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Loans Receivable and Allowance for Credit Losses (Composition of Non-PCI and PCI Loans- Narrative) (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
property_unit
Dec. 31, 2017
USD ($)
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES    
Loans receivable pledged to secure borrowings and to provide additional borrowing capacity from the FHLB and the Federal Reserve Bank | $ $ 20,590,035 $ 18,880,598
CRE    
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES    
Percent of a CRE loan serviced by unaffiliated rental income from a third party that deemed non-owner occupied 50.00%  
Consumer Lending | Single-family residential and home equity line of credit    
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES    
Loan to value ratio 60.00%  
Multifamily | Commercial Lending | Minimum    
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES    
Percentage of loan serviced by unaffiliated rental income from a third party 5  
Multifamily | Commercial Lending | Maximum    
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES    
Percentage of loan serviced by unaffiliated rental income from a third party 15