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Multifamily Loans - Product Types and Characteristics of Multifamily Loans (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
loan
Dec. 31, 2017
USD ($)
loan
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Loans | loan 1,486 2,013
Total Principal $ 1,034,434 $ 1,409,179
30-89 Days DQ 559 1,913
90 Days DQ $ 747 $ 459
Multifamily loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Loans | loan 162 0
Total Principal $ 2,126,698  
30-89 Days DQ 0  
90 Days DQ 0  
Multifamily loans | $1,001 to $10,000    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loan Balance, minimum 1,000  
Loan Balance, maximum $ 10,000  
Number of Loans | loan 70  
Total Principal $ 394,373  
30-89 Days DQ 0  
90 Days DQ $ 0  
Multifamily loans | $1,001 to $10,000 | Minimum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 3.29%  
Multifamily loans | $1,001 to $10,000 | Maximum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 4.73%  
Multifamily loans | $10,001 to $20,000    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loan Balance, minimum $ 10,001  
Loan Balance, maximum $ 20,000  
Number of Loans | loan 66  
Total Principal $ 960,992  
30-89 Days DQ 0  
90 Days DQ $ 0  
Multifamily loans | $10,001 to $20,000 | Minimum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 3.54%  
Multifamily loans | $10,001 to $20,000 | Maximum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 4.61%  
Multifamily loans | $20,001 to $30,000    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loan Balance, minimum $ 20,001  
Loan Balance, maximum $ 30,000  
Number of Loans | loan 16  
Total Principal $ 373,036  
30-89 Days DQ 0  
90 Days DQ $ 0  
Multifamily loans | $20,001 to $30,000 | Minimum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 3.65%  
Multifamily loans | $20,001 to $30,000 | Maximum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 4.72%  
Multifamily loans | $30,001 to $40,000    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loan Balance, minimum $ 30,001  
Loan Balance, maximum $ 40,000  
Number of Loans | loan 7  
Total Principal $ 244,074  
30-89 Days DQ 0  
90 Days DQ $ 0  
Multifamily loans | $30,001 to $40,000 | Minimum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 3.62%  
Multifamily loans | $30,001 to $40,000 | Maximum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 4.71%  
Multifamily loans | Over $40,000    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loan Balance, maximum $ 40,000  
Number of Loans | loan 3  
Total Principal $ 154,223  
30-89 Days DQ 0  
90 Days DQ $ 0  
Multifamily loans | Over $40,000 | Minimum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 3.74%  
Multifamily loans | Over $40,000 | Maximum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 4.18%