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MORTGAGE SERVICING RIGHTS - Servicing Asset at Amortized Cost (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Servicing Asset at Amortized Cost, Balance [Roll Forward] |  |  |
Beginning of period | $ 3,252 |  |
Increase in mortgage servicing rights resulting from transfers of financial assets | (297) | $ (182) |
End of period | 3,999 |  | $ 3,252
Mortgage servicing rights |  |  |
Servicing Asset at Amortized Cost, Balance [Roll Forward] |  |  |
Beginning of period | 5,266 | 4,541 | 4,541
Increase in mortgage servicing rights resulting from transfers of financial assets | 297 |  | 2,020
Amortization during the period | (439) |  | (1,295)
End of period | 5,124 |  | 5,266
Valuation Allowance for Impairment of Recognized Servicing Assets [Roll Forward] |  |  |
Valuation allowance, beginning of period | (2,014) | $ (259) | (259)
Additions | 0 |  | (1,755)
Recoveries | 889 |  | 0
Balance at beginning of period | (1,125) |  | (2,014)
Mortgage servicing rights, net | 3,999 |  | 3,252
Fair value of mortgage servicing rights; end of period | 4,005 |  | 3,285
Residential mortgage loans serviced for others | $ 551,622 |  | $ 553,655
Net book value of MSR asset to loans serviced for others (as a percent) | 0.73% |  | 0.59%

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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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- Definition Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745 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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=116651436&loc=d3e122625-111746 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -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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