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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 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]        
Accretable yield, beginning balance $ 35,692 $ 45,762 $ 36,565 $ 49,408
Acquisitions 0 (105) 0 426
Accretable yield amortized to interest income (4,152) (5,477) (8,771) (11,076)
Accretable yield amortized to indemnification asset/liability 0 (361) 0 (715)
Reclassification from non-accretable difference 1,306 3,554 2,862 6,089
Increases in interest cash flows due to payments and changes in interest rates 1,501 2,137 3,691 1,378
Accretable yield, ending balance $ 34,347 $ 45,510 $ 34,347 $ 45,510