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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Derivative Assets and Liabilities (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018
Interest rate swap agreements and non-hedging derivative assets and liabilities |  |
Notional amount | $ 4,422,594 | $ 3,303,570
Estimated fair value asset (liability) | 4,826 | 1,680
Interest rate swaps |  |
Interest rate swap agreements and non-hedging derivative assets and liabilities |  |
Notional amount | 10,700 |
Total economic hedges |  |
Interest rate swap agreements and non-hedging derivative assets and liabilities |  |
Notional amount | 4,000,000 |
Total economic hedges | Interest rate swaps |  |
Interest rate swap agreements and non-hedging derivative assets and liabilities |  |
Notional amount | 3,100,000 |
Total economic hedges | Risk participation agreements with dealer banks |  |
Interest rate swap agreements and non-hedging derivative assets and liabilities |  |
Notional amount | 300,000 |
Total economic hedges | Forward sale commitments |  |
Interest rate swap agreements and non-hedging derivative assets and liabilities |  |
Notional amount | 500,000 |
Designated as Hedging Instrument | Total economic hedges |  |
Interest rate swap agreements and non-hedging derivative assets and liabilities |  |
Notional amount | 3,951,138 | 3,138,491
Estimated fair value asset (liability) | (4,179) | (2,247)
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 | $ 9,744 | $ 10,090
Weighted average maturity | 10 years 4 months 24 days | 10 years 10 months 24 days
Weighted average rate, received | 2.81% | 2.72%
Weighted average rate, contract pay rate | 5.09% | 5.09%
Estimated fair value asset (liability) | $ (1,583) | $ (1,240)
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 | $ 1,546,563 | $ 1,346,894
Weighted average maturity | 6 years 8 months 12 days | 6 years 8 months 12 days
Weighted average rate, received | 4.47% | 4.53%
Weighted average rate, contract pay rate | 3.89% | 4.04%
Estimated fair value asset (liability) | $ 75,114 | $ 11,443
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 | $ 1,546,563 | $ 1,346,894
Weighted average maturity | 6 years 8 months 12 days | 6 years 8 months 12 days
Weighted average rate, received | 3.89% | 4.04%
Weighted average rate, contract pay rate | 4.47% | 4.53%
Estimated fair value asset (liability) | $ (76,909) | $ (11,953)
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 | $ 303,793 | $ 243,806
Weighted average maturity | 7 years 6 months | 5 years 8 months 12 days
Estimated fair value asset (liability) | $ 343 | $ 237
Designated as Hedging Instrument | Total economic hedges | Forward sale commitments |  |
Interest rate swap agreements and non-hedging derivative assets and liabilities |  |
Notional amount | $ 544,475 | $ 190,807
Weighted average maturity | 6 days | 6 days
Estimated fair value asset (liability) | $ (1,144) | $ (734)
Not Designated as Hedging Instrument |  |
Interest rate swap agreements and non-hedging derivative assets and liabilities |  |
Notional amount | 471,456 | 165,079
Estimated fair value asset (liability) | 9,005 | 3,927
Not Designated as Hedging Instrument | Commitments to lend |  |
Interest rate swap agreements and non-hedging derivative assets and liabilities |  |
Notional amount | $ 471,456 | $ 165,079
Weighted average maturity | 6 days | 6 days
Estimated fair value asset (liability) | $ 9,005 | $ 3,927

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=117331979&loc=d3e41228-113958 + Details
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