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Securities Available-for-Sale (Tables) | 3 Months Ended
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Mar. 31, 2020
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 March 31, 2020 and December 31, 2019.
|  |  |  |  | Gross |  | Gross |  |  |
|  | Amortized |  | Unrealized |  | Unrealized |  | Fair
|  | Cost |  | Gains |  | Losses |  | Value
March 31, 2020 |  | (dollars in thousands)
Securities available-for-sale |  |  |  |  |  |  |  |  |  |  |  |  |
Federal agency obligations |  | $ | 36,392 |  | $ | 2,057 |  | $ | (1 | ) |  | $ | 38,448
Residential mortgage pass-through  securities |  |  | 232,864 |  |  | 5,759 |  |  | (3 | ) |  |  | 238,620
Commercial mortgage pass-through  securities |  |  | 2,032 |  |  | 160 |  |  | - |  |  |  | 2,192
Obligations of U.S. states and political subdivisions |  |  | 134,413 |  |  | 2,829 |  |  | (347 | ) |  |  | 136,895
Corporate bonds and notes |  |  | 25,151 |  |  | 207 |  |  | (620 | ) |  |  | 24,738
Asset-backed securities |  |  | 5,526 |  |  | - |  |  | (163 | ) |  |  | 5,363
Certificates of deposit |  |  | 149 |  |  | - |  |  | (2 | ) |  |  | 147
Other securities |  |  | 335 |  |  | - |  |  | - |  |  |  | 335
Total securities available-for-sale |  | $ | 436,862 |  | $ | 11,012 |  | $ | (1,136 | ) |  | $ | 446,738
|  |  |  |  | Gross |  | Gross |  |  |
|  | Amortized |  | Unrealized |  | Unrealized |  | Fair
|  | Cost |  | Gains |  | Losses |  | Value
December 31, 2019 |  | (dollars in thousands)
Securities available-for-sale |  |  |  |  |  |  |  |  |  |  |  |  |
Federal agency obligations |  | $ | 27,667 |  | $ | 612 |  | $ | (42 | ) |  | $ | 28,237
Residential mortgage pass-through  securities |  |  | 199,611 |  |  | 1,528 |  |  | (643 | ) |  |  | 200,496
Commercial mortgage pass-through  securities |  |  | 4,995 |  |  | 37 |  |  | (35 | ) |  |  | 4,997
Obligations of U.S. states and political subdivisions |  |  | 134,500 |  |  | 2,411 |  |  | (392 | ) |  |  | 136,519
Corporate bonds and notes |  |  | 28,142 |  |  | 285 |  |  | (45 | ) |  |  | 28,382
Asset-backed securities |  |  | 5,845 |  |  | - |  |  | (65 | ) |  |  | 5,780
Certificates of deposit |  |  | 148 |  |  | 2 |  |  | - |  |  |  | 150
Other securities |  |  | 140 |  |  | - |  |  | - |  |  |  | 140
Total securities available-for-sale |  | $ | 401,048 |  | $ | 4,875 |  | $ | (1,222 | ) |  | $ | 404,701
Investments Classified by Contractual Maturity Date [Table Text Block] | The following table presents information for investments in securities available-for-sale at March 31, 2020, 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.
|  | March 31, 2020
|  | Amortized |  | Fair
|  | Cost |  | Value
|  | (dollars in thousands)
Securities available-for-sale: |  |  |  |  |  |
Due in one year or less |  | $ | 5,104 |  | $ | 5,143
Due after one year through five years |  |  | 24,672 |  |  | 24,324
Due after five years through ten years |  |  | 25,077 |  |  | 25,731
Due after ten years |  |  | 146,778 |  |  | 150,393
Residential mortgage pass-through securities |  |  | 232,864 |  |  | 238,620
Commercial mortgage pass-through securities |  |  | 2,032 |  |  | 2,192
Other securities |  |  | 335 |  |  | 335
Total securities available-for-sale |  | $ | 436,862 |  | $ | 446,738
Schedule of Realized Gain (Loss) [Table Text Block] | Gross gains and losses from the sales of securities for periods presented were as follows (dollars in thousands):
|  | Three Months Ended |
|  | March 31, |
|  | 2020 |  | 2019 |
Proceeds |  | $ | 19,624 |  |  | $ | 94,075 |
Gross gains on sales of securities |  |  | 29 |  |  |  | 8 |
Gross losses on sales of securities |  |  | - |  |  |  | - |
Net gains on sales of securities |  |  | 29 |  |  |  | 8 |
Less: tax provision on net gains |  |  | (6 | ) |  |  | (2 | )
Net gains on sales of securities, after tax |  | $ | 23 |  |  | $ | 6 |
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 March 31, 2020 and December 31, 2019.
| March 31, 2020
| 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 | $ | 1,260 |  | $ | (1 | ) |  | $ | 1,249 |  | $ | (1 | ) |  | $ | 11 |  | $ | - |
Residential mortgage pass-through securities |  | 486 |  |  | (3 | ) |  |  | 35 |  |  | - |  |  |  | 451 |  |  | (3 | )
Commercial mortgage pass-through securities |  | - |  |  | - |  |  |  | - |  |  | - |  |  |  | - |  |  | - |
Obligations of U.S. states and political subdivisions |  | 27,436 |  |  | (347 | ) |  |  | 4,989 |  |  | (97 | ) |  |  | 22,447 |  |  | (250 | )
Corporate bonds and notes |  | 8,845 |  |  | (620 | ) |  |  | 8,845 |  |  | (620 | ) |  |  | - |  |  | - |
Asset-backed securities |  | 5,363 |  |  | (163 | ) |  |  | 2,115 |  |  | (82 | ) |  |  | 3,248 |  |  | (81 | )
Certificates of Deposit |  | 147 |  |  | (2 | ) |  |  | 147 |  |  | (2 | ) |  |  | - |  |  | - |
Total temporarily impaired securities | $ | 45,537 |  | $ | (1,136 | ) |  | $ | 17,380 |  | $ | (802 | ) |  | $ | 26,157 |  | $ | (334 | )
| December 31, 2019
| 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 | $ | 6,512 |  | $ | (42 | ) |  | $ | 6,498 |  | $ | (42 | ) |  | $ | 14 |  | $ | - |
Residential mortgage pass-through securities |  | 94,980 |  |  | (643 | ) |  |  | 49,154 |  |  | (179 | ) |  |  | 45,826 |  |  | (464 | )
Commercial mortgage pass-through securities |  | 2,006 |  |  | (35 | ) |  |  | 2,006 |  |  | (35 | ) |  |  | - |  |  | - |
Obligations of U.S. states and political subdivisions |  | 34,775 |  |  | (392 | ) |  |  | 10,306 |  |  | (8 | ) |  |  | 24,469 |  |  | (384 | )
Corporate bonds and notes |  | 5,437 |  |  | (45 | ) |  |  | 2,478 |  |  | (23 | ) |  |  | 2,959 |  |  | (22 | )
Asset-backed securities |  | 5,718 |  |  | (65 | ) |  |  | 2,268 |  |  | (22 | ) |  |  | 3,450 |  |  | (43 | )
Total Temporarily Impaired Securities | $ | 149,428 |  | $ | (1,222 | ) |  | $ | 72,710 |  | $ | (309 | ) |  | $ | 76,718 |  | $ | (913 | )

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