Loans - Non-Covered Loans Modified as TDR (Detail) (Troubled Debt Restructurings Subsequently Defaulted [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2014 Contract	Jun. 30, 2014 Contract
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts	1	5
Recorded Investment	$ 1,943	$ 7,883
Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts	1	1
Recorded Investment	1,943	1,943
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts	0	3
Recorded Investment	0	5,866
Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts	0	1
Recorded Investment	$ 0	$ 74