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Loans Receivable and Allowance for Loan Losses - Additional Information (Details) (USD $)
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Receivables [Abstract]      
Loans receivable, net $ 5,125,095,000   $ 5,006,856,000
Recognized provision for credit losses related to unfunded commitments 41,000 0  
Positive or Negative Qualitative Adjustment of the Loss Migration Ratio or Individual Specific Reserve Allocations, In Basis Points 0.50%    
Due from Related Parties 5,000,000   3,900,000
Commitment to lend $ 926,000   $ 885,000