Acquisitions (Details) (USD $)	3 Months Ended			0 Months Ended				0 Months Ended				0 Months Ended				3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Jan. 30, 2014 Infinity Franchise Holdings Acquisition item	Mar. 31, 2014 Infinity Franchise Holdings Acquisition Acquired Loans	Jan. 30, 2014 Infinity Franchise Holdings Acquisition As initially reported	Jan. 30, 2014 Infinity Franchise Holdings Acquisition Fair Value Adjustments	Jun. 25, 2013 San Diego Trust Bank	Mar. 31, 2014 San Diego Trust Bank Acquired Loans	Jun. 25, 2013 San Diego Trust Bank As initially reported	Jun. 25, 2013 San Diego Trust Bank Fair Value Adjustments	Mar. 15, 2013 First Association Bank	Mar. 31, 2014 First Association Bank Acquired Loans	Mar. 15, 2013 First Association Bank As initially reported	Mar. 15, 2013 First Association Bank Fair Value Adjustments	Mar. 31, 2014 Maximum
Acquisitions
Extension period for measurement of fair values																1 year
Cash consideration				$ 8,300,000				$ 16,200,000				$ 43,000,000
Number of shares of common stock issued as consideration				562,469				1,198,255				1,279,217
Stock price of the acquired entity (in dollars per share)				$ 16.02
Period prior to announcement of the transaction for which average closing price is considered to calculate value of shares to be issued				10 days
Delinquent loans or adversely classified assets	2,674,000	3,102,000	2,251,000	0
Number of entities in business combination				2
ASSETS ACQUIRED
Cash and cash equivalents				555,000		555,000		30,252,000		30,252,000		167,663,000		167,663,000
Investment securities								124,805,000		124,960,000	(155,000)	222,391,000		219,913,000	2,478,000
Loans, gross				78,833,000		78,833,000		42,722,000		42,945,000	(223,000)	26,422,000		26,264,000	158,000
Deferred loan costs						1,082,000	(1,082,000)
Allowance for loan losses						(268,000)	268,000			(1,013,000)	1,013,000			(224,000)	224,000
Other real estate owned								752,000		752,000
Core deposit intangible								2,836,000			2,836,000	1,930,000			1,930,000
Other assets				776,000		776,000		9,856,000		9,856,000		5,823,000		5,823,000
Total assets acquired				80,164,000		80,978,000	(814,000)	211,223,000		207,752,000	3,471,000	424,229,000		419,439,000	4,790,000
LIABILITIES ASSUMED
Deposits								183,907,000		183,901,000	6,000	356,818,000		356,737,000	81,000
Bank loan				67,617,000		67,617,000						16,905,000		16,905,000
Accrued compensation				495,000		495,000
Deferred tax liability (asset)								1,174,000		(333,000)	1,507,000	3,918,000			3,918,000
Other liabilities				214,000		214,000		1,094,000		1,823,000	(729,000)	536,000		536,000
Total liabilities assumed				68,326,000		68,326,000		186,175,000		185,391,000	784,000	378,177,000		374,178,000	3,999,000
Excess of assets acquired over liabilities assumed				11,838,000		12,652,000	(814,000)	25,048,000		22,361,000	2,687,000	46,052,000		45,261,000	791,000
Consideration paid				17,360,000				30,622,000				57,906,000
Goodwill recognized	22,950,000	11,854,000	17,428,000	5,522,000				5,574,000				11,854,000
Total purchase credit impaired loans	1,957,000			0				0				0
Contractual amounts due, expected cash flows to be collected, interest component and fair value as of the respective acquisition dates
Contractual amounts due					98,320,000				47,251,000				32,107,000
Expected cash flows					98,320,000				47,251,000				32,107,000
Interest component of expected cash flows					19,487,000				4,529,000				5,685,000
Fair value of acquired loans					78,833,000				42,722,000				26,422,000
Pro forma net interest and other income, net income and earnings per share
Net interest and other income	18,722,000	16,543,000
Net income	$ 2,251,000	$ 1,909,000
Basic earnings per share (in dollars per share)	$ 0.13	$ 0.12
Diluted earnings per share (in dollars per share)	$ 0.13	$ 0.12