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Financial Derivatives - Schedule of Derivative Instruments in Statement of Financial Position (Details) - USD ($) $ / shares in Units, $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 | Dec. 31, 2020
Notional Disclosures [Abstract] |  |
Notional Amount | $ 15,988,366 | $ 15,447,553
Asset |  |
Asset | 16,224 | 17,468
Collateral (held)/pledged | (2,601) | (1,345)
Net amount | 13,623 | 16,123
(Liability) |  |
(Liability) | (24,347) | (29,892)
Collateral (held)/pledged | 177,228 | 212,263
Financial derivatives | 152,881 | 182,371
Designated as hedge | Fair value hedges: | Pay fixed non-callable |  |
Notional Disclosures [Abstract] |  |
Notional Amount | 5,450,448 | 5,463,303
Asset |  |
Asset | 7,863 | 10,157
(Liability) |  |
(Liability) | $ (679) | $ (2,585)
Weighted- Average Pay Rate | 2.24% | 2.26%
Weighted- Average Receive Rate | 0.15% | 0.21%
Weighted- Average Remaining Term (in years) | 11 years 9 months 21 days | 11 years 11 months 12 days
Designated as hedge | Fair value hedges: | Receive fixed non-callable |  |
Notional Disclosures [Abstract] |  |
Notional Amount | $ 4,213,029 | $ 2,611,029
Asset |  |
Asset | 64 | 2
(Liability) |  |
(Liability) | $ (8,191) | $ (8,755)
Weighted- Average Pay Rate | 0.20% | 0.32%
Weighted- Average Receive Rate | 0.97% | 1.61%
Weighted- Average Remaining Term (in years) | 2 years 2 months 26 days | 2 years 1 month 6 days
Designated as hedge | Fair value hedges: | Receive fixed callable |  |
Notional Disclosures [Abstract] |  |
Notional Amount | $ 1,067,577 | $ 343,500
Asset |  |
Asset | 1,529 | 3,108
(Liability) |  |
(Liability) | $ (3,538) | $ (4)
Weighted- Average Pay Rate | 0.04% | 0.16%
Weighted- Average Receive Rate | 0.81% | 1.78%
Weighted- Average Remaining Term (in years) | 4 years 2 months 15 days | 3 years 1 month 28 days
Designated as hedge | Cash flow hedges: | Pay fixed non-callable |  |
Notional Disclosures [Abstract] |  |
Notional Amount | $ 528,000 | $ 472,000
Asset |  |
Asset | 5,572 | 2,584
(Liability) |  |
(Liability) | $ (5,008) | $ (8,771)
Weighted- Average Pay Rate | 1.98% | 2.04%
Weighted- Average Receive Rate | 0.51% | 0.57%
Weighted- Average Remaining Term (in years) | 5 years 11 months 4 days | 6 years 14 days
No hedge designation |  |
Asset |  |
Credit valuation adjustment | $ (19) | $ (1)
(Liability) |  |
Credit valuation adjustment | 22 | 35
No hedge designation | Pay fixed non-callable |  |
Notional Disclosures [Abstract] |  |
Notional Amount | 338,951 | 339,090
Asset |  |
Asset | 0 | 0
(Liability) |  |
(Liability) | $ (6,786) | $ (9,675)
Weighted- Average Pay Rate | 2.38% | 2.38%
Weighted- Average Receive Rate | 0.14% | 0.19%
Weighted- Average Remaining Term (in years) | 3 years 8 months 23 days | 4 years 2 months 23 days
No hedge designation | Receive fixed non-callable |  |
Notional Disclosures [Abstract] |  |
Notional Amount | $ 1,747,850 | $ 2,359,220
Asset |  |
Asset | 0 | 0
(Liability) |  |
(Liability) | $ 0 | $ 0
Weighted- Average Pay Rate | 0.13% | 0.16%
Weighted- Average Receive Rate | 0.61% | 0.87%
Weighted- Average Remaining Term (in years) | 9 months 25 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 | $ 2,608,911 | $ 3,628,911
Asset |  |
Asset | 1,215 | 1,617
(Liability) |  |
(Liability) | $ (79) | $ (43)
Weighted- Average Pay Rate | 0.14% | 0.18%
Weighted- Average Receive Rate | 0.19% | 0.23%
Weighted- Average Remaining Term (in years) | 2 years 5 months 8 days | 2 years 10 days
No hedge designation | Treasury futures |  |
Notional Disclosures [Abstract] |  |
Notional Amount | $ 33,600 | $ 30,500
Asset |  |
Asset | 0 | 0
(Liability) |  |
(Liability) | $ (88) | $ (82)
Weighted- Average Forward Price (in dollars per share) | $ 132.24 | $ 137.81

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