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Loans (Activity Related to Accretable Yield of Loans Acquired With Evidence of Credit Quality Deterioration Since Origination) (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]    
Accretable yield, beginning balance $ 36,565 $ 49,408
Acquisitions 0 531
Accretable yield amortized to interest income (4,619) (5,599)
Accretable yield amortized to indemnification asset/liability 0 (354)
Reclassification from non-accretable difference 1,556 2,535
Increases (decreases) in interest cash flows due to payments and changes in interest rates 2,190 (759)
Accretable yield, ending balance $ 35,692 $ 45,762