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Borrowings - FHLB and FRB Advances (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Debt Disclosure [Abstract]    
FHLB advances $ 350,000 $ 0
FHLB advances, interest rate 2.36% 0.00%
Total long-term debt $ 350,000 $ 0
Total maximum borrowing capacity with the FHLB 3,445,416 4,146,899
Total maximum borrowing capacity with the FRB 136,842 102,461
Qualifying loans serving as collateral against FHLB and FRB advances $ 4,496,983 $ 5,221,957