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INVESTMENT SECURITIES - Aggregate amortized cost and approximate market value of investment securities available for sale (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]
Within 1 year, Amortized cost	$ 122,571
After 1 to 5 years, Amortized cost	343,760
After 5 to 10 years, Amortized cost	278,331
After 10 years, Amortized cost	1,158,792
Available For Sale Debt Securities Amortized Cost Basis	1,903,454
Equity securities, Amortized cost	424
Total investment securities available for sale, Amortized cost	1,903,878	$ 1,908,557
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Within 1 year, Fair Value	122,252
After 1 to 5 years, Fair Value	340,196
After 5 to 10 years, Fair Value	278,564
After 10 years, Fair Value	1,149,586
Total, Fair Value	1,890,598
Equity Securities, Fair Value	418
Total investment securities available for sale	$ 1,891,016	$ 1,881,920

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