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Investment Securities - Amortized Cost and Fair Value, by Contractual Maturity (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Amortized Cost |  |
Due after one year through five years | $ 41,497 |
Due after five years through ten years | 83,608 |
Due after ten years | 57,249 |
Total contractual maturities | 182,354 |
Amortized Cost | 6,951,153 | $ 5,985,031
Fair Value |  |
Due after one year through five years | 41,787 |
Due after five years through ten years | 82,670 |
Due after ten years | 56,315 |
Total contractual maturities | 180,772 |
Fair value | 6,953,930 | 6,071,415
Mortgage-backed securities: |  |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 3,098,785 |
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 3,091,989 |
Residential - Government agency |  |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 110,115 |
Amortized Cost | 110,115 | 155,169
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 113,289 |
Fair value | 113,289 | 160,462
Residential - Government-sponsored enterprises |  |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 1,257,032 |
Amortized Cost | 1,257,032 | 434,282
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 1,263,448 |
Fair value | 1,263,448 | 447,200
Commercial - Government agency |  |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 487,607 |
Amortized Cost | 487,607 | 583,232
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 491,447 |
Fair value | 491,447 | 599,650
Commercial - Government-sponsored enterprises |  |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 1,244,031 |
Amortized Cost | 1,244,031 | 931,095
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 1,223,805 |
Fair value | 1,223,805 | 932,157
Collateralized mortgage obligations |  |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 3,670,014 |
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 3,681,169 |
Government agency |  |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 1,645,170 |
Amortized Cost | 1,645,170 | 1,902,326
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 1,662,134 |
Fair value | 1,662,134 | 1,933,553
Government-sponsored enterprises |  |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 2,024,844 |
Amortized Cost | 2,024,844 | 1,808,804
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 2,019,035 |
Fair value | $ 2,019,035 | $ 1,826,972

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