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Investment Securities - Unrealized Gross Losses and Fair Values of Securities in a Continuous Loss Position (Details) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 USD ($) security | Dec. 31, 2017 USD ($) security
Securities in the available-for-sale portfolio in a continuous loss position |  |
Number of individual securities in a continuous loss position | security | 203 | 196
Time in Continuous Loss, Unrealized Losses |  |
Less Than 12 Months Unrealized Losses | $ (62,384) | $ (29,116)
12 Months or Longer Unrealized Losses | (151,730) | (93,742)
Total Unrealized Losses | (214,114) | (122,858)
Time in Continuous Loss, Fair Value |  |
Less Than 12 Months Fair Value | 1,865,793 | 2,119,812
12 Months or Longer Fair Value | 2,971,414 | 3,052,744
Total Fair Value | 4,837,207 | 5,172,556
U.S. Treasury securities |  |
Time in Continuous Loss, Unrealized Losses |  |
Less Than 12 Months Unrealized Losses | (1,963) | (994)
12 Months or Longer Unrealized Losses | (15,724) | (11,127)
Total Unrealized Losses | (17,687) | (12,121)
Time in Continuous Loss, Fair Value |  |
Less Than 12 Months Fair Value | 47,287 | 48,182
12 Months or Longer Fair Value | 338,770 | 344,073
Total Fair Value | 386,057 | 392,255
Government-sponsored enterprises debt securities |  |
Time in Continuous Loss, Unrealized Losses |  |
Less Than 12 Months Unrealized Losses | (1,700) | (642)
12 Months or Longer Unrealized Losses | (9,487) | (6,469)
Total Unrealized Losses | (11,187) | (7,111)
Time in Continuous Loss, Fair Value |  |
Less Than 12 Months Fair Value | 58,300 | 59,358
12 Months or Longer Fair Value | 180,227 | 183,243
Total Fair Value | 238,527 | 242,601
Government agency mortgage-backed securities |  |
Time in Continuous Loss, Unrealized Losses |  |
Less Than 12 Months Unrealized Losses | (8,499) | (976)
12 Months or Longer Unrealized Losses | (8,420) | (4,492)
Total Unrealized Losses | (16,919) | (5,468)
Time in Continuous Loss, Fair Value |  |
Less Than 12 Months Fair Value | 304,708 | 200,963
12 Months or Longer Fair Value | 134,142 | 150,427
Total Fair Value | 438,850 | 351,390
Government-sponsored enterprises mortgage-backed securities |  |
Time in Continuous Loss, Unrealized Losses |  |
Less Than 12 Months Unrealized Losses | (1) | (1)
12 Months or Longer Unrealized Losses | (7,018) | (4,129)
Total Unrealized Losses | (7,019) | (4,130)
Time in Continuous Loss, Fair Value |  |
Less Than 12 Months Fair Value | 189 | 63
12 Months or Longer Fair Value | 155,708 | 168,342
Total Fair Value | 155,897 | 168,405
Collateralized mortgage obligations: Government agency |  |
Time in Continuous Loss, Unrealized Losses |  |
Less Than 12 Months Unrealized Losses | (42,264) | (23,236)
12 Months or Longer Unrealized Losses | (90,796) | (53,510)
Total Unrealized Losses | (133,060) | (76,746)
Time in Continuous Loss, Fair Value |  |
Less Than 12 Months Fair Value | 1,162,582 | 1,473,170
12 Months or Longer Fair Value | 1,762,224 | 1,803,338
Total Fair Value | 2,924,806 | 3,276,508
Collateralized mortgage obligations: Government-sponsored enterprises |  |
Time in Continuous Loss, Unrealized Losses |  |
Less Than 12 Months Unrealized Losses | (7,362) | (3,203)
12 Months or Longer Unrealized Losses | (20,285) | (14,015)
Total Unrealized Losses | (27,647) | (17,218)
Time in Continuous Loss, Fair Value |  |
Less Than 12 Months Fair Value | 272,911 | 327,435
12 Months or Longer Fair Value | 400,343 | 403,321
Total Fair Value | 673,254 | 730,756
States and political subdivisions |  |
Time in Continuous Loss, Unrealized Losses |  |
Less Than 12 Months Unrealized Losses | (595) | (64)
Total Unrealized Losses | (595) | (64)
Time in Continuous Loss, Fair Value |  |
Less Than 12 Months Fair Value | 19,816 | 10,641
Total Fair Value | $ 19,816 | $ 10,641

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