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DERIVATIVE INSTRUMENTS - Amount and Market Value of Mortgage Banking Derivatives (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Derivatives, Fair Value [Line Items]
Gain (loss) on derivatives	$ 603		$ (8,964)	$ 0
Gain on securitization of loans	8,900
Noninterest Income, Other	2,205	$ 3,483	3,922	$ 17,141
Notional Amount Assets	101,747		101,747		$ 103,812
Derivatives asset, fair values	4,809		4,809		1,534
Notional Amount Liability	116,216		116,216		103,812
Derivatives liability, fair values	5,553		5,553		1,600
Interest rate swaps and caps on loans
Derivatives, Fair Value [Line Items]
Notional Amount Assets	101,253		101,253		103,812
Derivatives asset, fair values	4,773		4,773		1,534
Notional Amount Liability	101,253		101,253		103,812
Derivatives liability, fair values	5,198		5,198		1,600
Interest rate swaps on mortgage-backed securities
Derivatives, Fair Value [Line Items]
Notional Amount Liability	14,469		14,469		0
Derivatives liability, fair values	325		325		0
Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Notional Amount Assets	494		494		0
Derivatives asset, fair values	36		36		0
Notional Amount Liability	494		494		0
Derivatives liability, fair values	$ 30		$ 30		$ 0

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Nominal or face amount used to calculate payments on the derivative asset.

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