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Investment Securities - Unrealized Gross Losses and Fair Values of Securities in a Continuous Loss Position (Details) $ in Thousands | Sep. 30, 2017 USD ($) security | Dec. 31, 2016 USD ($) security
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Securities in the available-for-sale portfolio in a continuous loss position |  |
Number of individual securities in a continuous loss position | security | 169 | 158
Time in Continuous Loss |  |
Less Than 12 Months Unrealized Losses | $ (19,305) | $ (82,370)
Less Than 12 Months Fair Value | 2,266,486 | 4,086,005
12 Months or Longer Unrealized Losses | (49,709) | (18,715)
12 Months or Longer Fair Value | 2,165,651 | 520,369
Total Unrealized Losses | (69,014) | (101,085)
Total Fair Value | 4,432,137 | 4,606,374
U.S. Treasury securities |  |
Time in Continuous Loss |  |
Less Than 12 Months Unrealized Losses | (802) | (13,164)
Less Than 12 Months Fair Value | 97,031 | 392,473
12 Months or Longer Unrealized Losses | (7,125) |
12 Months or Longer Fair Value | 299,735 |
Total Unrealized Losses | (7,927) | (13,164)
Total Fair Value | 396,766 | 392,473
Government-sponsored enterprises debt securities |  |
Time in Continuous Loss |  |
Less Than 12 Months Unrealized Losses | (1,471) | (7,056)
Less Than 12 Months Fair Value | 111,554 | 207,651
12 Months or Longer Unrealized Losses | (3,128) |
12 Months or Longer Fair Value | 98,558 |
Total Unrealized Losses | (4,599) | (7,056)
Total Fair Value | 210,112 | 207,651
Government agency mortgage-backed securities |  |
Time in Continuous Loss |  |
Less Than 12 Months Unrealized Losses | (2,080) | (4,822)
Less Than 12 Months Fair Value | 111,991 | 185,663
12 Months or Longer Unrealized Losses | (1,422) |
12 Months or Longer Fair Value | 47,796 |
Total Unrealized Losses | (3,502) | (4,822)
Total Fair Value | 159,787 | 185,663
Government-sponsored enterprises mortgage-backed securities |  |
Time in Continuous Loss |  |
Less Than 12 Months Unrealized Losses | (441) | (4,034)
Less Than 12 Months Fair Value | 36,211 | 195,848
12 Months or Longer Unrealized Losses | (2,611) |
12 Months or Longer Fair Value | 141,003 |
Total Unrealized Losses | (3,052) | (4,034)
Total Fair Value | 177,214 | 195,848
Non-government asset-backed securities |  |
Time in Continuous Loss |  |
Less Than 12 Months Unrealized Losses |  | (3)
Less Than 12 Months Fair Value |  | 5,202
12 Months or Longer Unrealized Losses |  | (6)
12 Months or Longer Fair Value |  | 7,381
Total Unrealized Losses |  | (9)
Total Fair Value |  | 12,583
Collateralized mortgage obligations: Government agency |  |
Time in Continuous Loss |  |
Less Than 12 Months Unrealized Losses | (12,237) | (51,484)
Less Than 12 Months Fair Value | 1,589,897 | 2,847,103
12 Months or Longer Unrealized Losses | (26,642) | (7,310)
12 Months or Longer Fair Value | 1,336,841 | 233,706
Total Unrealized Losses | (38,879) | (58,794)
Total Fair Value | 2,926,738 | 3,080,809
Collateralized mortgage obligations: Government-sponsored enterprises |  |
Time in Continuous Loss |  |
Less Than 12 Months Unrealized Losses | (2,274) | (1,807)
Less Than 12 Months Fair Value | 319,802 | 252,065
12 Months or Longer Unrealized Losses | (8,781) | (11,399)
12 Months or Longer Fair Value | 241,718 | 279,282
Total Unrealized Losses | (11,055) | (13,206)
Total Fair Value | $ 561,520 | $ 531,347

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27337-111563 + Details
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