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Fair Value - Assets and Liabilities Recorded at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Assets |  |
Fair value | $ 7,953,727 | $ 6,071,415
Fair Value Measurements, Recurring |  |
Assets |  |
Fair value | 7,953,727 | 6,071,415
Other assets | 75,377 | 141,586
Liabilities |  |
Other liabilities | (1,708) | (5,837)
Total |  |
Net Assets (Liabilities) | 8,027,396 | 6,207,164
Fair Value Measurements, Recurring | Level 1 |  |
Assets |  |
Other assets | 7,327 | 11,691
Total |  |
Net Assets (Liabilities) | 7,327 | 11,691
Fair Value Measurements, Recurring | Level 2 |  |
Assets |  |
Fair value | 7,953,727 | 6,071,415
Other assets | 68,050 | 129,895
Liabilities |  |
Other liabilities | (856) | (1,283)
Total |  |
Net Assets (Liabilities) | 8,020,921 | 6,200,027
Fair Value Measurements, Recurring | Level 3 |  |
Liabilities |  |
Other liabilities | (852) | (4,554)
Total |  |
Net Assets (Liabilities) | (852) | (4,554)
U.S. Treasury and government agency debt securities |  |
Assets |  |
Fair value | 187,861 | 171,421
U.S. Treasury and government agency debt securities | Fair Value Measurements, Recurring |  |
Assets |  |
Fair value | 187,861 | 171,421
U.S. Treasury and government agency debt securities | Fair Value Measurements, Recurring | Level 2 |  |
Assets |  |
Fair value | 187,861 | 171,421
Residential - Government agency |  |
Assets |  |
Fair value | 98,134 | 160,462
Residential - Government agency | Fair Value Measurements, Recurring |  |
Assets |  |
Fair value | 98,134 | 160,462
Residential - Government agency | Fair Value Measurements, Recurring | Level 2 |  |
Assets |  |
Fair value | 98,134 | 160,462
Residential - Government-sponsored enterprises |  |
Assets |  |
Fair value | 1,458,878 | 447,200
Residential - Government-sponsored enterprises | Fair Value Measurements, Recurring |  |
Assets |  |
Fair value | 1,458,878 | 447,200
Residential - Government-sponsored enterprises | Fair Value Measurements, Recurring | Level 2 |  |
Assets |  |
Fair value | 1,458,878 | 447,200
Commercial - Government agency |  |
Assets |  |
Fair value | 448,594 | 599,650
Commercial - Government agency | Fair Value Measurements, Recurring |  |
Assets |  |
Fair value | 448,594 | 599,650
Commercial - Government agency | Fair Value Measurements, Recurring | Level 2 |  |
Assets |  |
Fair value | 448,594 | 599,650
Commercial - Government-sponsored enterprises |  |
Assets |  |
Fair value | 1,301,249 | 932,157
Commercial - Government-sponsored enterprises | Fair Value Measurements, Recurring |  |
Assets |  |
Fair value | 1,301,249 | 932,157
Commercial - Government-sponsored enterprises | Fair Value Measurements, Recurring | Level 2 |  |
Assets |  |
Fair value | 1,301,249 | 932,157
Government agency |  |
Assets |  |
Fair value | 2,059,864 | 1,933,553
Government agency | Fair Value Measurements, Recurring |  |
Assets |  |
Fair value | 2,059,864 | 1,933,553
Government agency | Fair Value Measurements, Recurring | Level 2 |  |
Assets |  |
Fair value | 2,059,864 | 1,933,553
Government-sponsored enterprises |  |
Assets |  |
Fair value | 2,399,147 | 1,826,972
Government-sponsored enterprises | Fair Value Measurements, Recurring |  |
Assets |  |
Fair value | 2,399,147 | 1,826,972
Government-sponsored enterprises | Fair Value Measurements, Recurring | Level 2 |  |
Assets |  |
Fair value | $ 2,399,147 | $ 1,826,972

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