Modification Outstanding Recorded Investment [1]     $ 130 $ 0
Post-Modification Outstanding Recorded Investment [1]     128 0
Total Difference in Recorded Investment     $ (2) $ 0
Maturity date extension        
Financing Receivable, Modifications [Line Items]        
Number of Loans | contract 8 0 13 2
Pre-Modification Outstanding Recorded Investment [1] $ 1,574 $ 0 $ 2,869 $ 851
Post-Modification Outstanding Recorded Investment [1] 1,519 0 2,786 836
Total Difference in Recorded Investment $ (55) $ 0 $ (83) $ (15)
Maturity date extension | Commercial and Industrial        
Financing Receivable, Modifications [Line Items]        
Number of Loans | contract 1 0 3 1
Pre-Modification Outstanding Recorded Investment [1] $ 130 $ 0 $ 755 $ 780
Post-Modification Outstanding Recorded Investment [1] 130 0 728 765
Total Difference in Recorded Investment $ 0 $ 0 $ (27) $ (15)
Maturity date extension | Commercial Construction        
Financing Receivable, Modifications [Line Items]        
Number of Loans | contract 4 0 5 0
Pre-Modification Outstanding Recorded Investment $ 1,324 $ 0 $ 1,357 [1]  
Post-Modification Outstanding Recorded Investment 1,269 0 1,303 [1]  
Total Difference in Recorded Investment $ (55) $ 0 $ (54)  
Maturity date extension | Residential Mortgage        
Financing Receivable, Modifications [Line Items]        
Number of Loans | contract     1  
Pre-Modification Outstanding Recorded Investment [1]     $ 483  
Post-Modification Outstanding Recorded Investment [1]     $ 483  
Maturity date extension | Home Equity        
Financing Receivable, Modifications [Line Items]        
Number of Loans | contract 3 0 4 1
Pre-Modification Outstanding Recorded Investment $ 120 $ 0 $ 274 [1] $ 71 [1]
Post-Modification Outstanding Recorded Investment 120 0 272 [1] $ 71 [1]
Total Difference in Recorded Investment $ 0 $ 0 $ (2)  
[1] (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] (2) Chapter 7 bankruptcy loans where the debt has been legally discharged through the bankruptcy court and not reaffirmed.