Loans Held for Investment (Details) (USD $)					9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2013 Maximum	Sep. 30, 2013 Canyon National	Sep. 30, 2013 Palm Desert National	Sep. 30, 2013 San Diego Trust Bank	Sep. 30, 2013 FAB	Sep. 30, 2013 Business loans: Commercial and industrial	Dec. 31, 2012 Business loans: Commercial and industrial	Sep. 30, 2012 Business loans: Commercial and industrial	Dec. 31, 2011 Business loans: Commercial and industrial	Sep. 30, 2013 Business loans: Commercial owner occupied	Dec. 31, 2012 Business loans: Commercial owner occupied	Sep. 30, 2012 Business loans: Commercial owner occupied	Dec. 31, 2011 Business loans: Commercial owner occupied	Sep. 30, 2013 Business loans: SBA	Dec. 31, 2012 Business loans: SBA	Sep. 30, 2012 Business loans: SBA	Dec. 31, 2011 Business loans: SBA	Sep. 30, 2013 Business loans: Warehouse facilities	Dec. 31, 2012 Business loans: Warehouse facilities	Sep. 30, 2012 Business loans: Warehouse facilities	Dec. 31, 2011 Business loans: Warehouse facilities	Sep. 30, 2013 Real estate loans: Commercial non-owner occupied	Dec. 31, 2012 Real estate loans: Commercial non-owner occupied	Sep. 30, 2012 Real estate loans: Commercial non-owner occupied	Dec. 31, 2011 Real estate loans: Commercial non-owner occupied	Sep. 30, 2013 Real estate loans: Multi-family	Dec. 31, 2012 Real estate loans: Multi-family	Sep. 30, 2012 Real estate loans: Multi-family	Dec. 31, 2011 Real estate loans: Multi-family	Sep. 30, 2013 Real estate loans: One-to-four family	Dec. 31, 2012 Real estate loans: One-to-four family	Sep. 30, 2012 Real estate loans: One-to-four family	Dec. 31, 2011 Real estate loans: One-to-four family	Sep. 30, 2013 Real estate loans: Construction	Sep. 30, 2012 Real estate loans: Construction	Sep. 30, 2013 Real estate loans: Land	Dec. 31, 2012 Real estate loans: Land	Sep. 30, 2012 Real estate loans: Land	Dec. 31, 2011 Real estate loans: Land	Sep. 30, 2013 Other loans	Dec. 31, 2012 Other loans	Sep. 30, 2012 Other loans	Dec. 31, 2011 Other loans
Loans Held for Investment
Total gross loans	$ 1,142,015,000	$ 986,194,000	$ 864,838,000							$ 173,720,000	$ 115,354,000	$ 88,105,000		$ 222,162,000	$ 150,934,000	$ 148,139,000		$ 6,455,000	$ 6,882,000	$ 4,736,000		$ 49,104,000	$ 195,761,000	$ 112,053,000		$ 304,979,000	$ 253,409,000	$ 262,046,000		$ 218,929,000	$ 156,424,000	$ 173,484,000		$ 152,667,000	$ 97,463,000	$ 62,771,000		$ 2,835,000	$ 308,000	$ 7,371,000	$ 8,774,000	$ 11,005,000		$ 3,793,000	$ 1,193,000	$ 2,191,000
Less loans held for sale, net	3,176,000	3,681,000	4,728,000
Total gross loans held for investment	1,138,839,000	982,513,000	860,110,000
Less: Deferred loan origination costs (fees) and premiums (discounts), net	130,000	(306,000)	(737,000)
Less: Allowance for loan losses	(7,994,000)	(7,994,000)	(7,658,000)	(8,522,000)						(2,801,000)	(1,310,000)	(824,000)	(1,361,000)	(1,519,000)	(1,512,000)	(1,151,000)	(1,119,000)	(50,000)	(79,000)	(66,000)	(80,000)	(225,000)	(1,544,000)	(1,046,000)	(1,347,000)	(1,403,000)	(1,459,000)	(2,036,000)	(1,287,000)	(506,000)	(1,145,000)	(2,097,000)	(2,281,000)	(1,174,000)	(862,000)	(418,000)	(931,000)	(121,000)		(147,000)	(31,000)		(39,000)	(48,000)	(52,000)	(20,000)	(77,000)
Loans held for investment, net	1,130,975,000	974,213,000	851,715,000
Unaccreted mark-to-market discount						2,300,000	3,700,000	230,000
Mark-to-market premium									103,000
Secured loans limit to one borrower (as a percent)					25.00%
Unsecured loans limit to one borrower (as a percent)					15.00%
Secured loans limit to one borrower	45,800,000
Unsecured loans limit to one borrower	27,500,000
Aggregate outstanding balance of loans to one borrower of secured credit	$ 34,900,000