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Loans Receivable - Performing and Nonaccrual TDR (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Receivables [Abstract]      
Unfunded commitment to borrowers related to TDR loans $ 2,600 $ 736  
Interest and fees on loans $ 192,417 $ 189,515 $ 175,466