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Securities (Tables) | 9 Months Ended
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Sep. 30, 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
September 30, 2017 |  |  |  |  |  |  |  |  |  |  |  |
Agency obligations (a) | $ | — | 29,496 | 24,009 | — | 53,505 |  | 230 | 654 |  | $ | 53,929
Agency RMBS (a) |  | — | — | 12,028 | 127,778 | 139,806 |  | 606 | 1,174 |  |  | 140,374
State and political subdivisions |  | — | 2,097 | 10,716 | 59,047 | 71,860 |  | 1,580 | 363 |  |  | 70,643
| Total available-for-sale | $ | — | 31,593 | 46,753 | 186,825 | 265,171 |  | 2,416 | 2,191 |  | $ | 264,946
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
September 30, 2017: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agency obligations | $ | 9,871 |  |  | 67 |  |  | 15,655 |  |  | 587 |  | $ | 25,526 |  |  | 654
Agency RMBS |  | 46,620 |  |  | 375 |  |  | 34,051 |  |  | 799 |  |  | 80,671 |  |  | 1,174
State and political subdivisions |  | 8,164 |  |  | 151 |  |  | 7,710 |  |  | 212 |  |  | 15,874 |  |  | 363
|  | Total | $ | 64,655 |  |  | 593 |  |  | 57,416 |  |  | 1,598 |  | $ | 122,071 |  |  | 2,191
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 of securities. |  |
|  |  |  |  | Quarter ended September 30, |  |  | Nine months ended September 30,
(Dollars in thousands) |  |  | 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016
Gross realized gains |  | $ | 49 |  |  | 148 |  | $ | 51 |  |  | 148
| Realized gains, net |  | $ | 49 |  |  | 148 |  | $ | 51 |  |  | 148

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