Non-Covered Loan and Lease Finance Receivables and Allowance for Loan Losses - Summary of Activity Related to Non-Covered Loans Held-for-Sale (Detail) (Non-Covered Loans Held-for-Sale Activity [Member], USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Non-Covered Loans Held-for-Sale Activity [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance, beginning of period	$ 3,667	$ 0
Originations of mortgage loans	0	0
Sales of mortgage loans	0	0
Transfer of mortgage loans to held for investment	0	0
Sales of other loans	(3,667)	0
Transfers of other loans to held-for-sale	0	0
Write-down of loans held-for-sale	0	0
Balance, end of period	$ 0	$ 0