Loans and Leases - Summary of Non-Performing Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled debt restructurings	$ 46,933	$ 45,500
Non-Performing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	65,479	49,897
Troubled debt restructurings	20,428	22,028
Total non-performing loans	85,907	71,925
Other real estate owned (OREO)	32,490	38,918
Total non-performing assets	$ 118,397	$ 110,843
Non-performing loans / total loans and leases	0.58%	0.59%
Non-performing loans + OREO / total loans and leases + OREO	0.79%	0.91%
Non-performing assets / total assets	0.54%	0.63%