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SHAREHOLDERS' EQUITY AND EARNINGS PER COMMON SHARE - Accumulated Other Comprehensive (Loss) Income (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Total shareholders’ equity $ 1,758,564 $ 1,552,918 $ 1,496,264 $ 1,093,298
Accumulated other comprehensive income/(loss)        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Total shareholders’ equity 11,993 (13,470) 4,161 9,766
Net unrealized holding gain/(loss) on AFS securities        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other accumulated comprehensive (loss)/income, before tax 19,263 (15,267)    
Income taxes related to items of accumulated other comprehensive (loss)/income (5,059) 3,814    
Total shareholders’ equity 14,204 (11,453) 6,008 15,540
Net unrealized holding (loss) on pension plans        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other accumulated comprehensive (loss)/income, before tax (3,023) (2,753)    
Income taxes related to items of accumulated other comprehensive (loss)/income 812 736    
Total shareholders’ equity $ (2,211) $ (2,017) $ (1,847) $ (1,790)