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Securities (Tables) | 9 Months Ended
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Sep. 30, 2016
Investments debt and equity securities [Abstract] |
Available-for-sale Securities [Table Text Block] |
|  |  | 1 year | 1 to 5 | 5 to 10 | After 10 | Fair |  | Gross Unrealized |  | Amortized
(Dollars in thousands) |  | or less | years | years | years | Value |  | Gains | Losses |  | Cost
September 30, 2016 |  |  |  |  |  |  |  |  |  |  |  |
Agency obligations (a) | $ | 3,080 | 17,889 | 20,856 | — | 41,825 |  | 634 | 40 |  | $ | 41,231
Agency RMBS (a) |  | — | 1,109 | 18,820 | 113,336 | 133,265 |  | 1,967 | 75 |  |  | 131,373
State and political subdivisions |  | — | 1,990 | 11,788 | 60,688 | 74,466 |  | 2,990 | 45 |  |  | 71,521
| Total available-for-sale | $ | 3,080 | 20,988 | 51,464 | 174,024 | 249,556 |  | 5,591 | 160 |  | $ | 244,125
December 31, 2015 |  |  |  |  |  |  |  |  |  |  |
Agency obligations (a) | $ | 5,000 | 25,852 | 19,463 | 9,770 | 60,085 |  | 384 | 518 |  | $ | 60,219
Agency RMBS (a) |  | — | 1,623 | 13,511 | 95,820 | 110,954 |  | 968 | 780 |  |  | 110,766
State and political subdivisions |  | — | 497 | 12,094 | 58,057 | 70,648 |  | 3,022 | 7 |  |  | 67,633
| Total available-for-sale | $ | 5,000 | 27,972 | 45,068 | 163,647 | 241,687 |  | 4,374 | 1,305 |  | $ | 238,618
(a) Includes securities issued by U.S. government agencies or government sponsored entities.
Available-for-sale Securities, Continuous Unrealized Loss Position [Table Text Block] |
|  |  |  | Less than 12 Months |  |  | 12 Months or Longer |  |  | Total
|  |  |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized
(Dollars in thousands) |  | Value |  |  | Losses |  |  | Value |  |  | Losses |  |  | Value |  |  | Losses
September 30, 2016: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agency obligations | $ | 10,747 |  |  | 40 |  |  | — |  |  | — |  | $ | 10,747 |  |  | 40
Agency RMBS |  | 31,374 |  |  | 75 |  |  | — |  |  | — |  |  | 31,374 |  |  | 75
State and political subdivisions |  | 6,155 |  |  | 45 |  |  | — |  |  | — |  |  | 6,155 |  |  | 45
|  | Total | $ | 48,276 |  |  | 160 |  |  | — |  |  | — |  | $ | 48,276 |  |  | 160
December 31, 2015: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agency obligations | $ | 8,157 |  |  | 2 |  |  | 24,444 |  |  | 516 |  | $ | 32,601 |  |  | 518
Agency RMBS |  | 42,345 |  |  | 367 |  |  | 18,184 |  |  | 413 |  |  | 60,529 |  |  | 780
State and political subdivisions |  | 267 |  |  | 1 |  |  | 969 |  |  | 6 |  |  | 1,236 |  |  | 7
|  | Total | $ | 50,769 |  |  | 370 |  |  | 43,597 |  |  | 935 |  | $ | 94,366 |  |  | 1,305
Schedule of Realized Gain (Loss) [Table Text Block] |
Realized Gains and Losses
The following table presents the gross realized gains and losses on sales of securities. |  |
|  |  |  |  | Quarter ended September 30, |  |  | Nine months ended September 30,
(Dollars in thousands) |  |  | 2016 |  |  | 2015 |  |  | 2016 |  |  | 2015
Gross realized gains |  | $ | 148 |  |  | 11 |  |  | 148 |  | $ | 14
| Realized gains, net |  | $ | 148 |  |  | 11 |  |  | 148 |  | $ | 14

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