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Borrowings - Schedule of Long-term Borrowings (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Subordinated debt obligations $ 586,729 $ 428,470
Discounted lease rentals 71,738 100,882
Total long-term borrowings 871,845 2,354,448
FHLB Advances Due 2020-2025    
Debt Instrument [Line Items]    
FHLB advances 210,372 1,822,058
Finance Lease Obligation Due 2038    
Debt Instrument [Line Items]    
Finance lease obligation $ 3,006 $ 3,038