Covered Assets and Indemnification Asset, OREO and FDIC Assets (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Other real estate covered [Roll Forward]
Balance, beginning of period	$ 26,622	$ 29,766
Additions to covered OREO	9,716	25,065
Capitalized improvements	0	697
Dispositions of covered OREO, net	(19,174)	(22,234)
Valuation adjustments	(3,704)	(6,672)
Balance, end of period	13,460	26,622	29,766
FDIC indemnification asset [Roll Forward]
Balance, beginning of period	65,586	106,067
Change in FDIC indemnification asset	(9,126)	(9,232)	1,884
Reduction due to loans paid in full	(5,584)	(12,821)
Transfers to (due from) FDIC	(16,305)	(18,428)
Balance, end of period	34,571	65,586	106,067
City Bank [Member]
Other real estate covered [Roll Forward]
Balance, beginning of period	19,341	17,906
Additions to covered OREO	2,515	23,490
Capitalized improvements	0	0
Dispositions of covered OREO, net	(11,991)	(15,401)
Valuation adjustments	(2,466)	(6,654)
Balance, end of period	7,399	19,341
FDIC indemnification asset [Roll Forward]
Balance, beginning of period	43,235	66,560
Change in FDIC indemnification asset	(8,704)	(9,061)
Reduction due to loans paid in full	(2,987)	(8,672)
Transfers to (due from) FDIC	(11,154)	(5,592)
Balance, end of period	20,390	43,235
North County Bank [Member]
Other real estate covered [Roll Forward]
Balance, beginning of period	7,281	11,860
Additions to covered OREO	7,201	1,575
Capitalized improvements	0	697
Dispositions of covered OREO, net	(7,183)	(6,833)
Valuation adjustments	(1,238)	(18)
Balance, end of period	6,061	7,281
FDIC indemnification asset [Roll Forward]
Balance, beginning of period	22,351	39,507
Change in FDIC indemnification asset	(422)	(171)
Reduction due to loans paid in full	(2,597)	(4,149)
Transfers to (due from) FDIC	(5,151)	(12,836)
Balance, end of period	$ 14,181	$ 22,351