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Securities - Gross Unrealized Losses and Fair Value by Investment Category (Details) $ in Thousands | Jun. 30, 2018 USD ($) security | Dec. 31, 2017 USD ($) security
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Available for Sale: |  |
Number of positions, Less than 12 Months | security | 231 | 91
Fair Value, Less than 12 Months | $ 622,240 | $ 190,832
Unrealized Losses, Less than 12 Months | $ (10,107) | $ (2,234)
Number of positions, 12 Months or More | security | 103 | 94
Fair value, 12 Months or More | $ 194,840 | $ 183,115
Unrealized Losses, 12 Months or More | $ (11,688) | $ (8,254)
Number of positions | security | 334 | 185
Fair value | $ 817,080 | $ 373,947
Unrealized Losses | $ (21,795) | $ (10,488)
Trust preferred securities |  |
Available for Sale: |  |
Number of positions, Less than 12 Months | security | 0 | 0
Fair Value, Less than 12 Months | $ 0 | $ 0
Unrealized Losses, Less than 12 Months | $ 0 | $ 0
Number of positions, 12 Months or More | security | 2 | 2
Fair value, 12 Months or More | $ 10,401 | $ 9,388
Unrealized Losses, 12 Months or More | $ (2,001) | $ (3,054)
Number of positions | security | 2 | 2
Fair value | $ 10,401 | $ 9,388
Unrealized Losses | $ (2,001) | $ (3,054)
Other debt securities |  |
Available for Sale: |  |
Number of positions, Less than 12 Months | security | 10 | 2
Fair Value, Less than 12 Months | $ 10,011 | $ 756
Unrealized Losses, Less than 12 Months | $ (110) | $ (12)
Number of positions, 12 Months or More | security | 2 | 2
Fair value, 12 Months or More | $ 5,815 | $ 6,308
Unrealized Losses, 12 Months or More | $ (192) | $ (64)
Number of positions | security | 12 | 4
Fair value | $ 15,826 | $ 7,064
Unrealized Losses | $ (302) | $ (76)
Obligations of other U.S. Government agencies and corporations |  |
Available for Sale: |  |
Number of positions, Less than 12 Months | security | 1 | 1
Fair Value, Less than 12 Months | $ 492 | $ 497
Unrealized Losses, Less than 12 Months | $ (8) | $ (3)
Number of positions, 12 Months or More | security | 2 | 2
Fair value, 12 Months or More | $ 1,980 | $ 1,999
Unrealized Losses, 12 Months or More | $ (41) | $ (27)
Number of positions | security | 3 | 3
Fair value | $ 2,472 | $ 2,496
Unrealized Losses | $ (49) | $ (30)
Obligations of states and political subdivisions |  |
Available for Sale: |  |
Number of positions, Less than 12 Months | security | 51 | 23
Fair Value, Less than 12 Months | $ 32,251 | $ 11,860
Unrealized Losses, Less than 12 Months | $ (386) | $ (59)
Number of positions, 12 Months or More | security | 13 | 12
Fair value, 12 Months or More | $ 7,800 | $ 7,728
Unrealized Losses, 12 Months or More | $ (372) | $ (210)
Number of positions | security | 64 | 35
Fair value | $ 40,051 | $ 19,588
Unrealized Losses | $ (758) | $ (269)
Government agency mortgage backed securities | Residential mortgage backed securities: |  |
Available for Sale: |  |
Number of positions, Less than 12 Months | security | 105 | 29
Fair Value, Less than 12 Months | $ 361,859 | $ 64,595
Unrealized Losses, Less than 12 Months | $ (5,623) | $ (659)
Number of positions, 12 Months or More | security | 47 | 44
Fair value, 12 Months or More | $ 88,914 | $ 89,414
Unrealized Losses, 12 Months or More | $ (4,589) | $ (2,400)
Number of positions | security | 152 | 73
Fair value | $ 450,773 | $ 154,009
Unrealized Losses | $ (10,212) | $ (3,059)
Government agency mortgage backed securities | Commercial mortgage-backed securities |  |
Available for Sale: |  |
Number of positions, Less than 12 Months | security | 8 | 2
Fair Value, Less than 12 Months | $ 14,530 | $ 5,629
Unrealized Losses, Less than 12 Months | $ (178) | $ (17)
Number of positions, 12 Months or More | security | 3 | 3
Fair value, 12 Months or More | $ 5,659 | $ 5,872
Unrealized Losses, 12 Months or More | $ (352) | $ (217)
Number of positions | security | 11 | 5
Fair value | $ 20,189 | $ 11,501
Unrealized Losses | $ (530) | $ (234)
Government agency collateralized mortgage obligations | Residential mortgage backed securities: |  |
Available for Sale: |  |
Number of positions, Less than 12 Months | security | 52 | 33
Fair Value, Less than 12 Months | $ 178,776 | $ 102,509
Unrealized Losses, Less than 12 Months | $ (3,538) | $ (1,470)
Number of positions, 12 Months or More | security | 34 | 29
Fair value, 12 Months or More | $ 74,271 | $ 62,406
Unrealized Losses, 12 Months or More | $ (4,141) | $ (2,282)
Number of positions | security | 86 | 62
Fair value | $ 253,047 | $ 164,915
Unrealized Losses | $ (7,679) | $ (3,752)
Government agency collateralized mortgage obligations | Commercial mortgage-backed securities |  |
Available for Sale: |  |
Number of positions, Less than 12 Months | security | 4 | 1
Fair Value, Less than 12 Months | $ 24,321 | $ 4,986
Unrealized Losses, Less than 12 Months | $ (264) | $ (14)
Number of positions, 12 Months or More | security | 0 | 0
Fair value, 12 Months or More | $ 0 | $ 0
Unrealized Losses, 12 Months or More | $ 0 | $ 0
Number of positions | security | 4 | 1
Fair value | $ 24,321 | $ 4,986
Unrealized Losses | $ (264) | $ (14)

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