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Securities - Gross Unrealized Losses and Fair Value by Investment Category (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 USD ($) security | Sep. 30, 2017 USD ($) security
Held to Maturity: |  |
Number of positions, less than 12 months (securities) | security | 106 |
Number of positions, 12 months or more (securities) | security | 0 |
Number of positions (securities) | security | 106 |
Fair Value, Less than 12 Months | $ 95,277 |
Fair Value, 12 Months or More | 0 |
Fair Value | 95,277 |
Unrealized Losses, Less than 12 Months | (1,965) |
Unrealized Losses, 12 Months or More | 0 |
Unrealized Losses | $ (1,965) |
Available for Sale: |  |
Number of positions, less than 12 months (securities) | security | 184 | 160
Number of positions, 12 months or more (securities) | security | 26 | 40
Number of positions (securities) | security | 210 | 200
Fair Value, Less than 12 Months | $ 427,364 | $ 418,207
Fair Value, 12 Months or More | 67,255 | 94,362
Fair Value | 494,619 | 512,569
Unrealized Losses, Less than 12 Months | (8,564) | (3,138)
Unrealized Losses, 12 Months or More | (7,501) | (5,811)
Unrealized Losses | $ (16,065) | $ (8,949)
Trust preferred securities |  |
Available for Sale: |  |
Number of positions, less than 12 months (securities) | security | 0 | 0
Number of positions, 12 months or more (securities) | security | 3 | 2
Number of positions (securities) | security | 3 | 2
Fair Value, Less than 12 Months | $ 0 | $ 0
Fair Value, 12 Months or More | 18,389 | 8,960
Fair Value | 18,389 | 8,960
Unrealized Losses, Less than 12 Months | 0 | 0
Unrealized Losses, 12 Months or More | (5,360) | (3,494)
Unrealized Losses | $ (5,360) | $ (3,494)
Other debt securities |  |
Available for Sale: |  |
Number of positions, less than 12 months (securities) | security | 3 | 5
Number of positions, 12 months or more (securities) | security | 2 | 1
Number of positions (securities) | security | 5 | 6
Fair Value, Less than 12 Months | $ 7,946 | $ 9,105
Fair Value, 12 Months or More | 2,475 | 1,205
Fair Value | 10,421 | 10,310
Unrealized Losses, Less than 12 Months | (208) | (48)
Unrealized Losses, 12 Months or More | (10) | (8)
Unrealized Losses | $ (218) | $ (56)
Obligations of other U.S. Government agencies and corporations |  |
Held to Maturity: |  |
Number of positions, less than 12 months (securities) | security | 4 |
Number of positions, 12 months or more (securities) | security | 0 |
Number of positions (securities) | security | 4 |
Fair Value, Less than 12 Months | $ 11,915 |
Fair Value, 12 Months or More | 0 |
Fair Value | 11,915 |
Unrealized Losses, Less than 12 Months | (187) |
Unrealized Losses, 12 Months or More | 0 |
Unrealized Losses | $ (187) |
Available for Sale: |  |
Number of positions, less than 12 months (securities) | security | 0 | 4
Number of positions, 12 months or more (securities) | security | 0 | 0
Number of positions (securities) | security | 0 | 4
Fair Value, Less than 12 Months | $ 0 | $ 12,018
Fair Value, 12 Months or More | 0 | 0
Fair Value | 0 | 12,018
Unrealized Losses, Less than 12 Months | 0 | (84)
Unrealized Losses, 12 Months or More | 0 | 0
Unrealized Losses | $ 0 | $ (84)
Obligations of states and political subdivisions |  |
Held to Maturity: |  |
Number of positions, less than 12 months (securities) | security | 102 |
Number of positions, 12 months or more (securities) | security | 0 |
Number of positions (securities) | security | 102 |
Fair Value, Less than 12 Months | $ 83,362 |
Fair Value, 12 Months or More | 0 |
Fair Value | 83,362 |
Unrealized Losses, Less than 12 Months | (1,778) |
Unrealized Losses, 12 Months or More | 0 |
Unrealized Losses | $ (1,778) |
Available for Sale: |  |
Number of positions, less than 12 months (securities) | security |  | 16
Number of positions, 12 months or more (securities) | security |  | 3
Number of positions (securities) | security |  | 19
Fair Value, Less than 12 Months |  | $ 11,248
Fair Value, 12 Months or More |  | 2,037
Fair Value |  | 13,285
Unrealized Losses, Less than 12 Months |  | (105)
Unrealized Losses, 12 Months or More |  | (53)
Unrealized Losses |  | $ (158)
Government agency mortgage backed securities | Residential mortgage-backed securities |  |
Available for Sale: |  |
Number of positions, less than 12 months (securities) | security | 131 | 97
Number of positions, 12 months or more (securities) | security | 5 | 12
Number of positions (securities) | security | 136 | 109
Fair Value, Less than 12 Months | $ 298,400 | $ 249,318
Fair Value, 12 Months or More | 11,504 | 31,392
Fair Value | 309,904 | 280,710
Unrealized Losses, Less than 12 Months | (6,042) | (1,902)
Unrealized Losses, 12 Months or More | (601) | (752)
Unrealized Losses | $ (6,643) | $ (2,654)
Government agency mortgage backed securities | Commercial mortgage-backed securities |  |
Available for Sale: |  |
Number of positions, less than 12 months (securities) | security | 9 | 4
Number of positions, 12 months or more (securities) | security | 2 | 3
Number of positions (securities) | security | 11 | 7
Fair Value, Less than 12 Months | $ 21,933 | $ 9,906
Fair Value, 12 Months or More | 1,101 | 5,978
Fair Value | 23,034 | 15,884
Unrealized Losses, Less than 12 Months | (453) | (25)
Unrealized Losses, 12 Months or More | (8) | (148)
Unrealized Losses | $ (461) | $ (173)
Government agency collateralized mortgage obligations | Residential mortgage-backed securities |  |
Available for Sale: |  |
Number of positions, less than 12 months (securities) | security | 40 | 34
Number of positions, 12 months or more (securities) | security | 14 | 19
Number of positions (securities) | security | 54 | 53
Fair Value, Less than 12 Months | $ 97,356 | $ 126,612
Fair Value, 12 Months or More | 33,786 | 44,790
Fair Value | 131,142 | 171,402
Unrealized Losses, Less than 12 Months | (1,845) | (974)
Unrealized Losses, 12 Months or More | (1,522) | (1,356)
Unrealized Losses | $ (3,367) | $ (2,330)
Government agency collateralized mortgage obligations | Commercial mortgage-backed securities |  |
Available for Sale: |  |
Number of positions, less than 12 months (securities) | security | 1 | 0
Number of positions, 12 months or more (securities) | security | 0 | 0
Number of positions (securities) | security | 1 | 0
Fair Value, Less than 12 Months | $ 1,729 | $ 0
Fair Value, 12 Months or More | 0 | 0
Fair Value | 1,729 | 0
Unrealized Losses, Less than 12 Months | (16) | 0
Unrealized Losses, 12 Months or More | 0 | 0
Unrealized Losses | $ (16) | $ 0

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