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Loans - Impaired Loans Classified as Troubled Debt Restructured (Detail) - Commercial and Industrial [Member]
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
Contract
Financing Receivable Modifications [Line Items]  
Number of Contracts Modified in the Last 12 Months | Contract 1
Pre-Modification Outstanding Recorded Investment $ 38
Post-Modification Outstanding Recorded Investment $ 38