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PENSION AND OTHER POSTRETIREMENT PLANS - 401k Plan (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
PENSION AND OTHER POSTRETIREMENT PLANS. |  |  |
Labor and Related Expense | $ 56,244,000 | $ 50,458,000 | $ 46,560,000
Participants contribution | $ 19,000 |  |
Description of Defined Contribution Pension and Other Postretirement Plans | 100% of each employee's contributions up to 1% of each employee's compensation plus 50% of each employee's contributions over 1% but not in excess of 6% of each employee's compensation for a maximum contribution of 3.5% of a participating employee's compensation |  |
Minimum employee contribution percentage | 1.00% |  |
Percentage of employer matching contribution | 50.00% |  |
Threshold limit percentage of employee compensation | 6.00% |  |
Maximum percentage of annual contribution per employee | 3.50% |  |
Cash contributions by the Bank | $ 1,100,000 | 1,000,000 | 1,000,000
Discretionary profit sharing contribution | $ 583,000 | $ 497,000 | $ 550,000

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- Definition Minimum percentage of employee gross pay, by the terms of the plan, that the employer may contribute to a defined contribution plan. + References No definition available. + Details
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- Definition This element represents the threshold limit in percentage of employees' compensation eligible for employer matching contributions. + References No definition available. + Details
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- References No definition available. + Details
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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + 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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- Definition Maximum amount the employee may contribute to a defined contribution plan. + References No definition available. + Details
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- Definition Description of defined contribution pension and other postretirement plans. + References No definition available. + Details
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- Definition Amount of expense for salary, wage, profit sharing; incentive and equity-based compensation; and other employee benefit. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(b)(4)) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 + Details
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