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Loans Receivable and Allowance for Credit Losses (Schedule of Fair Value for Available For Sale Debt Securities) (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Amortized cost $ 1,067,874 $ 965,135  
Gross unrealized gains 33,795 12,932  
Gross unrealized losses (1,278) (1,148)  
Available for sale debt securities, at fair value 1,100,391 976,919  
Agency Obligations      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Amortized cost     $ 1,081
Gross unrealized gains     4
Gross unrealized losses     (1)
Available for sale debt securities, at fair value     $ 1,084
Mortgage-Backed Securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Amortized cost 903,628 936,196  
Gross unrealized gains 31,407 12,367  
Gross unrealized losses (864) (1,133)  
Available for sale debt securities, at fair value 934,171 947,430  
Asset-backed securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Amortized cost 53,018    
Gross unrealized gains 877    
Gross unrealized losses (27)    
Available for sale debt securities, at fair value 53,868    
State And Municipal Obligations      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Amortized cost 69,931 3,907  
Gross unrealized gains 918 172  
Gross unrealized losses (331) 0  
Available for sale debt securities, at fair value 70,518 4,079  
Corporate Obligations      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Amortized cost 40,216 25,032  
Gross unrealized gains 589 393  
Gross unrealized losses (55) (15)  
Available for sale debt securities, at fair value $ 40,750 $ 25,410