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Securities - Securities with Unrealized Losses (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Available-for-sale securities |  |
Fair value, less than 12 months | $ 7,154 | $ 111,648
Unrealized losses, less than 12 months | 40 | 886
Fair value, 12 months or longer | 1,077,153 | 1,109,535
Unrealized losses, 12 months or longer | 18,166 | 31,256
Fair Value | 1,084,307 | 1,221,183
Unrealized Losses | 18,206 | 32,142
Held-to-maturity debt securities |  |
Fair value, less than 12 months | 4,885 | 13,107
Unrealized losses, less than 12 months | 19 | 33
Fair value, 12 months or longer | 35,130 | 125,128
Unrealized losses, 12 months or longer | 149 | 1,189
Fair Value | 40,015 | 138,235
Unrealized Losses | 168 | 1,222
Obligations of U.S. Government sponsored entities |  |
Available-for-sale securities |  |
Fair value, less than 12 months | 0 | 21,660
Unrealized losses, less than 12 months | 0 | 183
Fair value, 12 months or longer | 420,382 | 449,141
Unrealized losses, 12 months or longer | 3,434 | 7,370
Fair Value | 420,382 | 470,801
Unrealized Losses | 3,434 | 7,553
Held-to-maturity debt securities |  |
Fair value, less than 12 months | 0 | 4,980
Unrealized losses, less than 12 months | 0 | 9
Fair value, 12 months or longer | 35,130 | 125,128
Unrealized losses, 12 months or longer | 149 | 1,189
Fair Value | 35,130 | 130,108
Unrealized Losses | 149 | 1,198
Obligations of U.S. states and political subdivisions |  |
Available-for-sale securities |  |
Fair value, less than 12 months | 1,582 | 11,971
Unrealized losses, less than 12 months | 7 | 19
Fair value, 12 months or longer | 31,020 | 49,756
Unrealized losses, 12 months or longer | 162 | 914
Fair Value | 32,602 | 61,727
Unrealized Losses | 169 | 933
U.S. Government agencies |  |
Available-for-sale securities |  |
Fair value, less than 12 months | 0 | 16,854
Unrealized losses, less than 12 months | 0 | 22
Fair value, 12 months or longer | 93,706 | 96,247
Unrealized losses, 12 months or longer | 2,645 | 3,710
Fair Value | 93,706 | 113,101
Unrealized Losses | 2,645 | 3,732
U.S. Government sponsored entities |  |
Available-for-sale securities |  |
Fair value, less than 12 months | 5,572 | 61,163
Unrealized losses, less than 12 months | 33 | 662
Fair value, 12 months or longer | 529,595 | 512,216
Unrealized losses, 12 months or longer | 11,875 | 18,937
Fair Value | 535,167 | 573,379
Unrealized Losses | 11,908 | 19,599
U.S. corporate debt securities |  |
Available-for-sale securities |  |
Fair value, less than 12 months | 0 | 0
Unrealized losses, less than 12 months | 0 | 0
Fair value, 12 months or longer | 2,450 | 2,175
Unrealized losses, 12 months or longer | 50 | 325
Fair Value | 2,450 | 2,175
Unrealized Losses | 50 | 325
Obligations of U.S. states and political subdivisions |  |
Held-to-maturity debt securities |  |
Fair value, less than 12 months | 4,885 | 8,127
Unrealized losses, less than 12 months | 19 | 24
Fair value, 12 months or longer | 0 | 0
Unrealized losses, 12 months or longer | 0 | 0
Fair Value | 4,885 | 8,127
Unrealized Losses | $ 19 | $ 24

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