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Investment Securities - Amortized Cost and Fair Value, by Contractual Maturity (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Amortized Cost |  |
Due after one year through five years | $ 41,481 |
Due after five years through ten years | 83,227 |
Due after ten years | 64,153 |
Total contractual maturities | 188,861 |
Amortized Cost | 7,994,266 | $ 5,985,031
Fair Value |  |
Due after one year through five years | 41,777 |
Due after five years through ten years | 82,733 |
Due after ten years | 63,351 |
Total contractual maturities | 187,861 |
Fair value | 7,953,727 | 6,071,415
Mortgage-backed securities: |  |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 3,337,784 |
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 3,306,855 |
Residential - Government agency |  |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 95,337 |
Amortized Cost | 95,337 | 155,169
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 98,134 |
Fair value | 98,134 | 160,462
Residential - Government-sponsored enterprises |  |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 1,455,375 |
Amortized Cost | 1,455,375 | 434,282
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 1,458,878 |
Fair value | 1,458,878 | 447,200
Commercial - Government agency |  |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 449,147 |
Amortized Cost | 449,147 | 583,232
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 448,594 |
Fair value | 448,594 | 599,650
Commercial - Government-sponsored enterprises |  |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 1,337,925 |
Amortized Cost | 1,337,925 | 931,095
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 1,301,249 |
Fair value | 1,301,249 | 932,157
Collateralized mortgage obligations |  |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 4,467,621 |
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 4,459,011 |
Government agency |  |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 2,053,171 |
Amortized Cost | 2,053,171 | 1,902,326
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 2,059,864 |
Fair value | 2,059,864 | 1,933,553
Government-sponsored enterprises |  |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 2,414,450 |
Amortized Cost | 2,414,450 | 1,808,804
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 2,399,147 |
Fair value | $ 2,399,147 | $ 1,826,972

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