Loans and Leases - Summary of Non-Performing Assets (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled debt restructurings	$ 46,783	$ 45,500
Non-Performing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	67,475	49,897
Troubled debt restructurings	22,542	22,028
Total non-performing loans	90,017	71,925
Other real estate owned (OREO)	48,344	38,918
Total non-performing assets	$ 138,361	$ 110,843
Non-performing loans / total loans and leases	0.62%	0.59%
Non-performing loans + OREO / total loans and leases + OREO	0.95%	0.91%
Non-performing assets / of total assets	0.65%	0.63%