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FAIR VALUE - Fair Value (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017
Assets:
Investment securities available for sale	$ 1,803,688		$ 1,942,568
Held To Maturity Securities	144,672		144,815
Equity securities	44,227		44,530
Total gross loans held for investment portfolio	9,113,955		8,858,123	$ 8,640,291
Less: allowance for loan and lease losses	(172,011)	$ (183,732)	(196,362)	$ (222,035)	$ (225,856)	$ (231,843)
Loans held for investment, net	8,941,944		8,661,761
Liabilities:
Other borrowings	184,150		184,150
Carrying Reported Amount Fair Value Disclosure [Member]
Assets:
Cash and due from banks and money market investments	740,293		586,203
Investment securities available for sale	1,803,688		1,942,568
Held To Maturity Securities	144,672		144,815
Equity securities	44,227		44,530
Loans held for sale	33,630		43,186
Total gross loans held for investment portfolio	9,113,955		8,858,123
Less: allowance for loan and lease losses	(172,011)		(196,362)
Loans held for investment, net	8,941,944		8,661,761
Asset Derivative	410		1,018
Liabilities:
Deposits	9,182,181		8,994,714
Securities sold under agreements to repurchase	100,000		150,086
Advances from FHLB	740,000		740,000
Other borrowings	184,150		184,150
Liability Derivatives	481		1,000
Estimate Of Fair Value Fair Value Disclosure [Member]
Assets:
Cash and due from banks and money market investments	740,293		586,203
Investment securities available for sale	1,803,688		1,942,568
Held To Maturity Securities	123,114		125,658
Equity securities	44,227		44,530
Loans held for sale	34,399		43,831
Loans held for investment, net	8,654,929		8,213,144
Asset Derivative	410		1,018
Liabilities:
Deposits	9,192,863		9,005,679
Securities sold under agreements to repurchase	123,244		169,366
Advances from FHLB	742,319		730,253
Other borrowings	184,453		177,201
Liability Derivatives	481		1,000
Estimate Of Fair Value Fair Value Disclosure [Member] | Fair Value Inputs Level 1 [Member]
Assets:
Cash and due from banks and money market investments	740,293		586,203
Investment securities available for sale	7,464		7,456
Held To Maturity Securities	0		0
Equity securities	434		418
Loans held for sale	0		0
Loans held for investment, net	0		0
Asset Derivative	0		0
Liabilities:
Deposits	0		0
Securities sold under agreements to repurchase	0		0
Advances from FHLB	0		0
Other borrowings	0		0
Liability Derivatives	0		0
Estimate Of Fair Value Fair Value Disclosure [Member] | Fair Value Inputs Level 2 [Member]
Assets:
Cash and due from banks and money market investments	0		0
Investment securities available for sale	1,780,318		1,917,874
Held To Maturity Securities	0		0
Equity securities	43,793		44,112
Loans held for sale	27,255		27,720
Loans held for investment, net	0		0
Asset Derivative	410		1,018
Liabilities:
Deposits	9,192,863		9,005,679
Securities sold under agreements to repurchase	123,244		169,366
Advances from FHLB	742,319		730,253
Other borrowings	0		0
Liability Derivatives	481		1,000
Estimate Of Fair Value Fair Value Disclosure [Member] | Fair Value Inputs Level 3 [Member]
Assets:
Cash and due from banks and money market investments	0		0
Investment securities available for sale	15,906		17,238
Held To Maturity Securities	123,114		125,658
Equity securities	0		0
Loans held for sale	7,144		16,111
Loans held for investment, net	8,654,929		8,213,144
Asset Derivative	0		0
Liabilities:
Deposits	0		0
Securities sold under agreements to repurchase	0		0
Advances from FHLB	0		0
Other borrowings	184,453		177,201
Liability Derivatives	$ 0		$ 0

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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