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Investment Securities (Tables) | 12 Months Ended
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Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract] |
Unrealized Gain (Loss) on Investments [Table Text Block] | The following tables present information related to the Company’s portfolio of securities available-for-sale at December 31, 2018 and 2017.
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
|  | (dollars in thousands) |
December 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment securities available-for-sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Federal agency obligations |  | $ | 45,509 |  |  | $ | 51 |  |  | $ | (605) |  |  | $ | 44,955 |
Residential mortgage pass-through securities |  |  | 189,721 |  |  |  | 85 |  |  |  | (4,602) |  |  |  | 185,204 |
Commercial mortgage pass-through securities |  |  | 3,919 |  |  |  | - |  |  |  | (45) |  |  |  | 3,874 |
Obligations of U.S. states and political subdivisions |  |  | 141,496 |  |  |  | 1,091 |  |  |  | (3,402) |  |  |  | 139,185 |
Trust preferred securities |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Corporate bonds and notes |  |  | 26,308 |  |  |  | 45 |  |  |  | (540) |  |  |  | 25,813 |
Asset-backed securities |  |  | 9,685 |  |  |  | 22 |  |  |  | (16) |  |  |  | 9,691 |
Certificates of deposit |  |  | 319 |  |  |  | 3 |  |  |  | - |  |  |  | 322 |
Other securities |  |  | 2,990 |  |  |  | - |  |  |  | - |  |  |  | 2,990 |
Total securities available-for-sale |  | $ | 419,947 |  |  | $ | 1,297 |  |  | $ | (9,210) |  |  | $ | 412,034 |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair 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 December 31, 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.
|  | December 31, 2018 |
|  | Amortized Cost |  |  | Fair Value |
|  | (dollars in thousands) |
Investment Securities Available-for-Sale: |  |  |  |  |  |  |  |
Due in one year or less |  | $ | 2,355 |  |  | $ | 2,358 |
Due after one year through five years |  |  | 36,338 |  |  |  | 35,953 |
Due after five years through ten years |  |  | 28,067 |  |  |  | 28,375 |
Due after ten years |  |  | 156,557 |  |  |  | 153,280 |
Residential mortgage pass-through securities |  |  | 189,721 |  |  |  | 185,204 |
Commercial mortgage pass-through securities |  |  | 3,919 |  |  |  | 3,874 |
Other securities |  |  | 2,990 |  |  |  | 2,990 |
Total securities available-for-sale |  | $ | 419,947 |  |  | $ | 412,034 |
Schedule of Realized Gain (Loss) [Table Text Block] | Gross gains and losses from the sales, calls, and maturities of investment securities for the years ended December 31, 2018, 2017 and 2016 were as follows:
|  | Years Ended December 31, |
|  | 2018 |  |  | 2017 |  |  | 2016 |
|  | (dollars in thousands) |
Proceeds |  | $ | - |  |  | $ | 29,543 |  |  | $ | 85,253 |
Gross gains on sales of investment securities |  | $ | - |  |  | $ | 1,596 |  |  | $ | 4,234 |
Gross losses on sales of investment securities |  |  | - |  |  |  | - |  |  |  | - |
Net gains on sales of investment securities |  |  | - |  |  |  | 1,596 |  |  |  | 4,234 |
Tax provision on net gains |  |  | - |  |  |  | (579) |  |  |  | (1,682) |
Net gains on sales of investment securities, after tax |  | $ | - |  |  | $ | 1,017 |  |  | $ | 2,552 |
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 December 31, 2018 and 2017. There were no investments held-to-maturity as of December 31, 2018 and 2017.
|  | December 31, 2018 |
|  | Total |  |  | Less than 12 Months |  |  | 12 Months or Longer |
|  | Fair Value |  |  | Unrealized Losses |  |  | Fair Value |  |  | Unrealized Losses |  |  | Fair Value |  |  | Unrealized Losses |
|  | (dollars in thousands)
Investment Securities Available-for-Sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Federal agency obligation |  | $ | 35,472 |  |  | $ | (605) |  |  | $ | 810 |  |  | $ | (1) |  |  | $ | 34,662 |  |  | $ | (604) |
Residential mortgage pass-through securities |  |  | 178,365 |  |  |  | (4,602) |  |  |  | 42,040 |  |  |  | (393) |  |  |  | 136,325 |  |  |  | (4,209) |
Commercial mortgage pass-through securities |  |  | 3,874 |  |  |  | (45) |  |  |  | - |  |  |  | - |  |  |  | 3,874 |  |  |  | (45) |
Obligations of U.S. states and political subdivisions |  |  | 64,367 |  |  |  | (3,402) |  |  |  | 7,765 |  |  |  | (21) |  |  |  | 56,602 |  |  |  | (3,381) |
Corporate bonds and notes |  |  | 15,534 |  |  |  | (540) |  |  |  | 7,767 |  |  |  | (133) |  |  |  | 7,767 |  |  |  | (407) |
Asset-backed securities |  |  | 3,957 |  |  |  | (16) |  |  |  | 2,219 |  |  |  | (11) |  |  |  | 1,738 |  |  |  | (5) |
Total Temporarily Impaired Securities |  | $ | 301,569 |  |  | $ | (9,210) |  |  | $ | 60,601 |  |  | $ | (559) |  |  | $ | 240,968 |  |  | $ | (8,651) |
|  | December 31, 2017 |
|  | Total |  |  | Less than 12 Months |  |  | 12 Months or Longer |
|  | Fair Value |  |  | Unrealized Losses |  |  | Fair Value |  |  | Unrealized Losses |  |  | Fair Value |  |  | Unrealized 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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