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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 | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019
Notional Disclosures [Abstract] |  |
Notional Amount | $ 14,991,653 | $ 14,022,179
Fair Value |  |
Asset | 12,692 | 10,519
Collateral (held)/pledged | (2,525) | (2,685)
Net amount | 10,167 | 7,834
(Liability) | (53,795) | (27,042)
Collateral (held)/pledged | 225,404 | 132,129
Net amount | 171,609 | 105,087
Designated as Hedging Instrument | Fair value hedges: | Pay fixed non-callable |  |
Notional Disclosures [Abstract] |  |
Notional Amount | 5,099,293 | 4,955,686
Fair Value |  |
Asset | 4,339 | 7,163
(Liability) | $ (6,583) | $ (3,281)
Weighted- Average Pay Rate | 2.42% | 2.47%
Weighted- Average Receive Rate | 1.54% | 1.93%
Weighted- Average Remaining Term (in years) | 11 years 7 months 20 days | 11 years 3 months 3 days
Designated as Hedging Instrument | Fair value hedges: | Receive fixed non-callable |  |
Notional Disclosures [Abstract] |  |
Notional Amount | $ 2,201,500 | $ 1,413,200
Fair Value |  |
Asset | 1,303 | 76
(Liability) | $ (9,730) | $ (5,329)
Weighted- Average Pay Rate | 1.66% | 1.88%
Weighted- Average Receive Rate | 2.06% | 2.13%
Weighted- Average Remaining Term (in years) | 2 years 2 months 19 days | 1 year 3 months
Designated as Hedging Instrument | Fair value hedges: | Receive fixed callable |  |
Notional Disclosures [Abstract] |  |
Notional Amount | $ 413,000 | $ 524,000
Fair Value |  |
Asset | 4,954 | 476
(Liability) | $ (26) | $ (772)
Weighted- Average Pay Rate | 1.36% | 1.52%
Weighted- Average Receive Rate | 1.95% | 1.91%
Weighted- Average Remaining Term (in years) | 3 years 4 months 17 days | 2 years 9 months 29 days
Designated as Hedging Instrument | Cash flow hedges: | Pay fixed non-callable |  |
Notional Disclosures [Abstract] |  |
Notional Amount | $ 458,000 | $ 428,000
Fair Value |  |
Asset | 1,434 | 1,882
(Liability) | $ (11,391) | $ (1,514)
Weighted- Average Pay Rate | 2.31% | 2.36%
Weighted- Average Receive Rate | 1.22% | 2.12%
Weighted- Average Remaining Term (in years) | 5 years 4 months 9 days | 5 years 5 months 4 days
Not Designated as Hedging Instrument |  |
Fair Value |  |
Credit valuation adjustment | $ 0 | $ 0
Credit valuation adjustment | 117 | 63
Not Designated as Hedging Instrument | Pay fixed non-callable |  |
Notional Disclosures [Abstract] |  |
Notional Amount | 339,721 | 342,745
Fair Value |  |
Asset | 0 | 7
(Liability) | $ (22,683) | $ (14,046)
Weighted- Average Pay Rate | 3.54% | 3.55%
Weighted- Average Receive Rate | 1.69% | 2.00%
Weighted- Average Remaining Term (in years) | 5 years 3 months 25 days | 5 years 6 months 3 days
Not Designated as Hedging Instrument | Receive fixed non-callable |  |
Notional Disclosures [Abstract] |  |
Notional Amount | $ 3,111,639 | $ 3,124,148
Fair Value |  |
Asset | 0 | 49
(Liability) | $ 0 | $ (1,637)
Weighted- Average Pay Rate | 1.17% | 1.88%
Weighted- Average Receive Rate | 1.39% | 2.06%
Weighted- Average Remaining Term (in years) | 1 year 3 days | 1 year 7 months 28 days
Not Designated as Hedging Instrument | Receive fixed callable |  |
Notional Disclosures [Abstract] |  |
Notional Amount | $ 500,000 | $ 525,000
Fair Value |  |
Asset | 604 | 79
(Liability) | $ 0 | $ (80)
Weighted- Average Pay Rate | 1.52% | 1.64%
Weighted- Average Receive Rate | 1.75% | 1.68%
Weighted- Average Remaining Term (in years) | 10 months 9 days | 9 months 29 days
Not Designated as Hedging Instrument | Basis swaps |  |
Notional Disclosures [Abstract] |  |
Notional Amount | $ 2,850,000 | $ 2,670,000
Fair Value |  |
Asset | 58 | 787
(Liability) | $ (3,385) | $ (395)
Weighted- Average Pay Rate | 1.49% | 1.86%
Weighted- Average Receive Rate | 0.66% | 1.76%
Weighted- Average Remaining Term (in years) | 10 months 28 days | 10 months 24 days
Not Designated as Hedging Instrument | Treasury futures |  |
Notional Disclosures [Abstract] |  |
Notional Amount | $ 18,500 | $ 39,400
Fair Value |  |
Asset |  | 0
(Liability) | $ (114) | $ (51)
Weighted- Average Forward Price (in dollars per share) | $ 138.07 | $ 128.29

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