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Financial Derivatives - Schedule of Derivative Instruments in Statement of Financial Position (Details) - USD ($) $ / shares in Units, $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Notional Disclosures [Abstract] |  |
Notional Amount | $ 15,921,182 | $ 15,447,553
Asset |  |
Asset | 15,668 | 17,468
Collateral (held)/pledged | (2,198) | (1,345)
Net amount | 13,470 | 16,123
(Liability) |  |
(Liability) | (25,633) | (29,892)
Collateral (held)/pledged | 175,189 | 212,263
Financial derivatives | 149,556 | 182,371
Designated as hedge | Fair value hedges: | Pay fixed non-callable |  |
Notional Disclosures [Abstract] |  |
Notional Amount | 5,322,606 | 5,463,303
Asset |  |
Asset | 7,407 | 10,157
(Liability) |  |
(Liability) | $ (770) | $ (2,585)
Weighted- Average Pay Rate | 2.20% | 2.26%
Weighted- Average Receive Rate | 0.12% | 0.21%
Weighted- Average Remaining Term (in years) | 12 years 1 month 17 days | 11 years 11 months 12 days
Designated as hedge | Fair value hedges: | Receive fixed non-callable |  |
Notional Disclosures [Abstract] |  |
Notional Amount | $ 4,748,529 | $ 2,611,029
Asset |  |
Asset | 22 | 2
(Liability) |  |
(Liability) | $ (9,657) | $ (8,755)
Weighted- Average Pay Rate | 0.17% | 0.32%
Weighted- Average Receive Rate | 0.90% | 1.61%
Weighted- Average Remaining Term (in years) | 2 years 2 months 1 day | 2 years 1 month 6 days
Designated as hedge | Fair value hedges: | Receive fixed callable |  |
Notional Disclosures [Abstract] |  |
Notional Amount | $ 1,459,577 | $ 343,500
Asset |  |
Asset | 1,246 | 3,108
(Liability) |  |
(Liability) | $ (5,108) | $ (4)
Weighted- Average Pay Rate | 0.02% | 0.16%
Weighted- Average Receive Rate | 0.73% | 1.78%
Weighted- Average Remaining Term (in years) | 4 years 21 days | 3 years 1 month 28 days
Designated as hedge | Cash flow hedges: | Pay fixed non-callable |  |
Notional Disclosures [Abstract] |  |
Notional Amount | $ 535,000 | $ 472,000
Asset |  |
Asset | 6,121 | 2,584
(Liability) |  |
(Liability) | $ (4,149) | $ (8,771)
Weighted- Average Pay Rate | 1.96% | 2.04%
Weighted- Average Receive Rate | 0.49% | 0.57%
Weighted- Average Remaining Term (in years) | 5 years 8 months 8 days | 6 years 14 days
No hedge designation |  |
Asset |  |
Credit valuation adjustment | $ (30) | $ (1)
(Liability) |  |
Credit valuation adjustment | 12 | 35
No hedge designation | Pay fixed non-callable |  |
Notional Disclosures [Abstract] |  |
Notional Amount | 238,809 | 339,090
Asset |  |
Asset | 0 | 0
(Liability) |  |
(Liability) | $ (5,826) | $ (9,675)
Weighted- Average Pay Rate | 3.31% | 2.38%
Weighted- Average Receive Rate | 0.14% | 0.19%
Weighted- Average Remaining Term (in years) | 4 years 11 months 26 days | 4 years 2 months 23 days
No hedge designation | Receive fixed non-callable |  |
Notional Disclosures [Abstract] |  |
Notional Amount | $ 1,373,250 | $ 2,359,220
Asset |  |
Asset | 0 | 0
(Liability) |  |
(Liability) | $ 0 | $ 0
Weighted- Average Pay Rate | 0.10% | 0.16%
Weighted- Average Receive Rate | 0.50% | 0.87%
Weighted- Average Remaining Term (in years) | 11 months 8 days | 1 year 25 days
No hedge designation | Receive fixed callable |  |
Notional Disclosures [Abstract] |  |
Notional Amount |  | $ 200,000
Asset |  |
Asset |  | 1
(Liability) |  |
(Liability) |  | $ (12)
Weighted- Average Pay Rate |  | 0.13%
Weighted- Average Receive Rate |  | 0.15%
Weighted- Average Remaining Term (in years) |  | 8 months 19 days
No hedge designation | Basis swaps |  |
Notional Disclosures [Abstract] |  |
Notional Amount | $ 2,088,911 | $ 3,628,911
Asset |  |
Asset | 902 | 1,617
(Liability) |  |
(Liability) | $ (135) | $ (43)
Weighted- Average Pay Rate | 0.14% | 0.18%
Weighted- Average Receive Rate | 0.18% | 0.23%
Weighted- Average Remaining Term (in years) | 2 years 9 months 7 days | 2 years 10 days
No hedge designation | Treasury futures |  |
Notional Disclosures [Abstract] |  |
Notional Amount | $ 154,500 | $ 30,500
Asset |  |
Asset | 0 | 0
(Liability) |  |
(Liability) | $ 0 | $ (82)
Weighted- Average Forward Price (in dollars per share) | $ 131.61 | $ 137.81

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