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Loans Receivable and Allowance for Credit Losses (Accretable Yield for PCI Loans) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2020
Jan. 01, 2020
Dec. 31, 2017
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES          
Allowance for loan losses $ 358,287 $ 311,322 $ 619,983   $ 287,128
Accounting Standards Update 2016-13          
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES          
Allowance for loan losses       $ 125,200  
PCI Loans          
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES          
Allowance for loan losses 0        
Changes in the accretable yield for the PCI loans          
Accretable yield for PCI loans, beginning of period 74,870 101,977      
Accretion (24,220) (34,662)      
Changes in expected cash flows (140) 7,555      
Accretable yield for PCI loans, ending of period $ 50,510 $ 74,870      
PCI Loans | Accounting Standards Update 2016-13          
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES          
Allowance for loan losses       $ 1,200