Business Combinations (Statement of Assets Acquired and Liabilities Assumed at Estimated Fair Values) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Nov. 14, 2012 Circle Bancorp [Member]
Business Acquisition [Line Items]
Cash and equivalents			$ 39,328
Investment securities			793
Non-covered loans and leases, net			246,665
Premises and equipment			7,713
Restricted equity securities	32,783	33,443	2,491
Goodwill			12,545
Other intangible assets			830
Non-covered other real estate owned			1,602
Other assets			5,784
Total assets acquired			317,751
Deposits			250,408
Junior subordinated debentures			8,764
Term debt			55,404
Other liabilities			3,175
Total liabilities assumed			$ 317,751