Loans and Leases - Summary of Non-Performing Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled debt restructurings	$ 51,236	$ 46,933
Non-Performing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	81,390	65,479
Troubled debt restructurings	23,988	20,428
Total non-performing loans	105,378	85,907
Other real estate owned (OREO)	50,088	32,490
Total non-performing assets	$ 155,466	$ 118,397
Non-performing loans / total loans and leases	0.52%	0.58%
Non-performing loans + OREO / total loans and leases + OREO	0.77%	0.79%
Non-performing assets / of total assets	0.51%	0.54%