Loans and Leases - Summary of Activity in the Reserve for Loan and Lease Losses (Details 7) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance				$ 29,870				$ 30,898	$ 29,870	$ 30,898	$ 24,798
Provision for loan and lease losses	2,382	2,210	1,343	4,100	3,140	3,649	5,556	5,134	10,035	17,479	21,565
Charge-offs*									(16,735)	(19,703)	(17,105)
Recoveries									1,576	1,196	1,640
Ending balance	$ 24,746				$ 29,870				$ 24,746	$ 29,870	$ 30,898