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COMMITMENTS, CONTINGENCIES AND DERIVATIVES (Summary of Contractual and Notional Amounts of Financial Instruments) (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Customer Loan Swaps |  |
Financial Instruments [Line Items] |  |
Notional amount of derivative | $ 793,212 | $ 703,336
Forward-Starting Interest Rate Swap |  |
Financial Instruments [Line Items] |  |
Notional amount of derivative | 25,000 | 50,000
Interest rate swaps |  |
Financial Instruments [Line Items] |  |
Notional amount of derivative | 43,000 | 43,000
Interest rate lock commitments |  |
Financial Instruments [Line Items] |  |
Notional amount of derivative | 23,519 | 21,746
Forward Contracts [Member] |  |
Financial Instruments [Line Items] |  |
Notional amount of derivative | 10,188 | 8,065
Other Commitments |  |
Financial Instruments [Line Items] |  |
Notional amount of derivative | 2,478 | 523
Letters of Credit |  |
Financial Instruments [Line Items] |  |
Notional amount of derivative | 2,676 | 2,848
Home Equity |  |
Financial Instruments [Line Items] |  |
Notional amount of derivative | 495,086 | 477,401
Commercial and commercial real estate |  |
Financial Instruments [Line Items] |  |
Notional amount of derivative | 29,443 | 49,482
Residential |  |
Financial Instruments [Line Items] |  |
Notional amount of derivative | $ 44,624 | $ 41,368

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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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