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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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