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Investment Securities - Contractual Maturity (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Amortized Cost |  |
Due in one year or less | $ 29,477 |
Due after one year through five years | 99,992 |
Due after five years through ten years | 64,727 |
Total contractual maturities | 194,196 |
Amortized Cost | 4,399,597 | $ 4,640,419
Fair Value |  |
Due in one year or less | 29,556 |
Due after one year through five years | 99,701 |
Due after five years through ten years | 64,615 |
Total contractual maturities | 193,872 |
Fair value | 4,395,476 | 4,498,342
Government agency debt securities |  |
Amortized Cost |  |
Government debt securities, mortgaged-backed securities and obligations | 24,583 |
Amortized Cost | 24,583 |
Fair Value |  |
Government debt securities, mortgaged-backed securities and collateralized mortgage obligations | 24,713 |
Fair value | 24,713 |
Government-sponsored enterprises debt securities |  |
Amortized Cost |  |
Amortized Cost | 164,719 | 248,372
Fair Value |  |
Fair value | 164,316 | 241,594
Government agency mortgage-backed securities |  |
Amortized Cost |  |
Government debt securities, mortgaged-backed securities and obligations | 363,295 |
Amortized Cost | 363,295 | 426,710
Fair Value |  |
Government debt securities, mortgaged-backed securities and collateralized mortgage obligations | 362,221 |
Fair value | 362,221 | 411,536
Government-sponsored enterprises mortgage-backed securities |  |
Amortized Cost |  |
Government debt securities, mortgaged-backed securities and obligations | 152,506 |
Amortized Cost | 152,506 | 156,056
Fair Value |  |
Government debt securities, mortgaged-backed securities and collateralized mortgage obligations | 151,683 |
Fair value | 151,683 | 150,847
Collateralized mortgage obligations: Government agency |  |
Amortized Cost |  |
Government debt securities, mortgaged-backed securities and obligations | 2,619,502 |
Amortized Cost | 2,619,502 | 2,779,620
Fair Value |  |
Government debt securities, mortgaged-backed securities and collateralized mortgage obligations | 2,613,465 |
Fair value | 2,613,465 | 2,682,449
Collateralized mortgage obligations: Government-sponsored enterprises |  |
Amortized Cost |  |
Government debt securities, mortgaged-backed securities and obligations | 1,045,515 |
Amortized Cost | 1,045,515 | 620,337
Fair Value |  |
Government debt securities, mortgaged-backed securities and collateralized mortgage obligations | 1,049,522 |
Fair value | 1,049,522 | $ 602,592
Collateralized mortgage obligations |  |
Amortized Cost |  |
Government debt securities, mortgaged-backed securities and obligations | 3,665,017 |
Fair Value |  |
Government debt securities, mortgaged-backed securities and collateralized mortgage obligations | $ 3,662,987 |

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