Allowances for Loan Losses - Activity in Allowance for Losses on Covered Loans (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, beginning of period			$ 64,069
(Recovery of) provision for loan losses	(3,945)	14,467	(18,387)	33,587
Balance, end of period	45,682		45,682
Covered Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, beginning of period			64,069	51,311
(Recovery of) provision for loan losses	(3,945)	9,467	(18,387)	18,587
Balance, end of period	$ 45,682	$ 69,897	$ 45,682	$ 69,897