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Securities (Tables) | 12 Months Ended
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Dec. 31, 2017
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
December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |
Agency obligations (a) | $ | — | 29,253 | 23,809 | — | 53,062 |  | 79 | 904 |  | $ | 53,887
Agency RMBS (a) |  | — | — | 11,201 | 121,871 | 133,072 |  | 330 | 1,639 |  |  | 134,381
State and political subdivisions |  | — | 2,564 | 9,999 | 59,000 | 71,563 |  | 1,616 | 237 |  |  | 70,184
| Total available-for-sale | $ | — | 31,817 | 45,009 | 180,871 | 257,697 |  | 2,025 | 2,780 |  | $ | 258,452
December 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |
Agency obligations (a) | $ | 3,047 | 22,531 | 19,893 | — | 45,471 |  | 331 | 973 |  | $ | 46,113
Agency RMBS (a) |  | — | 972 | 16,171 | 110,644 | 127,787 |  | 551 | 1,805 |  | $ | 129,041
State and political subdivisions |  | — | 2,480 | 10,210 | 57,624 | 70,314 |  | 1,509 | 734 |  | $ | 69,539
| Total available-for-sale | $ | 3,047 | 25,983 | 46,274 | 168,268 | 243,572 |  | 2,391 | 3,512 |  | $ | 244,693
(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
December 31, 2017: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agency obligations | $ | 14,381 |  |  | 99 |  |  | 20,353 |  |  | 805 |  |  | 34,734 |  | $ | 904
Agency RMBS |  | 53,440 |  |  | 363 |  |  | 50,729 |  |  | 1,276 |  |  | 104,169 |  |  | 1,639
State and political subdivisions |  | 2,009 |  |  | 22 |  |  | 10,155 |  |  | 215 |  |  | 12,164 |  |  | 237
|  | Total | $ | 69,830 |  |  | 484 |  |  | 81,237 |  |  | 2,296 |  |  | 151,067 |  | $ | 2,780
December 31, 2016: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agency obligations | $ | 20,352 |  |  | 973 |  |  | — |  |  | — |  |  | 20,352 |  | $ | 973
Agency RMBS |  | 89,062 |  |  | 1,805 |  |  | — |  |  | — |  |  | 89,062 |  |  | 1,805
State and political subdivisions |  | 20,444 |  |  | 734 |  |  | — |  |  | — |  |  | 20,444 |  |  | 734
|  | Total | $ | 129,858 |  |  | 3,512 |  |  | — |  |  | — |  |  | 129,858 |  | $ | 3,512
Schedule of Realized Gain (Loss) [Table Text Block] |
Realized Gains and Losses
The following table presents the gross realized gains and losses on sales related to securities.
|  |  |  | Year ended December 31
(Dollars in thousands) |  |  | 2017 |  |  | 2016
Gross realized gains |  | $ | 51 |  |  | 166
Gross realized losses |  |  | — |  |  | (387)
| Realized gains (losses), net |  | $ | 51 |  |  | (221)

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