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Securities Available-for-Sale (Tables) | 3 Months Ended
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Mar. 31, 2021
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 as of March 31, 2021 and December 31, 2020.
|  |  |  |  |  |  |  |  |  |  |  |  | Allowance
|  |  |  |  |  |  |  |  |  |  |  |  | for
|  |  |  |  | Gross |  | Gross |  |  |  |  |  | Investment
|  | Amortized |  | Unrealized |  | Unrealized |  | Fair |  |  | Credit
|  | Cost |  | Gains |  | Losses |  | Value |  |  | Losses
March 31, 2021 |  | (dollars in thousands) |  |  |
Securities available-for-sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Federal agency obligations |  | $ | 40,507 |  | $ | 1,141 |  | $ | (347 | ) |  | $ | 41,301 |  |  | -
Residential mortgage pass-through  securities |  |  | 238,406 |  |  | 3,628 |  |  | (1,680 | ) |  |  | 240,354 |  |  | -
Commercial mortgage pass-through  securities |  |  | 6,881 |  |  | 35 |  |  | (502 | ) |  |  | 6,414 |  |  | -
Obligations of U.S. states and political subdivisions |  |  | 127,809 |  |  | 2,925 |  |  | (231 | ) |  |  | 130,503 |  |  | -
Corporate bonds and notes |  |  | 17,444 |  |  | 221 |  |  | - |  |  |  | 17,665 |  |  | -
Asset-backed securities |  |  | 3,361 |  |  | 8 |  |  | (10 | ) |  |  | 3,359 |  |  | -
Certificates of deposit |  |  | 149 |  |  | 1 |  |  | - |  |  |  | 150 |  |  | -
Other securities |  |  | 2,277 |  |  | - |  |  | - |  |  |  | 2,277 |  |  | -
Total securities available-for-sale​​ |  | $ | 436,834 |  | $ | 7,959 |  | $ | (2,770 | ) |  | $ | 442,023 |  | $ | -
December 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities available-for-sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Federal agency obligations |  | $ | 37,015 |  | $ | 1,508 |  | $ | (65 | ) |  | $ | 38,458 |  |  | N/A
Residential mortgage pass-through  securities |  |  | 266,114 |  |  | 4,811 |  |  | (41 | ) |  |  | 270,884 |  |  | N/A
Commercial mortgage pass-through  securities |  |  | 6,906 |  |  | 203 |  |  | (187 | ) |  |  | 6,922 |  |  | N/A
Obligations of U.S. states and political subdivisions |  |  | 138,539 |  |  | 4,269 |  |  | - |  |  |  | 142,808 |  |  | N/A
Corporate bonds and notes |  |  | 24,925 |  |  | 222 |  |  | (52 | ) |  |  | 25,095 |  |  | N/A
Asset-backed securities |  |  | 3,521 |  |  | - |  |  | (41 | ) |  |  | 3,480 |  |  | N/A
Certificates of deposit |  |  | 149 |  |  | 2 |  |  | - |  |  |  | 151 |  |  | N/A
Other securities |  |  | 157 |  |  | - |  |  | - |  |  |  | 157 |  |  | N/A
Total securities available-for-sale​​ |  | $ | 477,326 |  | $ | 11,015 |  | $ | (386 | ) |  | $ | 487,955 |  |  | N/A
Investments Classified by Contractual Maturity Date [Table Text Block] | The following table presents information for investments in securities available-for-sale as of March 31, 2021, 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, 2021
|  | Amortized |  | Fair
|  | Cost |  | Value
|  | (dollars in thousands)
Securities available-for-sale: |  |  |  |  |  |
Due in one year or less |  | $ | 5,898 |  | $ | 5,929
Due after one year through five years |  |  | 16,369 |  |  | 16,625
Due after five years through ten years |  |  | 14,172 |  |  | 14,527
Due after ten years |  |  | 152,831 |  |  | 155,897
Residential mortgage pass-through securities |  |  | 238,406 |  |  | 240,354
Commercial mortgage pass-through securities |  |  | 6,881 |  |  | 6,414
Other securities |  |  | 2,277 |  |  | 2,277
Total securities available-for-sale |  | $ | 436,834 |  | $ | 442,023
Schedule of Realized Gain (Loss) [Table Text Block] | We had no gross gains or losses from the sale of securities for three months ended March 31, 2021. Gross gains and losses for three months ended March 31, 2020 from the sales of securities for periods presented were as follows (dollars in thousands):
|  | Three Months Ended |
|  | March 31, |
|  | 2021 |  | 2020 |
Proceeds |  | $ | - |  |  | $ | 19,624 |
Gross gains on sales of securities |  |  | - |  |  |  | 29 |
Gross losses on sales of securities |  |  | - |  |  |  | - |
Net gains on sales of securities |  |  | - |  |  |  | 29 |
Less: tax provision on net gains |  |  | - |  |  |  | (6 | )
Net gains on sales of securities, after tax |  | $ | - |  |  | $ | 23 |
Schedule of Unrealized Loss on Investments [Table Text Block] | Impairment Analysis of Available--for-sale Debt Securities The following tables indicate gross unrealized losses in an unrealized loss position for which an ACL has not been recorded, aggregated by investment category and by the length of continuous time individual securities have been in an unrealized loss position as of March 31, 2021 and December 31, 2020.
| March 31, 2021
| 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 | $ | 15,923 |  | $ | (347 | ) |  | $ | 15,922 |  | $ | (347 | ) |  | $ | 1 |  | $ | - |
Residential mortgage pass-through securities |  | 125,231 |  |  | (1,680 | ) |  |  | 125,223 |  |  | (1,680 | ) |  |  | 8 |  |  | - |
Commercial mortgage pass-through securities |  | 4,375 |  |  | (502 | ) |  |  | 4,375 |  |  | (502 | ) |  |  | - |  |  | - |
Obligations of U.S. states and political subdivisions |  | 29,179 |  |  | (231 | ) |  |  | 29,179 |  |  | (231 | ) |  |  | - |  |  | - |
Corporate bonds and notes |  | 1,000 |  |  | - |  |  |  | 1,000 |  |  | - |  |  |  | - |  |  | - |
Asset-backed securities |  | 900 |  |  | (10 | ) |  |  | - |  |  | - |  |  |  | 900 |  |  | (10 | )
Total temporarily impaired securities | $ | 176,608 |  | $ | (2,770 | ) |  | $ | 175,699 |  | $ | (2,760 | ) |  | $ | 909 |  | $ | (10 | )
| December 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 | $ | 8,978 |  | $ | (65 | ) |  | $ | 8,975 |  | $ | (65 | ) |  | $ | 3 |  | $ | - |
Residential mortgage pass-through securities |  | 20,895 |  |  | (41 | ) |  |  | 20,886 |  |  | (41 | ) |  |  | 9 |  |  | - |
Commercial mortgage pass-through securities |  | 3,954 |  |  | (187 | ) |  |  | 3,954 |  |  | (187 | ) |  |  | - |  |  | - |
Corporate bonds and notes |  | 3,928 |  |  | (52 | ) |  |  | 3,928 |  |  | (52 | ) |  |  | - |  |  | - |
Asset-backed securities |  | 3,083 |  |  | (41 | ) |  |  | 622 |  |  | - |  |  |  | 2,461 |  |  | (41 | )
Total Temporarily Impaired Securities | $ | 40,838 |  | $ | (386 | ) |  | $ | 38,365 |  | $ | (345 | ) |  | $ | 2,473 |  | $ | (41 | )

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