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v3.19.3.a.u2

Short-Term Borrowings (Narrative) (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 USD ($) loan item | Dec. 31, 2018 USD ($)
Short-term Debt [Line Items] |  |
Short-term borrowings | $ 2,714,872 | $ 1,589,128
FHLB Borrowings [Member] |  |
Short-term Debt [Line Items] |  |
Short-term borrowings | $ 2,035,000 | $ 1,160,104
FHLB Borrowings [Member] | FHLB Borrowings, 2 Notes, 1 Fixed and 1 Variable Rate Notes [Member] | Fixed-rate Term Notes [Member] |  |
Short-term Debt [Line Items] |  |
Number of fixed rate short-term borrowings | item | 1 |
FHLB Borrowings [Member] | FHLB Borrowings, 2 Notes, 1 Fixed and 1 Variable Rate Notes [Member] | Fixed and Variable Rate Term Notes [Member] |  |
Short-term Debt [Line Items] |  |
Short-term borrowings | $ 775,000 |
Short-term maturity year | 2020 |
FHLB Borrowings [Member] | FHLB Borrowings, 2 Notes, 1 Fixed and 1 Variable Rate Notes [Member] | Variable-rate Term Notes [Member] |  |
Short-term Debt [Line Items] |  |
Number of variable rate short-term borrowings | loan | 1 |
FHLB Borrowings [Member] | FHLB Borrowings, 3 Fixed Rate Notes [Member] | Fixed-rate Term Notes [Member] |  |
Short-term Debt [Line Items] |  |
Short-term borrowings | $ 800,000 |
Number of fixed rate short-term borrowings | item | 3 |
Short-term maturity year | 2034 |
FHLB Borrowings [Member] | FHLB Borrowings, 4 Variable Rate Notes [Member] | Variable-rate Term Notes [Member] |  |
Short-term Debt [Line Items] |  |
Short-term borrowings | $ 460,000 |
Number of variable rate short-term borrowings | loan | 4 |
FHLB Borrowings [Member] | FHLB Borrowings, 4 Variable Rate Notes [Member] | Variable-rate Term Notes [Member] | Debt Due 2025 [Member] |  |
Short-term Debt [Line Items] |  |
Short-term maturity year | 2025 |
FHLB Borrowings [Member] | FHLB Borrowings, 4 Variable Rate Notes [Member] | Variable-rate Term Notes [Member] | Debt Due 2026 [Member] |  |
Short-term Debt [Line Items] |  |
Short-term maturity year | 2026 |

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