Cash and Cash Equivalents (Restricted Cash) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted non-interest bearing cash	$ 13,146	$ 2,668
Reserve for FRB Requirement
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted non-interest bearing cash	1,100	991
Escrow Deposit for Deferred Interest
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted non-interest bearing cash	877
Secure Interest Swap Transactions and Foreign Currency Exchange
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted non-interest bearing cash	572	604
Held for Future Tenant Improvement by Company's Subsidiary
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted non-interest bearing cash	1,100	1,100
Held for Intercompany Agreement by Company's Subsidiary
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted non-interest bearing cash	$ 9,500