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Loans and Allowance for Loan and Lease Losses (Troubled Debt Restructurings) (Detail)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
USD ($)
Loans
Jun. 30, 2016
Loans
Jun. 30, 2017
USD ($)
Loans
Jun. 30, 2016
Loans
Dec. 31, 2016
USD ($)
Loans
Contract
Dec. 31, 2015
USD ($)
Financing Receivable, Modifications [Line Items]            
Financing Receivable, Modifications, Number of Contracts | Loans 0 0 0 0 0  
Financing Receivable, Modifications, Pre-Modification Recorded Investment     $ 4,216,000   $ 5,368,000 $ 4,407,000
Financing Receivable, Modifications, Post-Modification Recorded Investment     4,746,000   4,823,000 3,879,000
Financing Receivable, Modifications, Recorded Investment $ 3,030,000   3,030,000   $ 3,515,000 2,805,000
Entity Loan Modification Program [Member]            
Financing Receivable, Modifications [Line Items]            
Financing Receivable, Modifications, Number of Contracts | Contract         3  
Financing Receivable, Modifications, Pre-Modification Recorded Investment         $ 1,002,000  
Financing Receivable, Modifications, Post-Modification Recorded Investment         982,000  
Financing Receivable, Modifications, Recorded Investment         982,000  
Commercial Portfolio [Member] | Commercial and Industrial [Member]            
Financing Receivable, Modifications [Line Items]            
Financing Receivable, Modifications, Pre-Modification Recorded Investment         40,000 40,000
Financing Receivable, Modifications, Post-Modification Recorded Investment         35,000 35,000
Financing Receivable, Modifications, Recorded Investment         5,000 15,000
Commercial Portfolio [Member] | Commercial Real Estate [Member]            
Financing Receivable, Modifications [Line Items]            
Financing Receivable, Modifications, Pre-Modification Recorded Investment     3,457,000   4,569,000 3,634,000
Financing Receivable, Modifications, Post-Modification Recorded Investment     4,003,000   4,031,000 3,117,000
Financing Receivable, Modifications, Recorded Investment 2,407,000   2,407,000   $ 2,871,000 2,235,000
Commercial Portfolio [Member] | Commercial Real Estate [Member] | Entity Loan Modification Program [Member]            
Financing Receivable, Modifications [Line Items]            
Financing Receivable, Modifications, Number of Contracts | Contract         2  
Financing Receivable, Modifications, Pre-Modification Recorded Investment         $ 934,000  
Financing Receivable, Modifications, Post-Modification Recorded Investment         914,000  
Financing Receivable, Modifications, Recorded Investment         914,000  
Residential Portfolio [Member] | Residential Mortgage [Member]            
Financing Receivable, Modifications [Line Items]            
Financing Receivable, Modifications, Pre-Modification Recorded Investment     759,000   759,000 733,000
Financing Receivable, Modifications, Post-Modification Recorded Investment     743,000   757,000 727,000
Financing Receivable, Modifications, Recorded Investment $ 623,000   $ 623,000   $ 639,000 $ 555,000
Residential Portfolio [Member] | Residential Mortgage [Member] | Entity Loan Modification Program [Member]            
Financing Receivable, Modifications [Line Items]            
Financing Receivable, Modifications, Number of Contracts | Contract         1  
Financing Receivable, Modifications, Pre-Modification Recorded Investment         $ 68,000  
Financing Receivable, Modifications, Post-Modification Recorded Investment         68,000  
Financing Receivable, Modifications, Recorded Investment         $ 68,000