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SHAREHOLDERS' EQUITY AND EARNINGS PER COMMON SHARE - Amounts Reclassified Out of AOCI (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Non-interest income | $ 14,723 | $ 10,102 | $ 9,710 | $ 8,421 | $ 7,806 | $ 7,643 | $ 7,453 | $ 6,167 | $ 42,956 | $ 29,069 | $ 27,935
Non-interest expense | (27,816) | (22,419) | (22,266) | (22,359) | (26,803) | (23,400) | (20,906) | (18,624) | (94,860) | (89,733) | (75,539)
Salaries and employee benefits |  |  |  |  |  |  |  |  | (48,920) | (45,000) | (40,964)
Tax expense | $ (2,269) | $ (2,146) | $ (2,199) | $ (1,793) | $ (362) | $ (780) | $ (1,364) | $ (1,703) | (8,407) | (4,209) | (7,562)
Available-for-sale Securities, Gross Realized Gains |  |  |  |  |  |  |  |  | 5,492 | 993 |
Available-for-sale Securities, Gross Realized Losses |  |  |  |  |  |  |  |  | 47 | 756 | 924
Net unrealized gain (loss) on AFS securities | Reclassification out of AOCI |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Non-interest income |  |  |  |  |  |  |  |  | 5,445 | 237 | (924)
Tax expense |  |  |  |  |  |  |  |  | (1,291) | (55) | 216
Net of tax |  |  |  |  |  |  |  |  | 4,154 | 182 | (708)
Net unrealized loss on effective derivative hedges | Reclassification out of AOCI |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Non-interest income |  |  |  |  |  |  |  |  | 4,852 | (3,156) |
Tax expense |  |  |  |  |  |  |  |  | (917) | 737 |
Net of tax |  |  |  |  |  |  |  |  | $ 3,935 | $ (2,419) |
Net unrealized gain (loss) on post-retirement plans | Reclassification out of AOCI |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Salaries and employee benefits |  |  |  |  |  |  |  |  |  |  | (29)
Tax expense |  |  |  |  |  |  |  |  |  |  | 7
Net of tax |  |  |  |  |  |  |  |  |  |  | $ (22)

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