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Securities - Gross Unrealized Losses and Fair Value by Investment Category (Details) $ in Thousands | Jun. 30, 2019 USD ($) security | Dec. 31, 2018 USD ($) security
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Available for Sale: |  |
Number of positions, Less than 12 Months | security | 5 | 168
Fair Value, Less than 12 Months | $ 9,877 | $ 509,808
Unrealized Losses, Less than 12 Months | $ (22) | $ (5,163)
Number of positions, 12 Months or More | security | 110 | 171
Fair value, 12 Months or More | $ 227,770 | $ 312,698
Unrealized Losses, 12 Months or More | $ (4,419) | $ (13,106)
Number of positions | security | 115 | 339
Fair value | $ 237,647 | $ 822,506
Unrealized Losses | $ (4,441) | $ (18,269)
Obligations of other U.S. Government agencies and corporations |  |
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 | $ 1,507 | $ 1,480
Unrealized Losses, 12 Months or More | $ (8) | $ (38)
Number of positions | security | 2 | 2
Fair value | $ 1,507 | $ 1,480
Unrealized Losses | $ (8) | $ (38)
Obligations of states and political subdivisions |  |
Available for Sale: |  |
Number of positions, Less than 12 Months | security | 2 | 34
Fair Value, Less than 12 Months | $ 2,263 | $ 22,159
Unrealized Losses, Less than 12 Months | $ (14) | $ (193)
Number of positions, 12 Months or More | security | 3 | 26
Fair value, 12 Months or More | $ 889 | $ 16,775
Unrealized Losses, 12 Months or More | $ (3) | $ (374)
Number of positions | security | 5 | 60
Fair value | $ 3,152 | $ 38,934
Unrealized Losses | $ (17) | $ (567)
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 | $ 10,386 | $ 10,633
Unrealized Losses, 12 Months or More | $ (1,859) | $ (1,726)
Number of positions | security | 2 | 2
Fair value | $ 10,386 | $ 10,633
Unrealized Losses | $ (1,859) | $ (1,726)
Other debt securities |  |
Available for Sale: |  |
Number of positions, Less than 12 Months | security | 1 | 12
Fair Value, Less than 12 Months | $ 760 | $ 19,011
Unrealized Losses, Less than 12 Months | $ (1) | $ (88)
Number of positions, 12 Months or More | security | 1 | 3
Fair value, 12 Months or More | $ 1,016 | $ 5,621
Unrealized Losses, 12 Months or More | $ (10) | $ (223)
Number of positions | security | 2 | 15
Fair value | $ 1,776 | $ 24,632
Unrealized Losses | $ (11) | $ (311)
Government agency mortgage backed securities | Residential mortgage backed securities |  |
Available for Sale: |  |
Number of positions, Less than 12 Months | security | 1 | 91
Fair Value, Less than 12 Months | $ 762 | $ 354,731
Unrealized Losses, Less than 12 Months | $ (1) | $ (3,945)
Number of positions, 12 Months or More | security | 65 | 73
Fair value, 12 Months or More | $ 123,783 | $ 125,757
Unrealized Losses, 12 Months or More | $ (1,497) | $ (5,181)
Number of positions | security | 66 | 164
Fair value | $ 124,545 | $ 480,488
Unrealized Losses | $ (1,498) | $ (9,126)
Government agency mortgage backed securities | Commercial mortgage-backed securities |  |
Available for Sale: |  |
Number of positions, Less than 12 Months | security | 0 | 5
Fair Value, Less than 12 Months | $ 0 | $ 6,506
Unrealized Losses, Less than 12 Months | $ 0 | $ (74)
Number of positions, 12 Months or More | security | 3 | 4
Fair value, 12 Months or More | $ 6,004 | $ 7,468
Unrealized Losses, 12 Months or More | $ (62) | $ (310)
Number of positions | security | 3 | 9
Fair value | $ 6,004 | $ 13,974
Unrealized Losses | $ (62) | $ (384)
Government agency collateralized mortgage obligations | Residential mortgage backed securities |  |
Available for Sale: |  |
Number of positions, Less than 12 Months | security | 1 | 24
Fair Value, Less than 12 Months | $ 6,092 | $ 97,451
Unrealized Losses, Less than 12 Months | $ (6) | $ (840)
Number of positions, 12 Months or More | security | 34 | 60
Fair value, 12 Months or More | $ 84,185 | $ 140,076
Unrealized Losses, 12 Months or More | $ (980) | $ (5,142)
Number of positions | security | 35 | 84
Fair value | $ 90,277 | $ 237,527
Unrealized Losses | $ (986) | $ (5,982)
Government agency collateralized mortgage obligations | Commercial mortgage-backed securities |  |
Available for Sale: |  |
Number of positions, Less than 12 Months | security | 0 | 2
Fair Value, Less than 12 Months | $ 0 | $ 9,950
Unrealized Losses, Less than 12 Months | $ 0 | $ (23)
Number of positions, 12 Months or More | security | 0 | 1
Fair value, 12 Months or More | $ 0 | $ 4,888
Unrealized Losses, 12 Months or More | $ 0 | $ (112)
Number of positions | security | 0 | 3
Fair value | $ 0 | $ 14,838
Unrealized Losses | $ 0 | $ (135)

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