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Securities Available-for-Sale (Tables) | 6 Months Ended
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Jun. 30, 2018
Investments, Debt and Equity Securities [Abstract] |
Unrealized Gain (Loss) on Investments [Table Text Block] | The following table summarizes the amortized cost and fair value of securities available-for-sale at June 30, 2018 and December 31, 2017 and the corresponding amounts of gross unrealized gains and losses recognized in accumulated other comprehensive income (loss).
|  |  |  |  | Gross |  | Gross |  |  |
|  | Amortized |  | Unrealized |  | Unrealized |  | Fair
|  | Cost |  | Gains |  | Losses |  | Value
June 30, 2018 |  | (dollars in thousands)
Investment securities available-for-sale |  |  |  |  |  |  |  |  |  |  |  |  |
Federal agency obligations |  | $ | 52,588 |  | $ | 20 |  | $ | (1,124 | ) |  | $ | 51,484
Residential mortgage pass-through securities |  |  | 184,639 |  |  | 135 |  |  | (4,671 | ) |  |  | 180,103
Commercial mortgage pass-through securities |  |  | 3,987 |  |  | - |  |  | (94 | ) |  |  | 3,893
Obligations of U.S. states and political subdivisions |  |  | 125,885 |  |  | 1,003 |  |  | (3,259 | ) |  |  | 123,629
Corporate bonds and notes |  |  | 27,802 |  |  | 104 |  |  | (442 | ) |  |  | 27,464
Asset-backed securities |  |  | 10,889 |  |  | 61 |  |  | (4 | ) |  |  | 10,946
Certificates of deposit |  |  | 420 |  |  | 4 |  |  | - |  |  |  | 424
Other securities |  |  | 2,072 |  |  | - |  |  | - |  |  |  | 2,072
Total securities available-for-sale |  | $ | 408,282 |  | $ | 1,327 |  | $ | (9,594 | ) |  | $ | 400,015
|  |  |  |  | Gross |  | Gross |  |  |
|  | Amortized |  | Unrealized |  | Unrealized |  | Fair
|  | Cost |  | Gains |  | Losses |  | Value
December 31, 2017 |  | (dollars in thousands)
Investment securities available-for-sale |  |  |  |  |  |  |  |  |  |  |  |  |
Federal agency obligations |  | $ | 56,297 |  | $ | 141 |  | $ | (416 | ) |  | $ | 56,022
Residential mortgage pass-through securities |  |  | 183,509 |  |  | 330 |  |  | (1,948 | ) |  |  | 181,891
Commercial mortgage pass-through securities |  |  | 4,054 |  |  | 3 |  |  | (3 | ) |  |  | 4,054
Obligations of U.S. states and political subdivisions |  |  | 130,723 |  |  | 1,739 |  |  | (1,334 | ) |  |  | 131,128
Trust preferred securities |  |  | 4,577 |  |  | 205 |  |  | (111 | ) |  |  | 4,671
Corporate bonds and notes |  |  | 29,801 |  |  | 163 |  |  | (271 | ) |  |  | 29,693
Asset-backed securities |  |  | 12,021 |  |  | 66 |  |  | (37 | ) |  |  | 12,050
Certificates of deposit |  |  | 621 |  |  | 4 |  |  | - |  |  |  | 625
Equity securities |  |  | 11,843 |  |  | 235 |  |  | (350 | ) |  |  | 11,728
Other securities |  |  | 3,422 |  |  | - |  |  | - |  |  |  | 3,422
Total securities available-for-sale |  | $ | 436,868 |  | $ | 2,886 |  | $ | (4,470 | ) |  | $ | 435,284
Investments Classified by Contractual Maturity Date [Table Text Block] | The following table presents information for investments in securities available-for-sale at June 30, 2018, based on scheduled maturities. Actual maturities can be expected to differ from scheduled maturities due to prepayment or early call options of the issuer. Securities not due at a single maturity date are shown separately.
|  | June 30, 2018
|  | Amortized |  | Fair
|  | Cost |  | Value
|  | (dollars in thousands)
Investment Securities Available-for-Sale: |  |  |  |  |  |
Due in one year or less |  | $ | 6,817 |  | $ | 6,810
Due after one year through five years |  |  | 33,357 |  |  | 33,125
Due after five years through ten years |  |  | 31,599 |  |  | 31,918
Due after ten years |  |  | 145,811 |  |  | 142,094
Residential mortgage pass-through securities |  |  | 184,639 |  |  | 180,103
Commercial mortgage pass-through securities |  |  | 3,987 |  |  | 3,893
Other securities |  |  | 2,072 |  |  | 2,072
Total securities available-for-sale |  | $ | 408,282 |  | $ | 400,015
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,
|  | 2018 |  | 2017 |  | 2018 |  | 2017
|  | (dollars in thousands)
Proceeds |  | $ | - |  | $ | - |  | $ | - |  | $ | 29,543 |
Gross gains on sales of securities |  |  | - |  |  | - |  |  | - |  |  | 1,596 |
Gross losses on sales of securities |  |  | - |  |  | - |  |  | - |  |  | - |
Net gains on sales of securities |  |  | - |  |  | - |  |  | - |  |  | 1,596 |
Less: tax provision on net gains |  |  | - |  |  | - |  |  | - |  |  | (579 | )
Net gains on sales of securities, after tax |  | $ | - |  | $ | - |  | $ | - |  | $ | 1,017
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, 2018 and December 31, 2017:
|  | June 30, 2018
|  | Total |  | Less than 12 Months |  | 12 Months or Longer
|  | Fair |  | Unrealized |  | Fair |  | Unrealized |  | Fair |  | Unrealized
|  | Value |  | Losses |  | Value |  | Losses |  | Value |  | Losses
|  | (dollars in thousands)
Federal agency obligation |  | $ | 47,925 |  | $ | (1,125 | ) |  | $ | 37,267 |  | $ | (708 | ) |  | $ | 10,658 |  | $ | (417 | )
Residential mortgage pass-through securities |  |  | 172,308 |  |  | (4,672 | ) |  |  | 113,673 |  |  | (2,280 | ) |  |  | 58,635 |  |  | (2,392 | )
Commercial mortgage pass-through securities |  |  | 3,893 |  |  | (94 | ) |  |  | 3,893 |  |  | (94 | ) |  |  | - |  |  | - |
Obligations of U.S. states and political subdivisions |  |  | 65,916 |  |  | (3,258 | ) |  |  | 30,625 |  |  | (832 | ) |  |  | 35,291 |  |  | (2,426 | )
Corporate bonds and notes |  |  | 15,653 |  |  | (441 | ) |  |  | 11,012 |  |  | (122 | ) |  |  | 4,641 |  |  | (319 | )
Asset-backed securities |  |  | 2,821 |  |  | (4 | ) |  |  | 924 |  |  | - |  |  |  | 1,897 |  |  | (4 | )
Certificates of Deposit |  |  | 101 |  |  | - |  |  |  | 101 |  |  | - |  |  |  | - |  |  | - |
Total temporarily impaired securities |  | $ | 308,617 |  | $ | (9,594 | ) |  | $ | 197,495 |  | $ | (4,036 | ) |  | $ | 111,122 |  | $ | (5,558 | )
|  | December 31, 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)
Investment Securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-Sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Federal agency obligation |  | $ | 39,813 |  | $ | (416 | ) |  | $ | 28,407 |  | $ | (213 | ) |  | $ | 11,406 |  | $ | (203 | )
Residential mortgage pass-through securities |  |  | 148,574 |  |  | (1,948 | ) |  |  | 117,556 |  |  | (1,146 | ) |  |  | 31,018 |  |  | (802 | )
Commercial mortgage pass-through securities |  |  | 1,198 |  |  | (3 | ) |  |  | 1,198 |  |  | (3 | ) |  |  | - |  |  | - |
Obligations of U.S. states and political subdivisions |  |  | 57,685 |  |  | (1,334 | ) |  |  | 17,909 |  |  | (246 | ) |  |  | 39,776 |  |  | (1,088 | )
Trust preferred securities |  |  | 1,469 |  |  | (111 | ) |  |  | - |  |  | - |  |  |  | 1,469 |  |  | (111 | )
Corporate bonds and notes |  |  | 11,074 |  |  | (271 | ) |  |  | 1,965 |  |  | (21 | ) |  |  | 9,109 |  |  | (250 | )
Asset-backed securities |  |  | 7,428 |  |  | (37 | ) |  |  | 993 |  |  | (2 | ) |  |  | 6,435 |  |  | (35 | )
Equity securities |  |  | 11,116 |  |  | (350 | ) |  |  | - |  |  | - |  |  |  | 11,116 |  |  | (350 | )
Total Temporarily Impaired Securities |  | $ | 278,357 |  | $ | (4,470 | ) |  | $ | 168,028 |  | $ | (1,631 | ) |  | $ | 110,329 |  | $ | (2,839 | )

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