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Loans Receivable (excluding Covered Loans) - Interest Rate Terms (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Loans at fixed-rate $ 6,210,308
Loans at adjustable-rate 2,459,409
Within 1 year
  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Loans at fixed-rate 366,988
Loans at adjustable-rate 1,167,059
1 to 3 years
  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Loans at fixed-rate 189,917
Loans at adjustable-rate 562,839
3 to 5 years
  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Loans at fixed-rate 100,854
Loans at adjustable-rate 713,975
5 to 10 years
  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Loans at fixed-rate 127,292
Loans at adjustable-rate 12,884
10 to 20 years
  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Loans at fixed-rate 819,570
Loans at adjustable-rate 0
Over 20 years
  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Loans at fixed-rate 4,605,687
Loans at adjustable-rate $ 2,652