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Employee Benefits, Stock-Based Compensation (Details) | 1 Months Ended | 12 Months Ended
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Jan. 31, 2016 shares | Dec. 31, 2020 USD ($) Plan $ / shares shares | Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) $ / shares shares
Stock-based Compensation [Abstract] |  |  |  |  |  |  |
Number of active incentive stock option plan | Plan |  |  | 1 |  |  |  |
Number of inactive incentive stock option plan | Plan |  |  | 1 |  |  |  |
Number of shares to be issued upon exercise of outstanding stock-based awards and remaining shares available for future issuance [Abstract] |  |  |  |  |  |  |
Shares available for future issuance (in shares) |  |  | 460,000 |  |  |  |
Unrecognized compensation cost, grant date fair value of vested shares, cash received from option exercises, and actual tax benefit realized [Abstract] |  |  |  |  |  |  |
Unrecognized compensation cost of unvested share-based compensation arrangements granted under the plan at year-end | $ |  |  | $ 1,512,000 | $ 1,410,000 |  | $ 1,072,000 |
Grant date fair value of shares vested for the year | $ |  |  | 887,000 | 605,000 |  | 645,000 |
Cash received from option exercises under all share-based payment arrangements for the year | $ |  |  | 11,000 | 401,000 |  | 399,000 |
Tax benefit realized for the tax deductions from option exercises of the share-based payment arrangements for the year | $ |  |  | $ 1,000 | $ 27,000 |  | $ 49,000 |
Expected period for recognition of unrecognized compensation cost |  |  | 2 years 6 months |  |  |  |
Stock Options [Member] |  |  |  |  |  |  |
Number of shares to be issued upon exercise of outstanding stock-based awards and remaining shares available for future issuance [Abstract] |  |  |  |  |  |  |
Number of shares to be issued upon exercise (in shares) |  |  | 20,000 |  |  |  |
Weighted average price (in dollars per share) | $ / shares |  |  | $ 32.27 |  |  |  |
Grants (in shares) |  |  | 0 | 0 |  | 0 |
Shares available for future issuance (in shares) | [1] |  | 460,000 |  |  |  |
Restricted Stock [Member] |  |  |  |  |  |  |
Stock-based Compensation [Abstract] |  |  |  |  |  |  |
Shares authorized (in shares) |  |  | 550,000 |  |  |  |
Number of shares to be issued upon exercise of outstanding stock-based awards and remaining shares available for future issuance [Abstract] |  |  |  |  |  |  |
Number of shares to be issued upon exercise (in shares) | [2] |  |  |  |  |  |
Weighted average price (in dollars per share) | $ / shares | [3] |  |  |  |  |  |
Maximum number of shares to be grant to a participant (in shares) |  |  | 75,000 |  |  |  |
Shares available for future issuance (in shares) | [1] |  |  |  |  |  |
Performance Units [Member] |  |  |  |  |  |  |
Stock-based Compensation [Abstract] |  |  |  |  |  |  |
Number of shares issued to date (in shares) |  |  | 0 |  |  |  |
Number of shares to be issued upon exercise of outstanding stock-based awards and remaining shares available for future issuance [Abstract] |  |  |  |  |  |  |
Number of shares to be issued upon exercise (in shares) | [4] |  |  |  |  |  |
Weighted average price (in dollars per share) | $ / shares | [3] |  |  |  |  |  |
Maximum amount of shares to be grant to a participant | $ |  |  | $ 1,000,000 |  |  |  |
Shares available for future issuance (in shares) | [1] |  |  |  |  |  |
Stock Appreciation Rights (SARs) [Member] |  |  |  |  |  |  |
Stock-based Compensation [Abstract] |  |  |  |  |  |  |
Number of shares issued to date (in shares) |  |  | 0 |  |  |  |
Number of shares to be issued upon exercise of outstanding stock-based awards and remaining shares available for future issuance [Abstract] |  |  |  |  |  |  |
Number of shares to be issued upon exercise (in shares) | [5] |  |  |  |  |  |
Weighted average price (in dollars per share) | $ / shares | [3] |  |  |  |  |  |
Maximum number of shares to be grant to a participant (in shares) |  |  | 100,000 |  |  |  |
Shares available for future issuance (in shares) | [1] |  |  |  |  |  |
2015 Plan [Member] |  |  |  |  |  |  |
Stock-based Compensation [Abstract] |  |  |  |  |  |  |
Shares authorized (in shares) |  |  | 550,000 |  |  |  |
Number of shares issued to date (in shares) |  |  | 94,453 |  |  |  |
Number of shares to be issued upon exercise of outstanding stock-based awards and remaining shares available for future issuance [Abstract] |  |  |  |  |  |  |
Shares available, beginning of period (in shares) |  |  | 481,396 |  |  |  |
Forfeitures (in shares) |  |  | 0 |  |  |  |
Shares available for future issuance (in shares) |  |  | 459,852 | 481,396 |  |  |
2015 Plan [Member] | Stock Options [Member] |  |  |  |  |  |  |
Number of shares to be issued upon exercise of outstanding stock-based awards and remaining shares available for future issuance [Abstract] |  |  |  |  |  |  |
Grants (in shares) |  |  | 0 | 0 |  | 0 |
Number of shares with accelerated vesting (in shares) |  |  |  |  |  | 10,000 |
Options, number of shares [Roll Forward] |  |  |  |  |  |  |
Outstanding at beginning of year (in shares) |  |  | 0 | 0 | [6] | 10,000 | [6]
Granted (in shares) |  |  | 0 | 0 |  | 0 | [6]
Exercised (in shares) |  |  | 0 | 0 |  | (10,000) | [6]
Forfeited/expired (in shares) |  |  | 0 | 0 |  | 0 | [6]
Outstanding at end of year (in shares) |  |  | 0 | 0 |  | 0 | [6]
Exercisable at end of year (in shares) |  |  | 0 | 0 |  | 0 | [6]
Options, weighted average exercise price [Abstract] |  |  |  |  |  |  |
Outstanding, beginning of period (in dollars per share) | $ / shares |  |  | $ 0 | $ 0 | [6] | $ 33.55 | [6]
Granted (in dollars per share) | $ / shares |  |  | 0 | 0 |  | 0 | [6]
Exercised (in dollars per share) | $ / shares |  |  | 0 | 0 |  | 33.55 | [6]
Forfeited/expired (in dollars per share) | $ / shares |  |  | 0 | 0 |  | 0 | [6]
Outstanding, end of period (in dollars per share) | $ / shares |  |  | 0 | 0 |  | 0 | [6]
Exercisable, end of period (in dollars per share) | $ / shares |  |  | $ 0 | $ 0 |  | $ 0 | [6]
Nonvested options, number of shares [Roll Forward] |  |  |  |  |  |  |
Granted (in shares) |  |  | 0 | 0 |  | 0 | [6]
Options, additional disclosures [Abstract] |  |  |  |  |  |  |
Intrinsic value of options exercised | $ |  |  | $ 0 | $ 0 |  | $ 140,000 |
Intrinsic value of options exercisable | $ |  |  | 0 | 0 |  | 0 |
Intrinsic value of outstanding options | $ |  |  | $ 0 | $ 0 |  | $ 0 |
2015 Plan [Member] | Restricted Stock [Member] |  |  |  |  |  |  |
Number of shares to be issued upon exercise of outstanding stock-based awards and remaining shares available for future issuance [Abstract] |  |  |  |  |  |  |
Shares issued (in shares) |  | 18,069 |  |  |  |  |
Grants (in shares) |  |  | (21,544) |  |  |  |
Restricted stock activity, grants [Roll Forward] |  |  |  |  |  |  |
Outstanding at beginning of year (in shares) |  |  | 50,992 | 34,255 |  | 33,085 |
Granted (in shares) |  |  | 21,544 | 27,921 |  | 11,320 |
Vested (in shares) |  |  | (16,985) | (10,596) |  | (8,761) |
Forfeited (in shares) |  |  | 0 | (588) |  | (1,389) |
Outstanding at end of year (in shares) |  |  | 55,551 | 50,992 |  | 34,255 |
Restricted stock activity, weighted average fair value at grant [Roll Forward] |  |  |  |  |  |  |
Outstanding at beginning of year (in dollars per share) | $ / shares |  |  | $ 43.08 | $ 44.46 |  | $ 41.84 |
Granted (in dollars per share) | $ / shares |  |  | 44.64 | 41.12 |  | 49.30 |
Vested (in dollars per share) | $ / shares |  |  | 41.92 | 42.39 |  | 40.46 |
Forfeited (in dollars per share) | $ / shares |  |  | 0 | 43.04 |  | 46.77 |
Outstanding at end of year (in dollars per share) | $ / shares |  |  | $ 44.04 | $ 43.08 |  | $ 44.46 |
2006 Plan [Member] | Stock Options [Member] |  |  |  |  |  |  |
Options, number of shares [Roll Forward] |  |  |  |  |  |  |
Outstanding at beginning of year (in shares) |  |  | 20,495 | 32,571 |  | 35,376 |
Granted (in shares) |  |  | 0 | 0 |  | 0 |
Exercised (in shares) |  |  | (495) | (12,076) |  | (2,475) |
Forfeited/expired (in shares) |  |  | 0 | 0 |  | (330) |
Outstanding at end of year (in shares) |  |  | 20,000 | 20,495 |  | 32,571 |
Exercisable at end of year (in shares) |  |  | 20,000 | 495 |  | 2,571 |
Options, weighted average exercise price [Abstract] |  |  |  |  |  |  |
Outstanding, beginning of period (in dollars per share) | $ / shares |  |  | $ 32.04 | $ 32.47 |  | $ 31.90 |
Granted (in dollars per share) | $ / shares |  |  | 0 | 0 |  | 0 |
Exercised (in dollars per share) | $ / shares |  |  | 22.81 | 33.19 |  | 25.52 |
Forfeited/expired (in dollars per share) | $ / shares |  |  | 0 | 0 |  | 23.79 |
Outstanding, end of period (in dollars per share) | $ / shares |  |  | 32.27 | 32.04 |  | 32.47 |
Exercisable, end of period (in dollars per share) | $ / shares |  |  | $ 32.27 | $ 22.81 |  | $ 25.11 |
Nonvested options, number of shares [Roll Forward] |  |  |  |  |  |  |
Nonvested, beginning of period (in shares) |  |  | 20,000 |  |  |  |
Granted (in shares) |  |  | 0 | 0 |  | 0 |
Vested (in shares) |  |  | 20,000 |  |  |  |
Forfeited (in shares) |  |  | 0 |  |  |  |
Nonvested, end of period (in shares) |  |  | 0 | 20,000 |  |  |
Nonvested options, weighted average grant date fair value [Abstract] |  |  |  |  |  |  |
Nonvested, beginning of period (in dollars per share) | $ / shares |  |  | $ 6.59 |  |  |  |
Granted (in dollars per share) | $ / shares |  |  | 0 |  |  |  |
Vested (in dollars per share) | $ / shares |  |  | 6.59 |  |  |  |
Forfeited (in dollars per share) | $ / shares |  |  | 0 |  |  |  |
Nonvested, end of period (in dollars per share) | $ / shares |  |  | $ 0 | $ 6.59 |  |  |
Options, additional disclosures [Abstract] |  |  |  |  |  |  |
Weighted average remaining contractual term |  |  | 4 years 1 month 6 days |  |  |  |
Intrinsic value of options exercised | $ |  |  | $ 11,000 | $ 135,000 |  | $ 56,000 |
Intrinsic value of options exercisable | $ |  |  | 96,000 | 12,000 |  | 37,000 |
Intrinsic value of outstanding options | $ |  |  | $ 96,000 | $ 299,000 |  | $ 233,000 |
2006 Plan [Member] | Restricted Stock [Member] |  |  |  |  |  |  |
Restricted stock activity, grants [Roll Forward] |  |  |  |  |  |  |
Outstanding at beginning of year (in shares) |  |  | 0 | 2,064 |  | 5,426 |
Granted (in shares) |  |  | 0 | 0 |  | 0 |
Vested (in shares) |  |  | 0 | (2,064) |  | (3,236) |
Forfeited (in shares) |  |  | 0 | 0 |  | (126) |
Outstanding at end of year (in shares) |  |  | 0 | 0 |  | 2,064 |
Restricted stock activity, weighted average fair value at grant [Roll Forward] |  |  |  |  |  |  |
Outstanding at beginning of year (in dollars per share) | $ / shares |  |  | $ 0 | $ 32.27 |  | $ 33.24 |
Granted (in dollars per share) | $ / shares |  |  | 0 | 0 |  | 0 |
Vested (in dollars per share) | $ / shares |  |  | 0 | 32.27 |  | 33.90 |
Forfeited (in dollars per share) | $ / shares |  |  | 0 | 0 |  | 32.27 |
Outstanding at end of year (in dollars per share) | $ / shares |  |  | $ 0.00 | $ 0 |  | $ 32.27 |
[1] | Under the 2015 Plan, 550,000 shares are authorized for issuance; 94,453 have been issued as of December 31, 2020 In January of 2016, 18,069 restricted stock shares were issued under the terms of the 2015 Plan pursuant to awards granted under the 2006 Plan. Additional shares will not be issued pursuant to awards granted from prior plans.
[2] | The maximum number of shares of restricted stock that may be granted is 550,000 shares, and the maximum that may be granted to a participant during any calendar year is 75,000 shares.
[3] | Not applicable
[4] | No performance units payable in stock had been issued as of December 31, 2020. The maximum payment that can be made pursuant to performance units granted to any one participant in any calendar year is $1,000,000.
[5] | No SARS have been issued. The maximum number of shares with respect to which SARs may be granted to a participant during any calendar year is 100,000 shares.
[6] | Pursuant to the 2015 Plan provisions, the death of the option holder accelerated the vesting of 10,000 shares in 2018.

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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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 The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired. + 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)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average price of options that were either forfeited or expired. + 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)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + 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 Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + 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)(i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Number of fully vested and expected to vest exercisable options that may be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + 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 (e)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable. + 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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