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Securities Available-For-Sale (Tables) | 6 Months Ended
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Jun. 30, 2017
Investments, Debt and Equity Securities [Abstract] |
Unrealized Gain (Loss) on Investments [Table Text Block] | The following tables present information related to the Company’s securities at June 30, 2017 and December 31, 2016:
|  |  |  | Gross |  | Gross |  |  |
| Amortized |  | Unrealized |  | Unrealized |  | Fair
June 30, 2017 | Cost |  | Gains |  | Losses |  | Value
| (dollars in thousands)
Securities available-for-sale |  |  |  |  |  |  |  |  |  |  |  |
Federal agency obligations | $ | 59,509 |  | $ | 317 |  | $ | (181 | ) |  | $ | 59,645
Residential mortgage pass-through securities |  | 140,963 |  |  | 635 |  |  | (1,198 | ) |  |  | 140,400
Commercial mortgage pass-through securities |  | 4,120 |  |  | 53 |  |  | - |  |  |  | 4,173
Obligations of U.S. states and political subdivisions |  | 135,181 |  |  | 2,309 |  |  | (1,136 | ) |  |  | 136,354
Trust preferred securities |  | 4,576 |  |  | 83 |  |  | (73 | ) |  |  | 4,586
Corporate bonds and notes |  | 30,352 |  |  | 252 |  |  | (316 | ) |  |  | 30,288
Asset-backed securities |  | 13,293 |  |  | 48 |  |  | (60 | ) |  |  | 13,281
Certificates of deposit |  | 622 |  |  | 7 |  |  | - |  |  |  | 629
Equity securities |  | 377 |  |  | 227 |  |  | - |  |  |  | 604
Other securities |  | 12,454 |  |  | - |  |  | (284 | ) |  |  | 12,170
Total securities available-for-sale | $ | 401,447 |  | $ | 3,931 |  | $ | (3,248 | ) |  | $ | 402,130
|  |  |  | Gross |  | Gross |  |  |
| Amortized |  | Unrealized |  | Unrealized |  | Fair
December 31, 2016 | Cost |  | Gains |  | Losses |  | Value
| (dollars in thousands)
Securities available-for-sale |  |  |  |  |  |  |  |  |  |  |  |
Federal agency obligations | $ | 52,826 |  | $ | 282 |  | $ | (271 | ) |  | $ | 52,837
Residential mortgage pass-through securities |  | 72,922 |  |  | 519 |  |  | (944 | ) |  |  | 72,497
Commercial mortgage pass-through securities |  | 4,186 |  |  | 23 |  |  | - |  |  |  | 4,209
Obligations of U.S. states and political subdivisions |  | 148,747 |  |  | 2,789 |  |  | (931 | ) |  |  | 150,605
Trust preferred securities |  | 5,575 |  |  | 242 |  |  | (151 | ) |  |  | 5,666
Corporate bonds and notes |  | 36,717 |  |  | 586 |  |  | (375 | ) |  |  | 36,928
Asset-backed securities |  | 14,867 |  |  | 2 |  |  | (286 | ) |  |  | 14,583
Certificates of deposit |  | 973 |  |  | 10 |  |  | - |  |  |  | 983
Equity securities |  | 376 |  |  | 192 |  |  | - |  |  |  | 568
Other securities |  | 14,739 |  |  | - |  |  | (325 | ) |  |  | 14,414
Total securities available-for-sale | $ | 351,928 |  | $ | 4,645 |  | $ | (3,283 | ) |  | $ | 353,290
Investments Classified by Contractual Maturity Date [Table Text Block] | The following table presents information for securities at June 30, 2017, based on scheduled maturities. Actual maturities can be expected to differ from scheduled maturities due to prepayment or early call options of the issuer.
| June 30, 2017
| Amortized |  | Fair
| Cost |  | Value
| (dollars in thousands)
Securities available-for-sale: |  |  |  |  |
Due in one year or less | $ | 5,577 |  | $ | 5,602
Due after one year through five years |  | 29,846 |  |  | 30,058
Due after five years through ten years |  | 39,632 |  |  | 40,261
Due after ten years |  | 168,478 |  |  | 168,862
Residential mortgage pass-through securities |  | 140,963 |  |  | 140,400
Commercial mortgage pass-through securities |  | 4,120 |  |  | 4,173
Equity securities |  | 377 |  |  | 604
Other securities |  | 12,454 |  |  | 12,170
Total | $ | 401,447 |  | $ | 402,130
Schedule of Realized Gain (Loss) [Table Text Block] | Gross gains and losses from the sales, calls and maturities of securities for periods presented were as follows:
|  | Three Months Ended |  | Six Months Ended
|  | June 30, |  | June 30,
|  | 2017 |  | 2016 |  | 2017 |  | 2016
|  | (dollars in thousands)
Proceeds |  | $ | - |  | $ | 6,573 |  | $ | 29,543 |  |  | $ | 6,573
Gross gains on sales of securities |  |  | - |  |  | 103 |  |  | 1,596 |  |  |  | 103
Gross losses on sales of securities |  |  | - |  |  | - |  |  | - |  |  |  | -
Net gains on sales of securities |  |  | - |  |  | 103 |  |  | 1,596 |  |  |  | 103
Less: tax provision on net gains |  |  | - |  |  | 42 |  |  | (579 | ) |  |  | 42
Net gains on sales of securities, after tax |  | $ | - |  | $ | 61 |  | $ | 1,017 |  |  | $ | 61
Schedule of Unrealized Loss on Investments [Table Text Block] | The following tables indicate gross unrealized losses not recognized in income and fair value, aggregated by investment category and the length of time individual securities have been in a continuous unrealized loss position at June 30, 2017 and December 31, 2016:
|  | June 30, 2017
|  | Total |  | Less than 12 Months |  | 12 Months or Longer
|  | Fair |  | Unrealized |  | Fair |  | Unrealized |  | Fair |  | Unrealized
|  | Value |  | Losses |  | Value |  | Losses |  | Value |  | Losses
|  | (dollars in thousands)
Securities available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Federal agency obligation |  | $ | 22,344 |  | $ | (181 | ) |  | $ | 21,184 |  | $ | (177 | ) |  | $ | 1,160 |  | $ | (4 | )
Residential mortgage pass-through securities |  |  | 88,378 |  |  | (1,198 | ) |  |  | 86,925 |  |  | (1,161 | ) |  |  | 1,453 |  |  | (37 | )
Obligations of U.S. states and political subdivisions |  |  | 58,315 |  |  | (1,136 | ) |  |  | 58,315 |  |  | (1,136 | ) |  |  | - |  |  | - |
Trust preferred securities |  |  | 1,505 |  |  | (73 | ) |  |  | - |  |  | - |  |  |  | 1,505 |  |  | (73 | )
Corporate bonds and notes |  |  | 16,292 |  |  | (316 | ) |  |  | 7,086 |  |  | (164 | ) |  |  | 9,206 |  |  | (152 | )
Asset-backed securities |  |  | 8,249 |  |  | (60 | ) |  |  | - |  |  | - |  |  |  | 8,249 |  |  | (60 | )
Other securities |  |  | 11,182 |  |  | (284 | ) |  |  | 5,905 |  |  | (61 | ) |  |  | 5,277 |  |  | (223 | )
Total temporarily impaired securities |  | $ | 206,265 |  | $ | (3,248 | ) |  | $ | 179,415 |  | $ | (2,699 | ) |  | $ | 26,850 |  | $ | (549 | )
|  | December 31, 2016
|  | Total |  | Less than 12 Months |  | 12 Months or Longer
|  | Fair |  | Unrealized |  | Fair |  | Unrealized |  | Fair |  | Unrealized
|  | Value |  | Losses |  | Value |  | Losses |  | Value |  | Losses
|  | (dollars in thousands)
Securities available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Federal agency obligation |  | $ | 22,672 |  | $ | (271 | ) |  | $ | 21,416 |  | $ | (262 | ) |  | $ | 1,256 |  | $ | (9 | )
Residential mortgage pass-through securities |  |  | 50,136 |  |  | (944 | ) |  |  | 49,817 |  |  | (937 | ) |  |  | 319 |  |  | (7 | )
Obligations of U.S. states and political subdivisions |  |  | 52,307 |  |  | (931 | ) |  |  | 52,307 |  |  | (931 | ) |  |  | - |  |  | - |
Trust preferred securities |  |  | 1,427 |  |  | (151 | ) |  |  | - |  |  | - |  |  |  | 1,427 |  |  | (151 | )
Corporate bonds and notes |  |  | 15,930 |  |  | (375 | ) |  |  | 7,671 |  |  | (265 | ) |  |  | 8,259 |  |  | (110 | )
Asset-backed securities |  |  | 13,404 |  |  | (286 | ) |  |  | 3,743 |  |  | (88 | ) |  |  | 9,661 |  |  | (198 | )
Other securities |  |  | 11,467 |  |  | (325 | ) |  |  | - |  |  | - |  |  |  | 11,467 |  |  | (325 | )
Total temporarily impaired securities |  | $ | 167,343 |  | $ | (3,283 | ) |  | $ | 134,954 |  | $ | (2,483 | ) |  | $ | 32,389 |  | $ | (800 | )

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