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Significant Accounting Policies (Details Textual) (USD $)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2012
OptionPlan
Jun. 30, 2011
Jun. 30, 2012
OptionPlan
Jun. 30, 2011
Dec. 31, 2011
Loans
Mar. 31, 2012
Summary of Significant Accounting Policies (Textual) [Abstract]            
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  
Maximum loan amount for credit review process     $ 1,000,000      
Related allowance 1,254,000   1,254,000   2,968,000 0
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%      
Provisions for credit losses         7,068,000    
Number of Stock-Based Compensation Plans 3   3      
Core deposit and premium 4,279,000   4,279,000   5,548,000  
Goodwill 55,097,000   55,097,000   55,097,000  
Accumulated amortization 27,700,000   27,700,000      
Amortization of intangible assets 452,000 866,000 1,268,000 1,767,000    
Estimated amortization expense for the remainder of 2012 891,000,000   891,000,000      
Estimated amortization expense, for year one 1,100,000   1,100,000      
Estimated amortization expense, for year two 475,000,000   475,000,000      
Estimated amortization expense, for year three 437,000,000   437,000,000      
Estimated amortization expense, for year four 395,000,000   395,000,000      
Estimated amortization expense, for year five $ 955,000,000   $ 955,000,000      
Weighted average remaining life of finite lived intangible assets 1 year 5 months 5 days   1 year 5 months 5 days      
Shares outstanding 104,807,879   104,807,879   104,482,271  
Original term of modified loans     6 months      
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      
Commercial Loan [Member]
            
Summary of Significant Accounting Policies (Textual) [Abstract]            
Loss sharing agreement term     5 years      
Loss recovery provision term     8 years      
Single Family Residential Loan [Member]
            
Summary of Significant Accounting Policies (Textual) [Abstract]            
Loss sharing agreement term     10 years      
Loss recovery provision term     10 years