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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)