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Deferred Compensation Plans - Additional Information (Detail) (USD $)
 12 Months Ended 2 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Orange National Bancorp [Member]
Dec. 31, 2011
Orange National Bancorp [Member]
Dec. 31, 2010
Orange National Bancorp [Member]
Dec. 31, 2012
Western Security Bank [Member]
Dec. 31, 2011
Western Security Bank [Member]
Dec. 31, 2010
Western Security Bank [Member]
Dec. 31, 2012
Kaweah National Bank [Member]
Dec. 31, 2011
Kaweah National Bank [Member]
Dec. 31, 2010
Kaweah National Bank [Member]
Dec. 31, 2003
Kaweah National Bank [Member]
Feb. 28, 2006
Granite State Bank [Member]
Dec. 31, 2012
Granite State Bank [Member]
Dec. 31, 2011
Granite State Bank [Member]
Dec. 31, 2012
Citizens Commercial Trust and Savings Bank of Pasadena [Member]
Dec. 31, 2011
Citizens Commercial Trust and Savings Bank of Pasadena [Member]
Dec. 31, 2010
Citizens Commercial Trust and Savings Bank of Pasadena [Member]
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]                                      
Benefits paid to retirees in relation to life insurance policies                                 $ 60,000 $ 106,000 $ 106,000
Period for which installments are paid to employees' beneficiaries 10 years                                    
Paid to retirees for death benefit                                 45,000 45,000 45,000
Amounts paid under deferred compensation and salary continuation agreements 1,100,000     60,000 60,000 60,000 636,000 636,000 636,000           80,000 80,000      
Period for payment for deferred compensation and salary continuation agreement 180 months                                    
Paid to Rabbi Trust                         879,000 1,200,000          
Severance costs                   80,000 70,200 118,950              
Deferred compensation agreements expenses $ 494,000 $ 473,000 $ 494,000                                
Maximum percentage of salary defer by individual under deferred compensation plan 75.00%                                    
Maximum percentage of bonus defer by individual under deferred compensation plan 100.00%