XML 20 R55.htm IDEA: XBRL DOCUMENT

Federally Assisted Acquisition of San Joaquin Bank - Additional Information (Detail) (USD $)	1 Months Ended	12 Months Ended
	Oct. 31, 2009	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Investment [Line Items]
Agreed percentage of loss in loss sharing agreement	80.00%	80.00%
Loss recoveries on covered assets	$ 144,000,000	$ 144,000,000
Loss amount with respect to covered assets	26,700,000	26,700,000
Agreed percentage of reimbursement in loss reimburse agreement	95.00%	95.00%
After-tax gain included in earnings due to purchase method	12,300,000
Remaining discount associated with SJB loans		25,300,000
Expected cash flows		16,400,000
Remaining average lives of loan		4 years 8 months 12 days
Remaining average lives of loan		1 year 1 month 21 days
FDIC loss sharing asset		$ 18,489,000	$ 59,453,000	$ 101,461,000
Maximum contract life		1 year 9 months
Commercial Loans [Member]
Investment [Line Items]
Loss sharing agreement term		5 years
Loss recovery provision term		8 years
Single Family Residential Loans [Member]
Investment [Line Items]
Loss sharing agreement term		10 years
Loss recovery provision term		10 years