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Federal Home Loan Bank Advances and Long-Term Debt (FHLB Advances) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Debt Instrument [Line Items] |  |
FHLB advances | $ 745,915 | $ 326,172
Available borrowing capacity from FHLB advances | $ 6,830,000 | $ 6,110,000
FHLB Advances |  |
Debt Instrument [Line Items] |  |
Weighted-average rate (as a percent) | 2.19% | 2.87%
FHLB advances that will mature in the next five years |  |
2020 | $ 100,000 |
2021 | 400,000 |
2022 | $ 245,900 |
FHLB Advances | Minimum |  |
Debt Instrument [Line Items] |  |
Variable interest rate | 1.82% | 1.79%
FHLB Advances | Maximum |  |
Debt Instrument [Line Items] |  |
Variable interest rate | 3.13% | 2.98%

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- Definition Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 + Details
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