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Loans Receivable - Fair Value of Loans Acquired (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
loan
Dec. 31, 2017
USD ($)
Jan. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Less: Accretable yield $ (9,620) $ (42,435)   $ (52,572) $ (66,639)
PCI Loans          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Number of loans acquired | loan 0        
PCI Loans | Loans Acquired through Consolidation          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Contractually required payments including interest     $ 1,154,596    
Less: Nonaccretable difference     (878,257)    
Cash flows expected to be collected     276,339    
Less: Accretable yield     (23,594)    
Fair value of loans acquired     $ 252,745