Acquisitions (Details) (USD $)	9 Months Ended			0 Months Ended		0 Months Ended			0 Months Ended				0 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 Acquired Loans	Jun. 25, 2013 San Diego Trust Bank item	Sep. 30, 2013 San Diego Trust Bank	Jun. 25, 2013 San Diego Trust Bank Maximum	Jun. 25, 2013 San Diego Trust Bank Book Value	Jun. 25, 2013 San Diego Trust Bank Fair Value Adjustments	Mar. 15, 2013 First Association Bank item	Sep. 30, 2013 First Association Bank	Mar. 15, 2013 First Association Bank Book Value	Mar. 15, 2013 First Association Bank Fair Value Adjustments	Apr. 27, 2012 Palm Desert National item	Feb. 11, 2011 Canyon National item
Acquisitions
Cash consideration				$ 16,200,000					$ 43,000,000
Number of shares of common stock issued as consideration				1,198,255					1,279,217
Number of entities in business combination				2					2
Number of branches acquired													1	3
ASSETS ACQUIRED
Cash and cash equivalents				30,252,000			30,252,000		167,663,000		167,663,000		39,500,000	13,200,000
Investment securities				124,805,000			124,960,000	(155,000)	222,391,000		219,913,000	2,478,000	1,500,000	12,800,000
Loans, gross				42,393,000			42,945,000	(552,000)	26,422,000		26,264,000	158,000	63,800,000	149,700,000
Allowance for loan losses							(1,013,000)	1,013,000			(224,000)	224,000
Other real estate owned				752,000			752,000						11,500,000	12,000,000
Core deposit intangible				2,836,000				2,836,000	1,930,000			1,930,000	840,000	2,300,000
Other assets				9,856,000			9,856,000		5,823,000		5,823,000		3,800,000	1,500,000
Total assets acquired				210,894,000			207,752,000	3,142,000	424,229,000		419,439,000	4,790,000	120,900,000	208,900,000
LIABILITIES ASSUMED
Deposits				183,907,000			183,901,000	6,000	356,818,000		356,737,000	81,000		204,700,000
Borrowings									16,905,000		16,905,000
Deferred tax liability (asset)				922,000			(333,000)	1,255,000	3,918,000			3,918,000	2,400,000	1,900,000
Other liabilities				1,823,000			1,823,000		536,000		536,000		578,000	39,000
Total liabilities assumed				186,652,000			185,391,000	1,261,000	378,177,000		374,178,000	3,999,000	118,000,000	206,600,000
Excess of assets acquired over liabilities assumed				24,242,000			22,361,000	1,881,000	46,052,000		45,261,000	791,000
Consideration paid				30,622,000					57,906,000
Goodwill recognized				6,380,000					11,854,000
Total purchase credit impaired loans					0					0
Extension period for measurement of fair values						1 year
Contractual amounts due, expected cash flows to be collected, interest component and fair value as of the respective acquisition dates
Contractual amounts due			79,358,000
Expected cash flows			79,358,000
Interest component of expected cash flows			10,543,000
Fair value of acquired loans			68,815,000
Pro forma net interest and other income, net income and earnings per share
Net interest and other income	52,738,000	55,791,000
Net income	5,648,000	14,902,000
Basic earnings per share (in dollars per share)	$ 0.36	$ 1.16
Diluted earnings per share (in dollars per share)	$ 0.35	$ 1.13
Deposit transaction accounts													50,100,000
Retail certificates of deposit													30,800,000
Wholesale deposits													34,100,000
FDIC receivable														16,100,000
Federal Reserve Bank stock and Federal Home Loan Bank stock														$ 1,300,000