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CAPITAL RATIOS AND SHAREHOLDERS' EQUITY - Changes in AOCI (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Balance at Beginning of Period $ 1,496,264 $ 1,093,298
Other comprehensive (loss) gain before reclassifications (14,231) 1,695
Less: amounts reclassified from accumulated other comprehensive income (loss) 0 3,603
Total other comprehensive loss (14,231) (1,908)
Less: amounts reclassified from accumulated other comprehensive income (loss) related to adoption of ASU 2016-01 and ASU 2018-02 5,357  
Balance at End of Period 1,497,657 1,099,553
Net unrealized holding loss on AFS securities    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Balance at Beginning of Period 6,008 15,541
Other comprehensive (loss) gain before reclassifications (14,231) 1,964
Less: amounts reclassified from accumulated other comprehensive income (loss) 0 7,857
Total other comprehensive loss (14,231) (5,893)
Less: amounts reclassified from accumulated other comprehensive income (loss) related to adoption of ASU 2016-01 and ASU 2018-02 4,959  
Balance at End of Period (13,182) 9,648
Net unrealized loss on cash flow hedging derivatives    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Balance at Beginning of Period 0 (3,985)
Other comprehensive (loss) gain before reclassifications 0 (269)
Less: amounts reclassified from accumulated other comprehensive income (loss) 0 (4,254)
Total other comprehensive loss 0 3,985
Less: amounts reclassified from accumulated other comprehensive income (loss) related to adoption of ASU 2016-01 and ASU 2018-02 0  
Balance at End of Period 0 0
Net unrealized holding loss on pension plans    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Balance at Beginning of Period (1,847) (1,790)
Other comprehensive (loss) gain before reclassifications 0 0
Less: amounts reclassified from accumulated other comprehensive income (loss) 0 0
Total other comprehensive loss 0 0
Less: amounts reclassified from accumulated other comprehensive income (loss) related to adoption of ASU 2016-01 and ASU 2018-02 398  
Balance at End of Period (2,245) (1,790)
Accumulated other comprehensive (loss) income    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Balance at Beginning of Period 4,161 9,766
Total other comprehensive loss (14,231) (1,908)
Balance at End of Period $ (15,427) $ 7,858