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Benefit Plans, Other Plans (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Employee Savings/Retirement 401(k) Plan [Member] |  |  |
Other Plans [Abstract] |  |  |
Employer matching contribution percentage | 100.00% |  |
Employer matching contribution, percent of employee contribution | 4.00% |  |
Maximum employer matching contribution per participant | $ 11,200 |  |
Employer contributions | 4,069,000 | $ 5,173,000 | $ 4,770,000
Deferred Compensation Plan [Member] |  |  |
Other Plans [Abstract] |  |  |
Employer matching contribution | 43,000 | 61,000 | $ 55,000
Deferred Compensation Plan [Member] | Other Assets [Member] |  |  |
Other Plans [Abstract] |  |  |
Plans' assets | 7,949,000 | 7,530,000 |
Deferred Compensation Plan [Member] | Other Liabilities [Member] |  |  |
Other Plans [Abstract] |  |  |
Recorded liability | $ 8,063,000 | $ 7,540,000 |

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- Definition Maximum amount employer contributes as a matching contribution to a defined contribution plan. + References No definition available. + Details
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Balance Type: | debit
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- Definition Amount of contributions made by employer into fund established for purposes of making future disbursement to individual in accordance with deferred compensation arrangement. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
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- Definition Aggregate carrying value as of the balance sheet date of the liabilities for deferred compensation arrangements payable after one year (or the normal operating cycle, if longer). Represents currently earned compensation under cash arrangements (such as a profit-sharing plan, rabbi trust, and employee contract--excluding equity-based arrangements) that is not actually paid until a later date. + References No definition available. + Details
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- Definition Carrying amount as of the balance sheet date of assets held under deferred compensation agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
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- References No definition available. + Details
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- Details
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- Details
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