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Loans Receivable and Allowance for Loan Losses - Additional Information (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans receivable, net $ 4,833,224,000   $ 4,833,224,000   $ 4,229,311,000
Loans and Leases Receivable, Commitments, Provision for Loan Losses 0 0 0 116,000  
Positive or Negative Qualitative Adjustment of the Loss Migration Ratio or Individual Specific Reserve Allocations, In Basis Points 0.50%   0.50%    
Due from Related Parties 7,700,000   7,700,000   11,100,000
Commitment to lend 802,000   802,000    
Pacific International Bancorp
         
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans receivable, net $ 117,800,000   $ 117,800,000   $ 112,600,000