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Summary of Significant Accounting Policies (Details Textual) (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2012
Office
Y
OptionPlan
Wealth_Management_Offices
Banking_Centers
Inactive_Subsidiaries
Financial_Centers
Mar. 31, 2011
Dec. 31, 2011
Loans
Oct. 16, 2009
Summary of Significant Accounting Policies (Textual) [Abstract]        
Number of inactive subsidiaries 3      
FCB Trust II redemption Jan. 07, 2012      
Bank operated business financial centers, number 42      
Bank operated commercial banking centers, number 5      
Bank operated wealth management offices, number 2      
Number of days on which collection of interest on principal is no longer probable 90 days      
Period over which borrower has to demonstrate repayment performance in compliance with restructured terms to take loan out of nonaccrual status 6 months      
Number of days on which charge offs unsecured consumer loan are recorded 120 days      
Single-family mortgage loans returned to accrual status after demonstrating sustained repayment performance     11  
Related allowance $ 1,510,000   $ 2,968,000  
Maximum loan amount for credit review process 1,000,000      
Provision for credit losses    7,068,000    
Estimated gross cash flows from loss sharing asset       144,900,000
Properties under capital lease and leasehold improvements amortizable description shorter of estimated economic lives of 15 years or the initial terms of the leases      
Properties under capital lease and leasehold estimated economic lives under option one 15 years      
Number of Stock-Based Compensation Plans 3      
Number of offices providing services, Citizens trust 2      
Assets under administration, Citizens Trust 2,110,000,000      
Assets under management, Citizens Trust 1,650,000,000      
Core deposit and premium 4,731,000   5,548,000  
Goodwill 55,097,000   55,097,000  
Accumulated amortization 27,300,000      
Amortization expense intangible assets 816,000,000      
Estimated amortization expense for the remainder of 2012 1,300,000      
Estimated amortization expense, for year one 1,100,000      
Estimated amortization expense, for year two 475,000,000      
Estimated amortization expense, for year three 437,000,000      
Estimated amortization expense, for year four 395,000,000      
Estimated amortization expense, for year five $ 955,000,000      
Weighted average remaining life of finite lived intangible assets 1.4      
Shares outstanding 104,707,012   104,482,271  
Original term of modified loans 6 months      
Computer and equipment [Member]
        
Summary of Significant Accounting Policies (Textual) [Abstract]        
Estimated lives, minimum years 3      
Estimated lives, maximum years 5      
Furniture, fixtures and equipment [Member]
        
Summary of Significant Accounting Policies (Textual) [Abstract]        
Estimated lives, minimum years 5      
Estimated lives, maximum years 7      
Buildings and improvements [Member]
        
Summary of Significant Accounting Policies (Textual) [Abstract]        
Estimated lives, minimum years 15      
Estimated lives, maximum years 40      
Maximum [Member]
        
Summary of Significant Accounting Policies (Textual) [Abstract]        
Number of days for which principal or interest payment on non-covered loans remain accrual 89 days      
Minimum [Member]
        
Summary of Significant Accounting Policies (Textual) [Abstract]        
Number of days over which principal or interest payment are past due to consider non-covered loans 30 days      
Number of days for which principal or interest payment on non-covered loans remain accrual 30 days