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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, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]        
Accretable yield, beginning balance $ 34,347 $ 45,510 $ 36,565 $ 49,408
Acquisitions 2,321 0 2,321 426
Accretable yield amortized to interest income (4,144) (5,025) (12,915) (16,101)
Accretable yield amortized to indemnification asset/liability 0 (371) 0 (1,086)
Reclassification from non-accretable difference 1,734 1,017 4,596 7,106
Increases in interest cash flows due to payments and changes in interest rates (1,093) (875) 2,598 503
Accretable yield, ending balance $ 33,165 $ 40,256 $ 33,165 $ 40,256