Loan and Lease Financings (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Receivables [Abstract]
Total loans and leases	$ 3,549,324,000	$ 3,327,553,000	$ 3,090,543,000
Deferred loan and lease costs	3,810,000	3,680,000
Direct finance leases:
Rentals receivable	245,207,000	256,851,000
Estimated residual value of leased assets	12,537,000	13,131,000
Gross investment in lease financing	257,744,000	269,982,000
Unearned income	(38,946,000)	(43,209,000)
Net investment in lease financing	218,798,000	226,773,000
Minimum future lease payments receivable
2014	46,330,000
2015	41,480,000
2016	35,610,000
2017	30,030,000
2018	27,470,000
Loans to certain directors, executive officers, and principal shareholders of equity securities of the entity and to their affiliates
Loan to related parties	17,960,000	14,940,000
New loans and other additions to related parties	3,770,000
Repayments and other reductions of loan given to related parties	$ 750,000