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Debt Securities with an Unrealized Loss Position (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Available-for-sale, Fair Value |  |
Less than 12 Months | $ 444,401 | $ 586,721
12 Months or More | 1,016,813 | 484,508
Total | 1,461,214 | 1,071,229
Available-for-sale, Unrealized Loss |  |
Less than 12 Months | (3,224) | (4,533)
12 Months or Longer | (28,993) | (11,161)
Total | (32,217) | (15,694)
Held-to-maturity, Fair Value |  |
Less than 12 Months | 87,392 | 21,207
12 Months or More | 126,226 | 105,486
Total | 213,618 | 126,693
Held-to-maturity, Unrealized Loss |  |
Less than 12 Months | (2,778) | (186)
12 Months or More | (8,261) | (8,387)
Total | (11,039) | (8,573)
U.S. government and federal agency |  |
Available-for-sale, Fair Value |  |
Less than 12 Months | 4,287 | 1,208
12 Months or More | 10,519 | 13,179
Total | 14,806 | 14,387
Available-for-sale, Unrealized Loss |  |
Less than 12 Months | (27) | (5)
12 Months or Longer | (135) | (138)
Total | (162) | (143)
U.S. government sponsored enterprises |  |
Available-for-sale, Fair Value |  |
Less than 12 Months | 43,400 | 14,926
12 Months or More | 35,544 | 3,425
Total | 78,944 | 18,351
Available-for-sale, Unrealized Loss |  |
Less than 12 Months | (103) | (56)
12 Months or Longer | (411) | (48)
Total | (514) | (104)
State and local governments |  |
Available-for-sale, Fair Value |  |
Less than 12 Months | 72,080 | 61,126
12 Months or More | 232,244 | 121,181
Total | 304,324 | 182,307
Available-for-sale, Unrealized Loss |  |
Less than 12 Months | (922) | (689)
12 Months or Longer | (10,400) | (4,475)
Total | (11,322) | (5,164)
Held-to-maturity, Fair Value |  |
Less than 12 Months | 87,392 | 21,207
12 Months or More | 126,226 | 105,486
Total | 213,618 | 126,693
Held-to-maturity, Unrealized Loss |  |
Less than 12 Months | (2,778) | (186)
12 Months or More | (8,261) | (8,387)
Total | (11,039) | (8,573)
Corporate bonds |  |
Available-for-sale, Fair Value |  |
Less than 12 Months | 119,111 | 99,636
12 Months or More | 114,800 | 29,034
Total | 233,911 | 128,670
Available-for-sale, Unrealized Loss |  |
Less than 12 Months | (937) | (264)
12 Months or Longer | (676) | (219)
Total | (1,613) | (483)
Residential mortgage backed securities |  |
Available-for-sale, Fair Value |  |
Less than 12 Months | 132,405 | 372,175
12 Months or More | 537,202 | 254,721
Total | 669,607 | 626,896
Available-for-sale, Unrealized Loss |  |
Less than 12 Months | (833) | (3,050)
12 Months or Longer | (15,417) | (4,880)
Total | (16,250) | (7,930)
Commercial mortgage backed securities |  |
Available-for-sale, Fair Value |  |
Less than 12 Months | 73,118 | 37,650
12 Months or More | 86,504 | 62,968
Total | 159,622 | 100,618
Available-for-sale, Unrealized Loss |  |
Less than 12 Months | (402) | (469)
12 Months or Longer | (1,954) | (1,401)
Total | $ (2,356) | $ (1,870)

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