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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Derivative Assets and Liabilities (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017 | Feb. 07, 2017
Interest rate swap agreements and non-hedging derivative assets and liabilities |  |  |
Notional amount | $ 2,797,967 | $ 2,510,937 |
Estimated fair value asset (liability) | 4,520 | 3,470 |
Interest rate swaps |  |  |
Interest rate swap agreements and non-hedging derivative assets and liabilities |  |  |
Notional amount | 10,600 |  |
Total cash flow hedges | Interest rate swaps | FHLB borrowings |  |  |
Interest rate swap agreements and non-hedging derivative assets and liabilities |  |  |
Notional amount | 300,000 |  | $ 300,000
Total economic hedges |  |  |
Interest rate swap agreements and non-hedging derivative assets and liabilities |  |  |
Notional amount | 2,500,000 |  |
Total economic hedges | Interest rate swaps |  |  |
Interest rate swap agreements and non-hedging derivative assets and liabilities |  |  |
Notional amount | 2,000,000 |  |
Total economic hedges | Risk participation agreements with dealer banks |  |  |
Interest rate swap agreements and non-hedging derivative assets and liabilities |  |  |
Notional amount | 200,000 |  |
Total economic hedges | Forward sale commitments |  |  |
Interest rate swap agreements and non-hedging derivative assets and liabilities |  |  |
Notional amount | 300,000 |  |
Designated as Hedging Instrument | Total cash flow hedges |  |  |
Interest rate swap agreements and non-hedging derivative assets and liabilities |  |  |
Notional amount | 0 | 0 |
Estimated fair value asset (liability) | 0 | 0 |
Designated as Hedging Instrument | Total cash flow hedges | Interest rate swaps | FHLB borrowings |  |  |
Interest rate swap agreements and non-hedging derivative assets and liabilities |  |  |
Notional amount | $ 0 | $ 0 |
Weighted average maturity | 0 years | 0 years |
Weighted average rate, received (as percent) | 0.00% | 0.00% |
Weighted average rate, contract pay rate (as percent) | 0.00% | 0.00% |
Estimated fair value asset (liability) | $ 0 | $ 0 |
Designated as Hedging Instrument | Total economic hedges |  |  |
Interest rate swap agreements and non-hedging derivative assets and liabilities |  |  |
Notional amount | 2,501,720 | 2,316,971 |
Estimated fair value asset (liability) | (2,011) | (1,789) |
Designated as Hedging Instrument | Total economic hedges | Interest rate swaps | Tax advantaged economic development bonds |  |  |
Interest rate swap agreements and non-hedging derivative assets and liabilities |  |  |
Notional amount | $ 10,590 | $ 10,755 |
Weighted average maturity | 11 years 8 months 15 days | 11 years 10 months 24 days |
Weighted average rate, received (as percent) | 2.03% | 1.73% |
Weighted average rate, contract pay rate (as percent) | 5.09% | 5.09% |
Estimated fair value asset (liability) | $ (1,338) | $ (1,649) |
Designated as Hedging Instrument | Total economic hedges | Interest rate swaps | Loans with commercial loan customers |  |  |
Interest rate swap agreements and non-hedging derivative assets and liabilities |  |  |
Notional amount | $ 1,006,921 | $ 943,795 |
Weighted average maturity | 5 years 9 months 12 days | 5 years 10 months 12 days |
Weighted average rate, received (as percent) | 3.54% | 3.26% |
Weighted average rate, contract pay rate (as percent) | 4.33% | 4.25% |
Estimated fair value asset (liability) | $ 11,474 | $ (3,195) |
Designated as Hedging Instrument | Total economic hedges | Reverse interest rate swaps | Loans with commercial loan customers |  |  |
Interest rate swap agreements and non-hedging derivative assets and liabilities |  |  |
Notional amount | $ 1,006,921 | $ 943,795 |
Weighted average maturity | 5 years 9 months 12 days | 5 years 10 months 12 days |
Weighted average rate, received (as percent) | 4.33% | 4.25% |
Weighted average rate, contract pay rate (as percent) | 3.54% | 3.26% |
Estimated fair value asset (liability) | $ (11,228) | $ 3,204 |
Designated as Hedging Instrument | Total economic hedges | Risk participation agreements with dealer banks |  |  |
Interest rate swap agreements and non-hedging derivative assets and liabilities |  |  |
Notional amount | $ 167,795 | $ 142,054 |
Weighted average maturity | 7 years | 8 years 4 months 20 days |
Estimated fair value asset (liability) | $ (10) | $ (26) |
Designated as Hedging Instrument | Total economic hedges | Forward sale commitments |  |  |
Interest rate swap agreements and non-hedging derivative assets and liabilities |  |  |
Notional amount | $ 309,493 | $ 276,572 |
Weighted average maturity | 2 months 12 days | 2 months 12 days |
Estimated fair value asset (liability) | $ (909) | $ (123) |
Not Designated as Hedging Instrument |  |  |
Interest rate swap agreements and non-hedging derivative assets and liabilities |  |  |
Notional amount | 296,247 | 193,966 |
Estimated fair value asset (liability) | 6,531 | 5,259 |
Not Designated as Hedging Instrument | Commitments to lend |  |  |
Interest rate swap agreements and non-hedging derivative assets and liabilities |  |  |
Notional amount | $ 296,247 | $ 193,966 |
Weighted average maturity | 2 months 12 days | 2 months 12 days |
Estimated fair value asset (liability) | $ 6,531 | $ 5,259 |

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