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Derivative Financial Instruments (Schedule of Amounts Related to Interest Rate Derivatives Designated as Hedges of Fair Value) (Detail) - Designated as Hedging Instrument [Member] - Commercial Loan/Lease Interest Rate Swaps [Member] - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Interest Income on Loans [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount included in income or expense $ 86 $ 25 $ (726)
Other Non-Interest Expense [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount included in income or expense $ 0 $ (1) $ (14)