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Business Combinations (Summary of FDIC Indemnification Asset) (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
FDIC Indemnification Asset [Roll Forward]        
Balance at beginning of period $ 18,263 $ 10,029 $ 16,701 $ 6,100
Reductions from reimbursable expenses (75) (648) (157) (730)
Amortization 455 506 699 866
Changes in expected reimbursements (to) from the FDIC for changes in expected credit losses and reimbursable expenses (3,673) 1,785 (2,659) 5,073
Payments received from the FDIC (405) (57) (791) (420)
Balance at end of period $ 15,375 $ 11,729 $ 15,375 $ 11,729