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Investments with an Unrealized Loss Position (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Available-for-sale, Fair Value |  |
Less than 12 Months | $ 586,721 | $ 1,188,397
12 Months or More | 484,508 | 144,120
Total | 1,071,229 | 1,332,517
Available-for-sale, Unrealized Loss |  |
Less than 12 Months | (4,533) | (16,446)
12 Months or Longer | (11,161) | (5,839)
Total | (15,694) | (22,285)
Held-to-maturity, Fair Value |  |
Less than 12 Months | 21,207 | 117,912
12 Months or More | 105,486 | 86,601
Total | 126,693 | 204,513
Held-to-maturity, Unrealized Loss |  |
Less than 12 Months | (186) | (1,712)
12 Months or More | (8,387) | (6,273)
Total | (8,573) | (7,985)
U.S. government and federal agency |  |
Available-for-sale, Fair Value |  |
Less than 12 Months | 1,208 | 6,718
12 Months or More | 13,179 | 26,239
Total | 14,387 | 32,957
Available-for-sale, Unrealized Loss |  |
Less than 12 Months | (5) | (24)
12 Months or Longer | (138) | (138)
Total | (143) | (162)
U.S. government sponsored enterprises |  |
Available-for-sale, Fair Value |  |
Less than 12 Months | 14,926 | 6,049
12 Months or More | 3,425 | 0
Total | 18,351 | 6,049
Available-for-sale, Unrealized Loss |  |
Less than 12 Months | (56) | (42)
12 Months or Longer | (48) | 0
Total | (104) | (42)
State and local governments |  |
Available-for-sale, Fair Value |  |
Less than 12 Months | 61,126 | 222,700
12 Months or More | 121,181 | 81,783
Total | 182,307 | 304,483
Available-for-sale, Unrealized Loss |  |
Less than 12 Months | (689) | (4,949)
12 Months or Longer | (4,475) | (5,014)
Total | (5,164) | (9,963)
Held-to-maturity, Fair Value |  |
Less than 12 Months | 21,207 | 117,912
12 Months or More | 105,486 | 86,601
Total | 126,693 | 204,513
Held-to-maturity, Unrealized Loss |  |
Less than 12 Months | (186) | (1,712)
12 Months or More | (8,387) | (6,273)
Total | (8,573) | (7,985)
Corporate bonds |  |
Available-for-sale, Fair Value |  |
Less than 12 Months | 99,636 | 174,821
12 Months or More | 29,034 | 6,141
Total | 128,670 | 180,962
Available-for-sale, Unrealized Loss |  |
Less than 12 Months | (264) | (774)
12 Months or Longer | (219) | (19)
Total | (483) | (793)
Residential mortgage backed securities |  |
Available-for-sale, Fair Value |  |
Less than 12 Months | 372,175 | 688,811
12 Months or More | 254,721 | 29,957
Total | 626,896 | 718,768
Available-for-sale, Unrealized Loss |  |
Less than 12 Months | (3,050) | (9,079)
12 Months or Longer | (4,880) | (668)
Total | (7,930) | (9,747)
Commercial mortgage backed securities |  |
Available-for-sale, Fair Value |  |
Less than 12 Months | 37,650 | 89,298
12 Months or More | 62,968 | 0
Total | 100,618 | 89,298
Available-for-sale, Unrealized Loss |  |
Less than 12 Months | (469) | (1,578)
12 Months or Longer | (1,401) | 0
Total | $ (1,870) | $ (1,578)

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