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Common Stock (Schedule of changes in number of common stock) (Details) - shares | 6 Months Ended | 12 Months Ended
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Jun. 30, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Equity [Abstract] |  |  |  |  |
Shares outstanding, beginning | 22,119,380 | 21,318,638 | 22,119,380 | 22,192,894 |
Treasury shares repurchased through stock repurchase authorization | (402,056) | (225,205) | (856,499) | (116,034) | (191,265)
Issuance of treasury shares for vesting of stock awards |  | 102,060 | 31,442 | 18,205 |
Issuance of shares related to employee stock ownership plan |  | 24,315 | 24,315 | 24,315 |
Shares outstanding, ending |  | 21,219,808 | 21,318,638 | 22,119,380 | 22,192,894

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- Definition Issuance of treasury shares for vesting of restricted stock units. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition This item represents the number of shares provided to the Employee Stock Ownership Plan (ESOP) during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109244661&loc=d3e17540-113929 + Details
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- References No definition available. + Details
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- Definition Number of shares issued which are neither cancelled nor held in the treasury. + References No definition available. + Details
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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21463-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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