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Borrowings - Schedule of Long-term Borrowings (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Subordinated debt obligations $ 437,504 $ 428,470
Discounted lease rentals 88,593 100,882
Long-term Debt and Lease Obligation 2,600,594 2,354,448
FHLB Advances Due 2020-2025    
Debt Instrument [Line Items]    
FHLB advances 2,071,480 1,822,058
Finance Lease Obligation Due 2038    
Debt Instrument [Line Items]    
Finance lease obligation $ 3,017 $ 3,038