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SHAREHOLDERS' EQUITY AND EARNINGS PER COMMON SHARE - Amounts Reclassified Out of Each Component of Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Non-interest income $ 23,362 $ 21,406 $ 17,512 $ 21,722 $ 15,775 $ 20,034 $ 19,623 $ 18,892 $ 84,002 $ 74,324 $ 74,244
Interest expense (34,108) (36,854) (37,643) (35,650) (33,929) (29,184) (25,192) (21,389) (144,255) (109,694) (64,113)
Non-interest expense 91,333 96,871 91,595 85,459 92,766 88,385 90,292 84,757 365,258 356,200 290,963
Tax expense (benefit) $ (6,421) $ (4,007) $ (5,118) $ (6,917) $ (4,384) $ (9,095) $ (8,145) $ (7,337) (22,463) (28,961) (42,088)
Income available to common shareholders                 96,490 104,847 55,028
Reclassification out of Accumulated Other Comprehensive Income                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Income available to common shareholders                 44 (143) 3,680
Realized gains/(losses) on AFS securities | Reclassification out of Accumulated Other Comprehensive Income                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Non-interest income                 61 6 12,598
Tax expense (benefit)                 (17) (2) (4,535)
Income available to common shareholders                 44 4 8,063
Net (loss) on effective cash flow hedging derivatives | Reclassification out of Accumulated Other Comprehensive Income                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Non-interest income                 0    
Interest expense                 0    
Non-interest expense                 0    
Tax expense (benefit)                 0    
Income available to common shareholders                 0    
Net (loss) on effective cash flow hedging derivatives | Reclassification out of Accumulated Other Comprehensive Income                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Non-interest income                   0 (6,629)
Interest expense                   0 (393)
Non-interest expense                   0 0
Tax expense (benefit)                   0 2,769
Income available to common shareholders                   0 (4,253)
Realized (losses) on pension plans | Reclassification out of Accumulated Other Comprehensive Income                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Non-interest expense                 0 (201) (217)
Tax expense (benefit)                 0 54 87
Income available to common shareholders                 $ 0 $ (147) $ (130)