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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 |

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- Definition Amount of the cost of borrowed funds accounted for as interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.9) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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