FINANCIAL INSTRUMENTS WITH OFF-BALANCE SHEET RISK AND DERIVATIVES (Summary Of Financial Instruments With Off-Balance Sheet Credit Risk) (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Disclosure Summary Of Financial Instruments With Off Balance Sheet Credit Risk [Line Items]
Total Commitments to extend credit and available credit lines	$ 1,473,733	$ 1,284,200
Commercial
Disclosure Summary Of Financial Instruments With Off Balance Sheet Credit Risk [Line Items]
Total Commitments to extend credit and available credit lines	334,552	234,552
Real estate-development and construction
Disclosure Summary Of Financial Instruments With Off Balance Sheet Credit Risk [Line Items]
Total Commitments to extend credit and available credit lines	97,524	80,935
Real estate-residential mortgage
Disclosure Summary Of Financial Instruments With Off Balance Sheet Credit Risk [Line Items]
Total Commitments to extend credit and available credit lines	22,970	23,375
Lines of credit, principally home equity and business lines
Disclosure Summary Of Financial Instruments With Off Balance Sheet Credit Risk [Line Items]
Total Commitments to extend credit and available credit lines	949,939	879,326
Standby letters of credit
Disclosure Summary Of Financial Instruments With Off Balance Sheet Credit Risk [Line Items]
Total Commitments to extend credit and available credit lines	$ 68,748	$ 66,012