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Loans and the Allowance for Credit Losses - Recorded Investment in Non-Accrual Loans and TDRs (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Financing Receivable, Impaired [Line Items]    
Non-accrual loans $ 31,784 $ 33,381
TDRs 11,192 16,165
Accruing TDRs [Member]    
Financing Receivable, Impaired [Line Items]    
TDRs 7,646 11,548
Non-Accrual TDRs [Member]    
Financing Receivable, Impaired [Line Items]    
TDRs 3,546 4,617
Commercial Real Estate - Land and Construction [Member]    
Financing Receivable, Impaired [Line Items]    
Non-accrual loans 766 1,023
TDRs 8 1,398
Commercial Real Estate - Land and Construction [Member] | Accruing TDRs [Member]    
Financing Receivable, Impaired [Line Items]    
TDRs   967
Commercial Real Estate - Land and Construction [Member] | Non-Accrual TDRs [Member]    
Financing Receivable, Impaired [Line Items]    
TDRs 8 431
Commercial Real Estate - Improved Property [Member]    
Financing Receivable, Impaired [Line Items]    
Non-accrual loans 9,535 11,507
TDRs 2,306 3,506
Commercial Real Estate - Improved Property [Member] | Accruing TDRs [Member]    
Financing Receivable, Impaired [Line Items]    
TDRs 1,618 2,064
Commercial Real Estate - Improved Property [Member] | Non-Accrual TDRs [Member]    
Financing Receivable, Impaired [Line Items]    
TDRs 688 1,442
Commercial and Industrial [Member]    
Financing Receivable, Impaired [Line Items]    
Non-accrual loans 4,299 8,148
TDRs 303 487
Commercial and Industrial [Member] | Accruing TDRs [Member]    
Financing Receivable, Impaired [Line Items]    
TDRs 152 205
Commercial and Industrial [Member] | Non-Accrual TDRs [Member]    
Financing Receivable, Impaired [Line Items]    
TDRs 151 282
Home Equity [Member]    
Financing Receivable, Impaired [Line Items]    
Non-accrual loans 3,538 2,391
TDRs 770 860
Home Equity [Member] | Accruing TDRs [Member]    
Financing Receivable, Impaired [Line Items]    
TDRs 473 642
Home Equity [Member] | Non-Accrual TDRs [Member]    
Financing Receivable, Impaired [Line Items]    
TDRs 297 218
Commercial Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Non-accrual loans 10,301 12,530
TDRs 2,314 4,904
Commercial Real Estate [Member] | Accruing TDRs [Member]    
Financing Receivable, Impaired [Line Items]    
TDRs 1,618 3,031
Commercial Real Estate [Member] | Non-Accrual TDRs [Member]    
Financing Receivable, Impaired [Line Items]    
TDRs 696 1,873
Residential Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Non-accrual loans 12,994 9,461
TDRs 7,523 9,287
Residential Real Estate [Member] | Accruing TDRs [Member]    
Financing Receivable, Impaired [Line Items]    
TDRs 5,311 7,227
Residential Real Estate [Member] | Non-Accrual TDRs [Member]    
Financing Receivable, Impaired [Line Items]    
TDRs 2,212 2,060
Consumer [Member]    
Financing Receivable, Impaired [Line Items]    
Non-accrual loans 652 851
TDRs 282 627
Consumer [Member] | Accruing TDRs [Member]    
Financing Receivable, Impaired [Line Items]    
TDRs 92 443
Consumer [Member] | Non-Accrual TDRs [Member]    
Financing Receivable, Impaired [Line Items]    
TDRs $ 190 $ 184