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FAIR VALUE - Fair Value (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016
Assets:
Investment securities available for sale	$ 2,011,221		$ 1,891,016
Held To Maturity Securities	144,799		150,627
Total gross loans held for investment portfolio	8,716,953		8,850,476	$ 8,877,214
Less: allowance for loan and lease losses	(200,563)	$ (222,035)	(231,843)	$ (230,870)	$ (173,485)	$ (205,603)
Loans held for investment, net	8,516,390		8,618,633
Liabilities:
Other borrowings	184,150		208,635
Carrying Reported Amount Fair Value Disclosure [Member]
Assets:
Cash and due from banks and money market investments	656,772		716,395
Investment securities available for sale	2,011,221		1,891,016
Held To Maturity Securities	144,799		150,627
Equity Securities	42,274
Other investment securities	0		43,119
Loans held for sale	65,739		32,980
Total gross loans held for investment portfolio	8,716,953		8,850,476
Less: allowance for loan and lease losses	(200,563)		(231,843)
Loans held for investment, net	8,516,390		8,618,633
Asset Derivative	931		312
Liabilities:
Deposits	9,148,243		9,022,631
Securities sold under agreements to repurchase	100,000		300,000
Advances from FHLB	690,000		715,000
Other borrowings	184,150		208,635
Liability Derivatives	835		324
Estimate Of Fair Value Fair Value Disclosure [Member]
Assets:
Cash and due from banks and money market investments	656,772		716,395
Investment securities available for sale	2,011,221		1,891,016
Held To Maturity Securities	131,703		131,032
Equity Securities	42,274
Other investment securities	0		43,119
Loans held for sale	65,907		34,979
Loans held for investment, net	8,174,205		8,372,865
Asset Derivative	931		312
Liabilities:
Deposits	9,151,666		9,026,600
Securities sold under agreements to repurchase	121,047		325,913
Advances from FHLB	673,788		707,272
Other borrowings	175,480		189,424
Liability Derivatives	835		324
Estimate Of Fair Value Fair Value Disclosure [Member] | Fair Value Inputs Level 1 [Member]
Assets:
Cash and due from banks and money market investments	656,772		716,395
Investment securities available for sale	7,426		7,819
Held To Maturity Securities	0		0
Equity Securities	411
Other investment securities	0		0
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	1,985,926		1,863,342
Held To Maturity Securities	0		0
Equity Securities	41,863
Other investment securities	0		43,119
Loans held for sale	21,730		25,237
Loans held for investment, net	0		0
Asset Derivative	931		312
Liabilities:
Deposits	9,151,666		9,026,600
Securities sold under agreements to repurchase	121,047		325,913
Advances from FHLB	673,788		707,272
Other borrowings	0		0
Liability Derivatives	835		324
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	17,869		19,855
Held To Maturity Securities	131,703		131,032
Equity Securities	0
Other investment securities	0		0
Loans held for sale	44,177		9,742
Loans held for investment, net	8,174,205		8,372,865
Asset Derivative	0		0
Liabilities:
Deposits	0		0
Securities sold under agreements to repurchase	0		0
Advances from FHLB	0		0
Other borrowings	175,480		189,424
Liability Derivatives	$ 0		$ 0

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Fair value of investment other than investment in equity security, investment in debt security and equity method investment. Includes, but is not limited to, investment in certain entities that calculate net asset value per share. Example includes, but is not limited to, investment in hedge fund, venture capital fund, private equity fund, and real estate partnership or fund.

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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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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