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Investment Securities - Contractual Maturity (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Amortized Cost |  |
Due in one year or less | $ 29,653 |
Due after one year through five years | 126,696 |
Total contractual maturities | 156,349 |
Amortized Cost | 4,143,124 | $ 4,640,419
Fair Value |  |
Due in one year or less | 29,738 |
Due after one year through five years | 126,649 |
Total contractual maturities | 156,387 |
Fair value | 4,157,082 | 4,498,342
Government agency debt securities |  |
Amortized Cost |  |
Government debt securities, mortgaged-backed securities and obligations | 24,387 |
Amortized Cost | 24,387 |
Fair Value |  |
Government debt securities, mortgaged-backed securities and collateralized mortgage obligations | 24,472 |
Fair value | 24,472 |
Government agency mortgage-backed securities |  |
Amortized Cost |  |
Government debt securities, mortgaged-backed securities and obligations | 342,326 |
Amortized Cost | 342,326 | 426,710
Fair Value |  |
Government debt securities, mortgaged-backed securities and collateralized mortgage obligations | 343,905 |
Fair value | 343,905 | 411,536
Government-sponsored enterprises mortgage-backed securities |  |
Amortized Cost |  |
Government debt securities, mortgaged-backed securities and obligations | 366,346 |
Amortized Cost | 366,346 | 156,056
Fair Value |  |
Government debt securities, mortgaged-backed securities and collateralized mortgage obligations | 371,949 |
Fair value | 371,949 | 150,847
Collateralized mortgage obligations: Government agency |  |
Amortized Cost |  |
Government debt securities, mortgaged-backed securities and obligations | 2,479,961 |
Amortized Cost | 2,479,961 | 2,779,620
Fair Value |  |
Government debt securities, mortgaged-backed securities and collateralized mortgage obligations | 2,486,524 |
Fair value | 2,486,524 | 2,682,449
Collateralized mortgage obligations: Government-sponsored enterprises |  |
Amortized Cost |  |
Government debt securities, mortgaged-backed securities and obligations | 773,755 |
Amortized Cost | 773,755 | 620,337
Fair Value |  |
Government debt securities, mortgaged-backed securities and collateralized mortgage obligations | 773,845 |
Fair value | 773,845 | $ 602,592
Collateralized mortgage obligations |  |
Amortized Cost |  |
Government debt securities, mortgaged-backed securities and obligations | 3,253,716 |
Fair Value |  |
Government debt securities, mortgaged-backed securities and collateralized mortgage obligations | $ 3,260,369 |

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