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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 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]    
Accretable yield, beginning balance $ 34,289 $ 34,876
Acquisitions 0 1,874
Accretable yield amortized to interest income (4,266) (12,179)
Reclassification from non-accretable difference 184 2,190
Increases in interest cash flows due to payments and changes in interest rates 1,164 4,610
Accretable yield, ending balance $ 31,371 $ 31,371