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GOODWILL, OTHER INTANGIBLE ASSETS AND MORTGAGE SERVICING RIGHTS (Mortgage Servicing Rights) (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Servicing Asset at Amortized Value, Balance [Roll Forward] |  |  |  |
Servicing Asset at Amortized Cost, Additions, Acquisitions |  | $ 27 | $ 63 |
Servicing Contracts [Member] |  |  |  |
Morgage Servicing Rights at Amortized Value [Line Items] |  |  |  |
Loans Serviced For Others |  | 2,650,000 |  | $ 2,640,000
Custodial Accounts |  | 3,700 |  | $ 3,800
Servicing Asset at Amortized Value, Balance [Roll Forward] |  |  |  |
Balance, net of valuation allowance, beginning of the period |  | 15,223 | 14,148 |
Additions—amounts capitalized |  | 2,010 | 1,420 |
Amortization | [1] | (1,853) | (1,354) |
Balance, net of valuation allowance, end of the period | [2] | 15,407 | $ 14,277 |
Valuation allowance, end of period |  | $ 0 |  |
[1] | Amortization of mortgage servicing rights is recorded as a reduction of loan servicing income within mortgage banking operations and any unamortized balance is fully amortized if the loan repays in full.
[2] | There was no valuation allowance as of both March 31, 2021 and 2020.

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- Definition Amortized amount of contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=116651436&loc=d3e122739-111746 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122492-111745 Reference 3: http://www.xbrl.org/2003/role/recommendedDisclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745 + Details
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