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Investment Securities (Tables) | 9 Months Ended
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Sep. 30, 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 September 30, 2021 and December 31, 2020.
|  |  |  |  |  |  |  |  |  |  |  |  | Allowance
|  |  |  |  |  |  |  |  |  |  |  |  | for
|  |  |  |  | Gross |  | Gross |  |  |  |  |  | Investment
|  | Amortized |  | Unrealized |  | Unrealized |  | Fair |  |  | Credit
|  | Cost |  | Gains |  | Losses |  | Value |  |  | Losses
September 30, 2021 |  | (dollars in thousands) |  |  |
Securities available-for-sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Federal agency obligations |  | $ | 50,016 |  | $ | 1,032 |  | $ | - |  |  | $ | 51,048 |  | $ | -
Residential mortgage pass-through securities |  |  | 255,488 |  |  | 2,640 |  |  | (2,073 | ) |  |  | 256,055 |  |  | -
Commercial mortgage pass-through securities |  |  | 10,859 |  |  | 135 |  |  | (468 | ) |  |  | 10,526 |  |  | -
Obligations of U.S. states and political subdivisions |  |  | 129,632 |  |  | 1,693 |  |  | (1,051 | ) |  |  | 130,274 |  |  | -
Corporate bonds and notes |  |  | 10,965 |  |  | 124 |  |  | - |  |  |  | 11,089 |  |  | -
Asset-backed securities |  |  | 2,718 |  |  | 6 |  |  | (2 | ) |  |  | 2,722 |  |  | -
Certificates of deposit |  |  | 149 |  |  | 1 |  |  | - |  |  |  | 150 |  |  | -
Other securities |  |  | 1,020 |  |  | - |  |  | - |  |  |  | 1,020 |  |  | -
Total securities available-for-sale​​ |  | $ | 460,847 |  | $ | 5,631 |  | $ | (3,594 | ) |  | $ | 462,884 |  | $ | -
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 September 30, 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.
|  | September 30, 2021
|  | Amortized |  | Fair
|  | Cost |  | Value
|  | (dollars in thousands)
Securities available-for-sale: |  |  |  |  |  |
Due in one year or less |  | $ | 4,439 |  | $ | 4,451
Due after one year through five years |  |  | 9,911 |  |  | 10,024
Due after five years through ten years |  |  | 7,777 |  |  | 8,029
Due after ten years |  |  | 171,353 |  |  | 172,779
Residential mortgage pass-through securities |  |  | 255,488 |  |  | 256,055
Commercial mortgage pass-through securities |  |  | 10,859 |  |  | 10,526
Other securities |  |  | 1,020 |  |  | 1,020
Total securities available-for-sale |  | $ | 460,847 |  | $ | 462,884
Schedule of Realized Gain (Loss) [Table Text Block] | Gross gains and losses from the sales and redemptions of securities for periods presented were as follows:
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  |  | (dollars in thousands) |
|  | 2021 |  | 2020 |  |  | 2021 |  | 2020 |
Proceeds |  | $ | - |  |  | $ | - |  |  | $ | 5,185 |  |  | $ | 19,624 |
Gross gains on sales/redemption of securities |  |  | - |  |  |  | - |  |  |  | 195 |  |  |  | 29 |
Gross losses on sales/redemptions of securities |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Net gains on sales/redemptions of securities |  |  | - |  |  |  | - |  |  |  | 195 |  |  |  | 29 |
Less: tax provision on net gains |  |  | - |  |  |  | - |  |  |  | (48 | ) |  |  | (6 | )
Net gains on sales/redemptions of securities, after tax |  | $ | - |  |  | $ | - |  |  | $ | 147 |  |  | $ | 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 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 September 30, 2021 and December 31, 2020.
| September 30, 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: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential mortgage pass-through securities | $ | 171,592 |  | $ | (2,073 | ) |  | $ | 171,592 |  | $ | (2,073 | ) |  | $ | - |  | $ | - |
Commercial mortgage pass-through securities |  | 6,349 |  |  | (468 | ) |  |  | 2,658 |  |  | (67 | ) |  |  | 3,691 |  |  | (401 | )
Obligations of U.S. states and political subdivisions |  | 71,938 |  |  | (1,051 | ) |  |  | 71,938 |  |  | (1,051 | ) |  |  | - |  |  | - |
Asset-backed securities |  | 1,389 |  |  | (2 | ) |  |  | 840 |  |  | - |  |  |  | 549 |  |  | (2 | )
Total temporarily impaired securities | $ | 251,268 |  | $ | (3,594 | ) |  | $ | 247,028 |  | $ | (3,191 | ) |  | $ | 4,240 |  | $ | (403 | )
| 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 obligations | $ | 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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