Business Combinations (Details) (USD $)	12 Months Ended			0 Months Ended	12 Months Ended			0 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Apr. 16, 2010 City Bank	Dec. 31, 2012 City Bank	Dec. 31, 2012 City Bank Commercial [Member]	Dec. 31, 2012 City Bank Single family residential mortgage [Member]	Sep. 24, 2010 North County Bank	Dec. 31, 2012 North County Bank	Dec. 31, 2012 North County Bank Single family loans and OREO [Member]	Dec. 31, 2012 North County Bank Commercial and non-single family loans and OREO [Member]	Dec. 31, 2012 City Bank and North County Bank Acquisitions	Dec. 31, 2011 City Bank and North County Bank Acquisitions	Dec. 31, 2010 City Bank and North County Bank Acquisitions	Dec. 31, 2012 City Bank and North County Bank Acquisitions Maximum [Member]
Business Acquisition [Line Items]
Date of bank acquired certain assets and assumed certain liabilities					Apr. 16, 2010
Percentage of losses shared by bank on covered assets (in hundredths)					2.00%
Percentage of losses absorb by FDIC (in hundredths)					80.00%
Percentage of loss recoveries shared by FDIC (in hundredths)					80.00%
Percentage of covered loan portfolio (in hundredths)					100.00%
Effective period for loss share agreement						5 years	10 years
Effective period for loss recovery provisions						8 years	10 years
Period for payment following acquisition date					10 years				10 years
Terms of business acquisition payment to FDIC					50% of the excess, if any, of (i) 20% of the intrinsic loss estimate ($111.0 million) minus (ii) the sum of (a) 25% of the asset discount (or 25% of the asset discount of ($50.7 million)), plus (b) 25% of cumulative loss share payments (as defined in the Agreement), plus (c) the cumulative servicing amount received by the Bank from the FDIC on covered assets.				50% of the excess, if any, of (i) 20% of the intrinsic loss estimate ($46.9 million) minus (ii) the sum of (a) 20% of the net loss amount, plus (b) 25% of the asset discount bid ($62.5 million), plus (c) 3.5% of total loss share assets at acquisition.
Percentage of payment amount to FDIC (in hundredths)					50.00%				50.00%
Intrinsic loss estimate (in hundredths)					20.00%				20.00%
Intrinsic loss estimate					$ 111,000,000				$ 46,900,000
Asset discount (in hundredths)					25.00%				25.00%
Asset discount					50,700,000				62,500,000
Net loss amount (in hundredths)									20.00%
Total loss share (in hundredths)					25.00%				3.50%
Estimated liability					947,000				4,300,000
Description of losses absorb by FDIC										(i) 80% of losses on the first $7.8 million of losses incurred; (ii) 0% of losses on $7.8 million to $12.3 million of losses incurred; and (iii) 80% of losses above $12.3 million of losses incurred.	(i) 80% of losses on the first $33.9 million of losses incurred; (ii) 0% of losses on $33.9 million to $47.9 million of losses incurred; and (iii) 80% of losses above $47.9 million of losses incurred. The FDIC will share in loss recoveries on the covered loan and OREO portfolio.
Losses absorb by FDIC in loss sharing arrangement condition one (in hundredths)										80.00%	80.00%
Losses absorb by FDIC in loss sharing arrangement condition one										7,800,000	33,900,000
Percentage of losses absorb by FDIC in loss sharing arrangement condition two (in hundredths)										0.00%	0.00%
Losses absorb by FDIC in loss sharing arrangement two, Minimum										7,800,000	33,900,000
Losses absorb by FDIC in loss sharing arrangement condition two, Maximum										12,300,000	47,900,000
Percentage of losses absorb by FDIC in loss sharing arrangement condition three (in hundredths)										80.00%	80.00%
Losses absorb by FDIC in loss sharing arrangement, three										12,300,000	47,900,000
Merger-related expenses	0	324,000	2,113,000									0	324,000	2,100,000
Period for fair value adjustments															1 year
Summary of the net assets (liabilities) received from the FDIC and the estimated fair value adjustments [Abstract]
Cost basis net assets (liabilities)				(54,943,000)				11,217,000
Cash payment received from the FDIC				99,445,000				46,860,000
Net assets acquired before fair value adjustments				44,502,000				58,077,000
Fair value adjustments [Abstract]
Covered loans				(126,378,000)				(67,360,000)
Covered other real estate owned				(551,000)				(6,842,000)
Core deposit intangible				3,293,000				50,000
FDIC indemnification asset				84,393,000				39,000,000
Other assets				(597,000)				(89,000)
Deposits				(6,000,000)				(956,000)
FHLB advances				(103,000)				0
Other liabilities				(3,271,000)				(1,955,000)
FDIC equity appreciation instrument				(2,131,000)				0
Pre-tax bargain purchase gain on acquisition				(6,843,000)				19,925,000
Deferred income tax asset (liability)				2,353,000				(6,974,000)
Bargain purchase gain (goodwill) on acquisition				(4,490,000)				12,951,000
Term of option expiration from acquisition date	90 days
Number of business acquiree locations					8				3
Exercise of option					11,100,000				145,000
Assets [Abstract]
Cash and due from banks				277,907,000				66,770,000
Interest-bearing deposits				2,078,000				4,532,000
Total cash and cash equivalents				279,985,000				71,302,000
Investment securities, available for sale				7,095,000				21,286,000
Covered loans				321,581,000				133,136,000
FHLB stock				4,744,000				402,000
Goodwill				4,490,000				0
Core deposit intangible				3,293,000				50,000
Covered other real estate owned				5,798,000				12,412,000
FDIC indemnification asset				84,393,000				39,000,000
Other assets				6,640,000				2,695,000
Total assets acquired				718,019,000				280,283,000
Liabilities [Abstract]
Deposits				650,104,000				257,845,000
FHLB advances				50,152,000				0
Other liabilities				17,763,000				9,487,000
Total liabilities assumed				718,019,000				267,332,000
Net assets acquired/bargain purchase gain on acquisition, net of tax	0	0	19,925,000	0				12,951,000
Total liabilities assumed and net assets acquired				$ 718,019,000				$ 280,283,000