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SHAREHOLDERS' EQUITY AND EARNINGS PER COMMON SHARE - Changes in Each Component of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance $ 1,552,918 $ 1,496,264 $ 1,093,298
Other comprehensive gain/(loss) before reclassifications 25,507 (12,417) (1,925)
Amounts reclassified from accumulated other comprehensive income 44 (143) 3,680
Total other comprehensive income/(loss) 25,463 (12,274) (5,605)
Ending balance 1,758,564 1,552,918 1,496,264
AOCI Attributable to Parent      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance (13,470) 4,161 9,766
Total other comprehensive income/(loss) 25,463 (12,274) (5,605)
Ending balance 11,993 (13,470) 4,161
Net unrealized holding gain/(loss) on AFS securities      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance (11,453) 6,008 15,540
Other comprehensive gain/(loss) before reclassifications 25,701 (12,498) (1,469)
Amounts reclassified from accumulated other comprehensive income 44 4 8,063
Total other comprehensive income/(loss) 25,657 (12,502) (9,532)
Ending balance 14,204 (11,453) 6,008
Net (loss) on effective cash flow hedging derivatives      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance 0    
Other comprehensive gain/(loss) before reclassifications 0    
Amounts reclassified from accumulated other comprehensive income 0    
Total other comprehensive income/(loss) 0    
Ending balance 0 0  
Net (loss) on effective cash flow hedging derivatives      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance 0 0 (3,984)
Other comprehensive gain/(loss) before reclassifications   0 (269)
Amounts reclassified from accumulated other comprehensive income   0 (4,253)
Total other comprehensive income/(loss)   0 3,984
Ending balance   0 0
Net unrealized holding (loss) on pension plans      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance (2,017) (1,847) (1,790)
Other comprehensive gain/(loss) before reclassifications (194) 81 (187)
Amounts reclassified from accumulated other comprehensive income 0 (147) (130)
Total other comprehensive income/(loss) (194) 228 (57)
Ending balance $ (2,211) (2,017) $ (1,847)
Accounting Standards Updates 2016-01 and 2018-02      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Less: amounts reclassified from accumulated other comprehensive income (loss) related to adoption of ASU 2016-01 and ASU 2018-02   5,357  
Accounting Standards Updates 2016-01 and 2018-02 | Net unrealized holding gain/(loss) on AFS securities      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Less: amounts reclassified from accumulated other comprehensive income (loss) related to adoption of ASU 2016-01 and ASU 2018-02   4,959  
Accounting Standards Updates 2016-01 and 2018-02 | Net (loss) on effective cash flow hedging derivatives      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Less: amounts reclassified from accumulated other comprehensive income (loss) related to adoption of ASU 2016-01 and ASU 2018-02   0  
Accounting Standards Updates 2016-01 and 2018-02 | Net unrealized holding (loss) on pension plans      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Less: amounts reclassified from accumulated other comprehensive income (loss) related to adoption of ASU 2016-01 and ASU 2018-02   $ 398