Loans and Leases Loans and Leases (Details 10) (CapitalSource Inc. [Member], Purchased Credit Impaired Loans and Leases [Member], USD $) In Thousands, unless otherwise specified	Dec. 31, 2014
CapitalSource Inc. [Member] | Purchased Credit Impaired Loans and Leases [Member]
Accretable Yield on Purchased Credit Impaired Loans [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Contractually Required Payments Receivable at Acquisition	$ 231,832
Accretable yield	13,728
Certain Loans Acquired in Transfer, Nonaccretable Difference	(138,870)
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition	92,962
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value	$ (79,234)