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Investment Securities (Details 2) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Fair Value |  |  |
Less than 12 Months | $ 656,335 |  | $ 497,752
12 months or Longer | 183,611 |  | 184,736
Total fair value | 839,946 |  | 682,488
Unrealized Losses |  |  |
Less than 12 Months | (8,728) |  | (2,841)
12 months or Longer | (7,009) |  | (4,670)
Total unrealized losses | (15,737) |  | (7,511)
Gross realized gains and losses |  |  |
Gross realized gains | 2 | $ 1,285 |
Gross realized losses | (347) | 0 |
OTTI losses | 0 | 0 |
Net realized gains (losses) | (345) | $ 1,285 |
Investment securities pledged as collateral | 262,740 |  | 289,050
U.S. Treasury and Federal agencies securities |  |  |
Fair Value |  |  |
Less than 12 Months | 399,359 |  | 311,865
12 months or Longer | 88,465 |  | 89,617
Total fair value | 487,824 |  | 401,482
Unrealized Losses |  |  |
Less than 12 Months | (4,388) |  | (1,161)
12 months or Longer | (3,361) |  | (2,285)
Total unrealized losses | (7,749) |  | (3,446)
U.S. States and political subdivisions securities |  |  |
Fair Value |  |  |
Less than 12 Months | 46,927 |  | 34,971
12 months or Longer | 18,067 |  | 24,909
Total fair value | 64,994 |  | 59,880
Unrealized Losses |  |  |
Less than 12 Months | (484) |  | (287)
12 months or Longer | (592) |  | (621)
Total unrealized losses | (1,076) |  | (908)
Mortgage-backed securities - Federal agencies |  |  |
Fair Value |  |  |
Less than 12 Months | 175,903 |  | 137,169
12 months or Longer | 67,169 |  | 60,162
Total fair value | 243,072 |  | 197,331
Unrealized Losses |  |  |
Less than 12 Months | (3,672) |  | (1,336)
12 months or Longer | (2,712) |  | (1,537)
Total unrealized losses | (6,384) |  | (2,873)
Corporate debt securities |  |  |
Fair Value |  |  |
Less than 12 Months | 34,146 |  | 13,747
12 months or Longer | 9,910 |  | 10,048
Total fair value | 44,056 |  | 23,795
Unrealized Losses |  |  |
Less than 12 Months | (184) |  | (57)
12 months or Longer | (344) |  | (227)
Total unrealized losses | (528) |  | (284)
Foreign government and other securities |  |  |
Fair Value |  |  |
Less than 12 Months | 0 |  | 0
12 months or Longer | 0 |  | 0
Total fair value | 0 |  | 0
Unrealized Losses |  |  |
Less than 12 Months | 0 |  | 0
12 months or Longer | 0 |  | 0
Total unrealized losses | $ 0 |  | $ 0

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- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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