Loans, Allowance for Loan Losses, and Credit Quality Changes in the Allowance for Loan Losses (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Changes in the allowance for loan losses
Loans and Leases Receivable, Allowance, Beginning Balance	$ 297,409	$ 378,151	$ 476,813
Provision for loan losses	10,000	3,000	52,000
Charge offs	(88,061)	(117,046)	(189,732)
Recoveries	48,967	33,304	39,070
Net charge offs	(39,094)	(83,742)	(150,662)
Loans and Leases Receivable, Allowance, Ending Balance	$ 268,315	$ 297,409	$ 378,151