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Investment Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Available for sale debt securities |  |
Amortized Cost | $ 4,143,124 | $ 4,640,419
Unrealized Gains | 27,631 | 85
Unrealized Losses | (13,673) | (142,162)
Fair value | 4,157,082 | 4,498,342
U.S. Treasury securities |  |
Available for sale debt securities |  |
Amortized Cost | 29,653 | 389,470
Unrealized Gains | 85 |
Fair value | 29,738 | 389,470
Government agency debt securities |  |
Available for sale debt securities |  |
Amortized Cost | 24,387 |
Unrealized Gains | 85 |
Fair value | 24,472 |
Government-sponsored enterprises debt securities |  |
Available for sale debt securities |  |
Amortized Cost | 126,696 | 248,372
Unrealized Gains | 28 |
Unrealized Losses | (75) | (6,778)
Fair value | 126,649 | 241,594
Government agency mortgage-backed securities |  |
Available for sale debt securities |  |
Amortized Cost | 342,326 | 426,710
Unrealized Gains | 2,738 |
Unrealized Losses | (1,159) | (15,174)
Fair value | 343,905 | 411,536
Government-sponsored enterprises mortgage-backed securities |  |
Available for sale debt securities |  |
Amortized Cost | 366,346 | 156,056
Unrealized Gains | 6,831 | 85
Unrealized Losses | (1,228) | (5,294)
Fair value | 371,949 | 150,847
Collateralized mortgage obligations: Government agency |  |
Available for sale debt securities |  |
Amortized Cost | 2,479,961 | 2,779,620
Unrealized Gains | 13,900 |
Unrealized Losses | (7,337) | (97,171)
Fair value | 2,486,524 | 2,682,449
Collateralized mortgage obligations: Government-sponsored enterprises |  |
Available for sale debt securities |  |
Amortized Cost | 773,755 | 620,337
Unrealized Gains | 3,964 |
Unrealized Losses | (3,874) | (17,745)
Fair value | $ 773,845 | 602,592
Debt securities issued by states and political subdivisions |  |
Available for sale debt securities |  |
Amortized Cost |  | 19,854
Fair value |  | $ 19,854

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 + Details
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