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Investment Securities - Unrealized Gross Losses and Fair Values of Securities in a Continuous Loss Position (Details) $ in Thousands | Jun. 30, 2019 USD ($) security | Dec. 31, 2018 USD ($) 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 | 108 | 154
Time in Continuous Loss, Unrealized Losses |  |
Less Than 12 Months Unrealized Losses | $ (324) | $ (1)
12 Months or More Unrealized Losses | (24,558) | (142,161)
Total Unrealized Losses | (24,882) | (142,162)
Time in Continuous Loss, Fair Value |  |
Less Than 12 Months Fair Value | 215,287 | 172
12 Months or More Fair Value | 2,030,455 | 3,619,406
Total Fair Value | 2,245,742 | 3,619,578
Government-sponsored enterprises debt securities |  |
Time in Continuous Loss, Unrealized Losses |  |
12 Months or More Unrealized Losses | (404) | (6,778)
Total Unrealized Losses | (404) | (6,778)
Time in Continuous Loss, Fair Value |  |
12 Months or More Fair Value | 76,290 | 157,939
Total Fair Value | 76,290 | 157,939
Government agency mortgage-backed securities |  |
Time in Continuous Loss, Unrealized Losses |  |
12 Months or More Unrealized Losses | (3,117) | (15,174)
Total Unrealized Losses | (3,117) | (15,174)
Time in Continuous Loss, Fair Value |  |
12 Months or More Fair Value | 154,670 | 373,891
Total Fair Value | 154,670 | 373,891
Government-sponsored enterprises mortgage-backed securities |  |
Time in Continuous Loss, Unrealized Losses |  |
Less Than 12 Months Unrealized Losses |  | (1)
12 Months or More Unrealized Losses | (1,675) | (5,293)
Total Unrealized Losses | (1,675) | (5,294)
Time in Continuous Loss, Fair Value |  |
Less Than 12 Months Fair Value |  | 172
12 Months or More Fair Value | 120,791 | 125,869
Total Fair Value | 120,791 | 126,041
Collateralized mortgage obligations: Government agency |  |
Time in Continuous Loss, Unrealized Losses |  |
Less Than 12 Months Unrealized Losses | (181) |
12 Months or More Unrealized Losses | (14,963) | (97,171)
Total Unrealized Losses | (15,144) | (97,171)
Time in Continuous Loss, Fair Value |  |
Less Than 12 Months Fair Value | 76,844 |
12 Months or More Fair Value | 1,407,580 | 2,475,532
Total Fair Value | 1,484,424 | 2,475,532
Collateralized mortgage obligations: Government-sponsored enterprises |  |
Time in Continuous Loss, Unrealized Losses |  |
Less Than 12 Months Unrealized Losses | (143) |
12 Months or More Unrealized Losses | (4,399) | (17,745)
Total Unrealized Losses | (4,542) | (17,745)
Time in Continuous Loss, Fair Value |  |
Less Than 12 Months Fair Value | 138,443 |
12 Months or More Fair Value | 271,124 | 486,175
Total Fair Value | $ 409,567 | $ 486,175

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118955579&loc=SL82922890-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=118942371&loc=SL82922954-210456 + Details
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