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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Amounts included in Consolidated Statements of Income and in Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Derivative [Line Items]                      
Less: Reclassification of unrealized (loss) from accumulated other comprehensive loss to interest expense $ (13,276) $ (12,540) $ (11,577) $ (10,779) $ (9,676) $ (8,481) $ (7,766) $ (7,258) $ (48,172) $ (33,181) $ (28,351)
Net interest expense recognized in interest expense on hedged FHLBB borrowings                 17,289 10,233 $ 9,166
Interest Rate Swap | Cash Flow Hedging                      
Derivative [Line Items]                      
Other comprehensive income recorded in accumulated other comprehensive income, net of reclassification adjustments and tax effects                 1,123 (3,138)  
FHLBB borrowings | Interest Rate Swap | Cash Flow Hedging                      
Derivative [Line Items]                      
Unrealized (loss) recognized in accumulated other comprehensive loss                 (2,023) (5,232)  
Less: Reclassification of unrealized (loss) from accumulated other comprehensive loss to interest expense                 (3,981) 0  
Net tax effect on items recognized in accumulated other comprehensive income                 835 2,094  
Net interest expense recognized in interest expense on hedged FHLBB borrowings                 $ 3,981 $ 0