Covered Assets and FDIC Indemnification Asset (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Covered loans [Line Items]
Covered loans	$ 242,724		$ 242,724		$ 269,081
Allowance for loan losses	(1,007)		(1,007)		(870)
Subtotal, before discounts	307,549		307,549		350,764
Fair Value discount	(64,825)		(64,825)		(81,683)
Total covered loans, net	241,717		241,717		268,211
Other Real Estate, Covered [Roll Forward]
Balance, beginning of period	25,973	28,826	26,622	29,766
Additions to covered OREO	1,648	8,024	4,374	14,622
Capitalized improvements		673		746
Dispositions of covered OREO, net	(4,621)	(4,833)	(7,996)	(12,444)
Balance, end of period	23,000	32,690	23,000	32,690
FDIC Indemnification Asset [Roll Forward]
Balance, beginning of period	60,898	97,274	65,586	106,067
Change in FDIC indemnification asset	(3,145)	(1,442)	(6,136)	(3,044)
Reduction due to loans paid in full	(1,171)	(2,441)	(3,624)	(5,927)
Transfers to (due from) FDIC	(1,715)	(3,485)	(959)	(7,190)
Balance, end of period	54,867	89,906	54,867	89,906
City Bank [Member]
Covered loans [Line Items]
Covered loans	157,354		157,354		170,125
Allowance for loan losses	(792)		(792)		(655)
Subtotal, before discounts	195,276		195,276		216,224
Fair Value discount	(37,922)		(37,922)		(46,099)
Total covered loans, net	156,562		156,562		169,470
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Balance at beginning of period	71,017	45,804	78,004	56,079
Accretion to interest income	(5,555)	(5,961)	(11,305)	(12,025)
Disposals	(1,508)	(5,480)	(2,723)	(9,691)
Reclassifications (to) from nonaccretable difference	(331)	36,726	(353)	36,726
Balance at end of period	63,623	71,089	63,623	71,089
Other Real Estate, Covered [Roll Forward]
Balance, beginning of period	18,295	17,463	19,341	17,906
Additions to covered OREO	(676)	5,919	(1,002)	11,927
Capitalized improvements		0		0
Dispositions of covered OREO, net	(4,039)	(2,092)	(4,759)	(8,543)
Balance, end of period	13,580	21,290	13,580	21,290
FDIC Indemnification Asset [Roll Forward]
Balance, beginning of period	40,976	62,008	43,235	66,560
Change in FDIC indemnification asset	(2,898)	(1,867)	(5,763)	(3,888)
Reduction due to loans paid in full	(751)	(2,441)	(1,324)	(5,927)
Transfers to (due from) FDIC	260	(1,057)	1,439	(102)
Balance, end of period	37,587	56,643	37,587	56,643
North County Bank [Member]
Covered loans [Line Items]
Covered loans	85,370		85,370		98,956
Allowance for loan losses	(215)		(215)		(215)
Subtotal, before discounts	112,273		112,273		134,540
Fair Value discount	(26,903)		(26,903)		(35,584)
Total covered loans, net	85,155		85,155		98,741
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Balance at beginning of period	23,637	25,463	29,574	27,880
Accretion to interest income	(3,841)	(2,188)	(7,749)	(4,605)
Disposals	(691)	0	(2,721)	0
Reclassifications (to) from nonaccretable difference	7,740	0	7,741	0
Balance at end of period	26,845	23,275	26,845	23,275
Other Real Estate, Covered [Roll Forward]
Balance, beginning of period	7,678	11,363	7,281	11,860
Additions to covered OREO	2,324	2,105	5,376	2,695
Capitalized improvements		673		746
Dispositions of covered OREO, net	(582)	(2,741)	(3,237)	(3,901)
Balance, end of period	9,420	11,400	9,420	11,400
FDIC Indemnification Asset [Roll Forward]
Balance, beginning of period	19,922	35,266	22,351	39,507
Change in FDIC indemnification asset	(247)	425	(373)	844
Reduction due to loans paid in full	(420)	0	(2,300)	0
Transfers to (due from) FDIC	(1,975)	(2,428)	(2,398)	(7,088)
Balance, end of period	17,280	33,263	17,280	33,263
Direct Consumer Loan [Member]
Covered loans [Line Items]
Covered loans	6,094		6,094		14,768
Direct Consumer Loan [Member] | City Bank [Member]
Covered loans [Line Items]
Covered loans	3,043		3,043		3,562
Direct Consumer Loan [Member] | North County Bank [Member]
Covered loans [Line Items]
Covered loans	3,051		3,051		11,206
Commercial [Member]
Covered loans [Line Items]
Covered loans	35,895		35,895		43,588
Commercial [Member] | City Bank [Member]
Covered loans [Line Items]
Covered loans	16,439		16,439		17,380
Commercial [Member] | North County Bank [Member]
Covered loans [Line Items]
Covered loans	19,456		19,456		26,208
Real Estate Mortgage [Member]
Covered loans [Line Items]
Covered loans	223,563		223,563		246,063
Real Estate Mortgage [Member] | City Bank [Member]
Covered loans [Line Items]
Covered loans	152,881		152,881		167,701
Real Estate Mortgage [Member] | North County Bank [Member]
Covered loans [Line Items]
Covered loans	70,682		70,682		78,362
Real Estate Mortgage [Member] | One to Four Family Residential [Member]
Covered loans [Line Items]
Covered loans	14,736		14,736		15,753
Real Estate Mortgage [Member] | One to Four Family Residential [Member] | City Bank [Member]
Covered loans [Line Items]
Covered loans	3,876		3,876		4,673
Real Estate Mortgage [Member] | One to Four Family Residential [Member] | North County Bank [Member]
Covered loans [Line Items]
Covered loans	10,860		10,860		11,080
Real Estate Mortgage [Member] | Multi Family and Commercial [Member]
Covered loans [Line Items]
Covered loans	208,827		208,827		230,310
Real Estate Mortgage [Member] | Multi Family and Commercial [Member] | City Bank [Member]
Covered loans [Line Items]
Covered loans	149,005		149,005		163,028
Real Estate Mortgage [Member] | Multi Family and Commercial [Member] | North County Bank [Member]
Covered loans [Line Items]
Covered loans	59,822		59,822		67,282
Real Estate Construction [Member]
Covered loans [Line Items]
Covered loans	41,997		41,997		46,345
Real Estate Construction [Member] | City Bank [Member]
Covered loans [Line Items]
Covered loans	22,913		22,913		27,581
Real Estate Construction [Member] | North County Bank [Member]
Covered loans [Line Items]
Covered loans	19,084		19,084		18,764
Real Estate Construction [Member] | One to Four Family Residential [Member]
Covered loans [Line Items]
Covered loans	11,702		11,702		11,875
Real Estate Construction [Member] | One to Four Family Residential [Member] | City Bank [Member]
Covered loans [Line Items]
Covered loans	7,092		7,092		6,102
Real Estate Construction [Member] | One to Four Family Residential [Member] | North County Bank [Member]
Covered loans [Line Items]
Covered loans	4,610		4,610		5,773
Real Estate Construction [Member] | Multi Family and Commercial [Member]
Covered loans [Line Items]
Covered loans	30,295		30,295		34,470
Real Estate Construction [Member] | Multi Family and Commercial [Member] | City Bank [Member]
Covered loans [Line Items]
Covered loans	15,821		15,821		21,479
Real Estate Construction [Member] | Multi Family and Commercial [Member] | North County Bank [Member]
Covered loans [Line Items]
Covered loans	$ 14,474		$ 14,474		$ 12,991