Acquisitions (Details) (USD $)		0 Months Ended
	Mar. 15, 2013 FAB	Apr. 27, 2012 Palm Desert National item	Feb. 11, 2011 Canyon National item
Acquisitions
Number of branches acquired		1	3
Fair value of assets acquired and received and liabilities assumed
Assets	$ 394,100,000	$ 120,900,000	$ 208,900,000
Investment securities	223,000,000	1,500,000	12,800,000
Cash and cash equivalents	124,700,000	39,500,000	13,200,000
Loans	26,400,000	63,800,000	149,700,000
Goodwill	11,900,000
Other assets	6,200,000	3,800,000	1,500,000
Core deposit intangibles	1,900,000	840,000	2,300,000
Stock issued as part of the acquisition consideration	15,900,000
Liabilities	378,200,000	118,000,000	206,600,000
Deposit transaction accounts	329,500,000	50,100,000
Retail certificates of deposit	17,400,000	30,800,000
Wholesale deposits	9,900,000	34,100,000
Other borrowings	16,900,000
Deferred tax liability	3,900,000	2,400,000	1,900,000
Other liabilities	536,000	578,000	39,000
FDIC receivable			16,100,000
Federal Reserve Bank stock and Federal Home Loan Bank stock			1,300,000
Deposits			204,700,000
Other real estate owned ("OREO");		$ 11,500,000	$ 12,000,000