Loans - Non-Covered Loans Modified as TDR (Detail) (Troubled Debt Restructurings Subsequently Defaulted [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013 Contract
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts	7
Recorded Investment	$ 7,618
Commercial and industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts	1
Recorded Investment	576
Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts	3
Recorded Investment	6,325
Residential mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts	2
Recorded Investment	643
Home equity [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts	1
Recorded Investment	$ 74