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Employee Benefit Plans (Tables) | 9 Months Ended
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Sep. 30, 2021
Defined Benefit Plan [Abstract] |
Schedule of Option Activity | ​
​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Weighted
​ | ​ | ​ | ​ | Average
​ | ​ | ​ | ​ | Exercisable
​ | ​ | Number | ​ | Price
Outstanding at December 31, 2020 |  | 99,617 | ​ | $ | 10.19
Granted |  | — | ​ |  | —
Exercised |  | (19,040) | ​ |  | 10.18
Forfeited |  | — | ​ |  | —
Outstanding at September 30, 2021 |  | 80,577 | ​ | $ | 10.19
Schedule of Options Outstanding by Exercise Price Range | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | Options Outstanding | ​ | Options Exercisable
​ | ​ |  | ​ |  | Weighted- |  | ​ | ​ |  | ​ |  | ​ | ​
​ | ​ | ​ | ​ | ​ | Average | ​ | Weighted- | ​ | ​ | ​ | Weighted-
​ | ​ | ​ | ​ | ​ | Remaining | ​ | Average | ​ | ​ | ​ | Average
Exercise | ​ | Number | ​ | Contractual | ​ | Exercise | ​ | Number | ​ | Exercise
Prices | ​ | Outstanding | ​ | Life | ​ | Price | ​ | Exercisable | ​ | Price
$ | 6.60 |  | 19,250 |  | 0.45 years | ​ | $ | 6.60 |  | 19,250 | ​ | $ | 6.60
​ | 9.48 |  | 18,000 |  | 1.45 years | ​ |  | 9.48 |  | 18,000 | ​ |  | 9.48
​ | 9.60 |  | 22,250 |  | 2.25 years | ​ |  | 9.60 |  | 22,250 | ​ |  | 9.60
​ | 11.76 |  | 2,266 |  | 0.75 years | ​ |  | 11.76 |  | 2,266 | ​ |  | 11.76
​ | 15.05 |  | 18,811 |  | 3.75 years | ​ |  | 15.05 |  | 18,811 | ​ |  | 15.05
Outstanding, end of period |  | 80,577 |  | 1.95 years | ​ | $ | 10.19 | ​ | 80,577 | ​ | $ | 10.19
Schedule of Non-vested Restricted Stock Awards | ​
​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Weighted
​ | ​ | ​ | ​ | Average
​ | ​ | ​ | ​ | Grant-Date
​ | ​ | Number | ​ | Fair Value
Balance at December 31, 2020 |  | 100,218 | ​ | $ | 19.07
Granted |  | 53,134 | ​ |  | 20.43
Vested |  | (7,185) | ​ |  | 21.42
Forfeited/expired |  | (1,800) | ​ |  | 16.37
Balance at September 30, 2021 |  | 144,367 | ​ | $ | 19.49
Share-based Payment Arrangement, Stock Appreciation Right, Activity | A summary of the status of SARs plans is presented in the following table: ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted
​ | ​ | ​ | ​ | Average
​ |  | Number |  | Exercisable Price
Outstanding at December 31, 2020 | ​ | 73,000 | ​ | $ | 19.02
Granted | ​ | 22,000 | ​ | ​ | 20.70
Exercised |  | (23,500) |  | ​ | 21.61
Forfeited |  | (6,000) |  | ​ | 18.00
Outstanding at September 30, 2021 |  | 65,500 | ​ | $ | 18.75
​ Information pertaining to SARs outstanding at September 30, 2021, is as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | SARs Outstanding | ​ | SARs Exercisable
​ | ​ | ​ | ​ | ​ | Weighted- | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Average | ​ | Weighted- | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Remaining | ​ | Average | ​ | ​ | ​ | Weighted- Average
Exercise | ​ | Number | ​ | Contractual | ​ | Exercise | ​ | Number | ​ | Exercise
Prices |  | Outstanding |  | Life | ​ | ​ | Price | ​ | Exercisable | ​ | Price
$ | 15.19 |  | 16,000 |  | 2.25 years |  | $ | 15.19 |  | — |  | $ | —
​ | 18.12 |  | 19,000 |  | 1.25 years | ​ |  | 18.12 |  | — | ​ |  | —
​ | 20.70 |  | 20,000 |  | 3.25 years | ​ |  | 20.70 |  | — | ​ |  | —
​ | 21.61 |  | 10,500 |  | 0.25 years | ​ |  | 21.61 |  | 10,500 | ​ |  | 21.61
​ | Outstanding, end of period |  | 65,500 |  | 1.95 years | ​ | $ | 18.75 |  | 10,500 | ​ | $ | 21.61
​

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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for stock appreciation rights awards that were outstanding at the beginning and end of the year, and the number of stock appreciation rights awards that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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