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COMMITMENTS, CONTINGENCIES AND DERIVATIVES (Summary of Contractual and Notional Amounts of Financial Instruments) (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
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Customer Loan Swaps |  |
Financial Instruments [Line Items] |  |
Notional amount of derivative | $ 802,580 | $ 833,030
Forward-Starting Interest Rate Swap |  |
Financial Instruments [Line Items] |  |
Notional amount of derivative | 0 | 25,000
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 | 22,840 | 12,077
Forward Contracts [Member] |  |
Financial Instruments [Line Items] |  |
Notional amount of derivative | 8,711 | 4,315
Standby Letters of Credit [Member] |  |
Financial Instruments [Line Items] |  |
Contractual Amounts Of Financial Instrument | 5,938 | 3,063
Commitments to Extend Credit [Member] |  |
Financial Instruments [Line Items] |  |
Contractual Amounts Of Financial Instrument | $ 669,193 | $ 654,575

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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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