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Interest Income (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Banking and Thrift, Interest [Abstract]    
Interest on Unpaid Principal Balance $ 123,434 $ 98,755
Amortization of net deferred origination costs (17,700) (12,407)
Interest income on loans, net 105,734 86,348
Interest on deposits and investments 257 21
Total interest income $ 105,991 $ 86,369