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Debt Securities with an Unrealized Loss Position (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Available-for-sale, Fair Value |  |
Less than 12 Months | $ 1,024,817 | $ 586,721
12 Months or More | 456,803 | 484,508
Total | 1,481,620 | 1,071,229
Available-for-sale, Unrealized Loss |  |
Less than 12 Months | (16,569) | (4,533)
12 Months or More | (18,215) | (11,161)
Total | (34,784) | (15,694)
Held-to-maturity, Fair Value |  |
Less than 12 Months | 169,956 | 21,207
12 Months or More | 90,783 | 105,486
Total | 260,739 | 126,693
Held-to-maturity, Unrealized Loss |  |
Less than 12 Months | (4,092) | (186)
12 Months or More | (7,690) | (8,387)
Total | (11,782) | (8,573)
U.S. government and federal agency |  |
Available-for-sale, Fair Value |  |
Less than 12 Months | 13,466 | 1,208
12 Months or More | 12,602 | 13,179
Total | 26,068 | 14,387
Available-for-sale, Unrealized Loss |  |
Less than 12 Months | (132) | (5)
12 Months or More | (168) | (138)
Total | (300) | (143)
U.S. government sponsored enterprises |  |
Available-for-sale, Fair Value |  |
Less than 12 Months | 87,972 | 14,926
12 Months or More | 3,388 | 3,425
Total | 91,360 | 18,351
Available-for-sale, Unrealized Loss |  |
Less than 12 Months | (487) | (56)
12 Months or More | (87) | (48)
Total | (574) | (104)
State and local governments |  |
Available-for-sale, Fair Value |  |
Less than 12 Months | 191,317 | 61,126
12 Months or More | 114,556 | 121,181
Total | 305,873 | 182,307
Available-for-sale, Unrealized Loss |  |
Less than 12 Months | (3,772) | (689)
12 Months or More | (6,202) | (4,475)
Total | (9,974) | (5,164)
Held-to-maturity, Fair Value |  |
Less than 12 Months | 169,956 | 21,207
12 Months or More | 90,783 | 105,486
Total | 260,739 | 126,693
Held-to-maturity, Unrealized Loss |  |
Less than 12 Months | (4,092) | (186)
12 Months or More | (7,690) | (8,387)
Total | (11,782) | (8,573)
Corporate bonds |  |
Available-for-sale, Fair Value |  |
Less than 12 Months | 178,229 | 99,636
12 Months or More | 27,274 | 29,034
Total | 205,503 | 128,670
Available-for-sale, Unrealized Loss |  |
Less than 12 Months | (858) | (264)
12 Months or More | (386) | (219)
Total | (1,244) | (483)
Residential mortgage-backed securities |  |
Available-for-sale, Fair Value |  |
Less than 12 Months | 481,369 | 372,175
12 Months or More | 240,810 | 254,721
Total | 722,179 | 626,896
Available-for-sale, Unrealized Loss |  |
Less than 12 Months | (10,416) | (3,050)
12 Months or More | (9,512) | (4,880)
Total | (19,928) | (7,930)
Commercial mortgage-backed securities |  |
Available-for-sale, Fair Value |  |
Less than 12 Months | 72,464 | 37,650
12 Months or More | 58,173 | 62,968
Total | 130,637 | 100,618
Available-for-sale, Unrealized Loss |  |
Less than 12 Months | (904) | (469)
12 Months or More | (1,860) | (1,401)
Total | $ (2,764) | $ (1,870)

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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=82897076&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=82897076&loc=d3e27337-111563 + Details
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