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Financial Derivatives - Schedule of Derivative Instruments in Statement of Financial Position (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Mar. 31, 2020 | Sep. 30, 2020 | Dec. 31, 2019
Notional Disclosures [Abstract] |  |  |
Notional Amount |  | $ 15,123,582 | $ 14,022,179
Asset |  |  |
Asset |  | 12,837 | 10,519
Collateral (held)/pledged |  | (600) | (2,685)
Net amount |  | 12,237 | 7,834
(Liability) |  |  |
(Liability) |  | (37,357) | (27,042)
Collateral (held)/pledged |  | 225,646 |
Financial derivatives |  | 188,289 | 105,087
Designated as hedge | Fair value hedges: | Pay fixed non-callable |  |  |
Notional Disclosures [Abstract] |  |  |
Notional Amount |  | 5,410,407 | 4,955,686
Asset |  |  |
Asset |  | 5,530 | 7,163
(Liability) |  |  |
(Liability) |  | $ (4,106) | $ (3,281)
Weighted- Average Pay Rate |  | 2.26% | 2.47%
Weighted- Average Receive Rate |  | 0.24% | 1.93%
Weighted- Average Remaining Term (in years) | 11 years 3 months 3 days | 12 years 7 days |
Designated as hedge | Fair value hedges: | Receive fixed non-callable |  |  |
Notional Disclosures [Abstract] |  |  |
Notional Amount |  | $ 2,435,729 | $ 1,413,200
Asset |  |  |
Asset |  | 0 | 76
(Liability) |  |  |
(Liability) |  | $ (11,532) | $ (5,329)
Weighted- Average Pay Rate |  | 0.35% | 1.88%
Weighted- Average Receive Rate |  | 1.75% | 2.13%
Weighted- Average Remaining Term (in years) | 1 year 3 months | 2 years 3 months 3 days |
Designated as hedge | Fair value hedges: | Receive fixed callable |  |  |
Notional Disclosures [Abstract] |  |  |
Notional Amount |  | $ 343,500 | $ 524,000
Asset |  |  |
Asset |  | 4,460 | 476
(Liability) |  |  |
(Liability) |  | $ 0 | $ (772)
Weighted- Average Pay Rate |  | 0.18% | 1.52%
Weighted- Average Receive Rate |  | 1.78% | 1.91%
Weighted- Average Remaining Term (in years) | 2 years 9 months 29 days | 3 years 4 months 28 days |
Designated as hedge | Cash flow hedges: | Pay fixed non-callable |  |  |
Notional Disclosures [Abstract] |  |  |
Notional Amount |  | $ 482,000 | $ 428,000
Asset |  |  |
Asset |  | 1,597 | 1,882
(Liability) |  |  |
(Liability) |  | $ (10,739) | $ (1,514)
Weighted- Average Pay Rate |  | 2.02% | 2.36%
Weighted- Average Receive Rate |  | 0.56% | 2.12%
Weighted- Average Remaining Term (in years) | 5 years 5 months 4 days | 6 years 2 months 1 day |
No hedge designation |  |  |
Asset |  |  |
Credit valuation adjustment |  | $ (2) | $ 0
(Liability) |  |  |
Credit valuation adjustment |  | 92 | 63
No hedge designation | Pay fixed non-callable |  |  |
Notional Disclosures [Abstract] |  |  |
Notional Amount |  | 356,864 | 342,745
Asset |  |  |
Asset |  | 0 | 7
(Liability) |  |  |
(Liability) |  | $ (10,879) | $ (14,046)
Weighted- Average Pay Rate |  | 2.38% | 3.55%
Weighted- Average Receive Rate |  | 0.24% | 2.00%
Weighted- Average Remaining Term (in years) | 5 years 6 months 3 days | 4 years 3 months 3 days |
No hedge designation | Receive fixed non-callable |  |  |
Notional Disclosures [Abstract] |  |  |
Notional Amount |  | $ 2,622,182 | $ 3,124,148
Asset |  |  |
Asset |  | 0 | 49
(Liability) |  |  |
(Liability) |  | $ 0 | $ (1,637)
Weighted- Average Pay Rate |  | 0.16% | 1.88%
Weighted- Average Receive Rate |  | 0.98% | 2.06%
Weighted- Average Remaining Term (in years) | 1 year 7 months 28 days | 8 months 23 days |
No hedge designation | Receive fixed callable |  |  |
Notional Disclosures [Abstract] |  |  |
Notional Amount |  | $ 200,000 | $ 525,000
Asset |  |  |
Asset |  | 1 | 79
(Liability) |  |  |
(Liability) |  | $ (5) | $ (80)
Weighted- Average Pay Rate |  | 0.07% | 1.64%
Weighted- Average Receive Rate |  | 0.08% | 1.68%
Weighted- Average Remaining Term (in years) | 9 months 29 days | 11 months 19 days |
No hedge designation | Basis swaps |  |  |
Notional Disclosures [Abstract] |  |  |
Notional Amount |  | $ 3,268,500 | $ 2,670,000
Asset |  |  |
Asset |  | 1,242 | 787
(Liability) |  |  |
(Liability) |  | $ (188) | $ (395)
Weighted- Average Pay Rate |  | 0.22% | 1.86%
Weighted- Average Receive Rate |  | 0.25% | 1.76%
Weighted- Average Remaining Term (in years) | 10 months 24 days | 1 year 3 months 14 days |
No hedge designation | Treasury futures |  |  |
Notional Disclosures [Abstract] |  |  |
Notional Amount |  | $ 4,400 | $ 39,400
Asset |  |  |
Asset |  | 9 | 0
(Liability) |  |  |
(Liability) |  | $ 0 | $ (51)
Weighted- Average Forward Price (in dollars per share) | $ 128.29 | $ 139.73 |

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