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Investments (Unrealized Losses) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Investment securities available for sale: |  |
Less than 12 months, fair value | $ 2,778,014 | $ 705,526
Less than 12 months, unrealized losses | 16,025 | 3,943
Longer than 12 months, fair value | 332,953 | 2,796,627
Longer than 12 months, unrealized losses | 1,794 | 52,489
Total fair value | 3,110,967 | 3,502,153
Total unrealized losses | 17,819 | 56,432
U. S. Treasury |  |
Investment securities available for sale: |  |
Less than 12 months, fair value |  | 248,983
Less than 12 months, unrealized losses |  | 113
Longer than 12 months, fair value |  | 848,622
Longer than 12 months, unrealized losses |  | 2,053
Total fair value |  | 1,097,605
Total unrealized losses |  | 2,166
Government Agency |  |
Investment securities available for sale: |  |
Less than 12 months, fair value | 347,081 | 115,273
Less than 12 months, unrealized losses | 1,827 | 601
Longer than 12 months, fair value | 63,947 | 2,310
Longer than 12 months, unrealized losses | 414 | 38
Total fair value | 411,028 | 117,583
Total unrealized losses | 2,241 | 639
Residential Mortgage Backed Securities |  |
Investment securities available for sale: |  |
Less than 12 months, fair value | 2,387,293 | 262,204
Less than 12 months, unrealized losses | 14,016 | 2,387
Longer than 12 months, fair value | 264,257 | 1,940,695
Longer than 12 months, unrealized losses | 1,371 | 50,376
Total fair value | 2,651,550 | 2,202,899
Total unrealized losses | 15,387 | 52,763
Investment securities held to maturity: |  |
Less than 12 months, fair value |  | 5,111
Less than 12 months, unrealized losses |  | 181
Longer than 12 months, fair value |  | 10,131
Longer than 12 months, unrealized losses |  | 309
Total fair value |  | 15,242
Total unrealized losses |  | 490
Commercial Mortgage Backed Securities |  |
Investment securities available for sale: |  |
Less than 12 months, fair value | 35,926 |
Less than 12 months, unrealized losses | 59 |
Longer than 12 months, fair value | 0 |
Longer than 12 months, unrealized losses | 0 |
Total fair value | 35,926 |
Total unrealized losses | 59 |
Corporate Bonds |  |
Investment securities available for sale: |  |
Less than 12 months, fair value | 7,714 | 79,066
Less than 12 months, unrealized losses | 123 | 842
Longer than 12 months, fair value | 4,749 | 5,000
Longer than 12 months, unrealized losses | 9 | 22
Total fair value | 12,463 | 84,066
Total unrealized losses | $ 132 | $ 864

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