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DERIVATIVE INSTRUMENTS - Amount and Market Value of Mortgage Banking Derivatives (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Notional Amount Assets	$ 97,451	$ 70,486
Derivatives asset, fair values	2,099	1,005
Notional Amount Liability	97,451	70,486
Derivatives liability, fair values	2,064	1,033
Interest rate swaps and caps on loans
Derivatives, Fair Value [Line Items]
Notional Amount Assets	97,451	70,486
Derivatives asset, fair values	2,099	1,005
Notional Amount Liability	97,451	70,486
Derivatives liability, fair values	$ 2,064	$ 1,033

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