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Borrowings - FHLB and FRB Advances (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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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

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