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Borrowings - Schedule of Long-term Borrowings (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Subordinated debt obligations $ 583,312 $ 586,145
Discounted lease rentals 73,222 75,770
Total long-term borrowings 1,518,816 1,374,732
FHLB advances    
Debt Instrument [Line Items]    
FHLB advances 859,335 709,848
Finance lease obligation    
Debt Instrument [Line Items]    
Finance lease obligation $ 2,947 $ 2,969