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INVESTMENTS (Narrative) (Detail)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
security
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
security
Jun. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
security
Schedule of Investments [Line Items]          
Net unrealized gains (losses) on available-for-sale securities, net of tax $ (23,197)   $ (23,197)   $ (10,300)
Deferred tax assets, unrealized losses on available for sale securities $ 6,400   6,400   $ 2,800
Payments to acquire investments     $ 100,600 $ 97,300  
AFS securities in unrealized loss positions, number of positions | security 337   337   209
AFS and HTM securities in Continuous Unrealized Loss Position $ 835,200   $ 835,200   $ 741,200
AFS and HTM Securities Unrealized Loss Accumulated in Investments 31,700   31,700   14,500
Fair Value - 12 Months of More $ 390,045   $ 390,045   $ 398,360
Unrealized Loss as a Percent of Fair Value 3.80%   3.80%   2.00%
Investment securities sold, carrying amount $ 9,900        
Gross realized gains 31 $ 0 $ 31 $ 0  
Security pledged as collateral, amortized cost 689,600   689,600   $ 702,500
Security pledged as collateral, fair value 663,800   663,800   691,200
Unrealized loss, change in fair value of bank stock equity securities 11   (24)    
Gain on sale of other investment     195    
Residential Mortgage Backed Securities          
Schedule of Investments [Line Items]          
Fair Value - 12 Months of More 390,000   390,000    
Collateralized Mortgage Backed Securities          
Schedule of Investments [Line Items]          
Fair Value - 12 Months of More 398,400   398,400    
Mortgage Backed Securities and Collateralized Mortgage Obligations          
Schedule of Investments [Line Items]          
AFS and HTM Securities Unrealized Loss Accumulated in Investments 21,000   21,000   11,200
Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises          
Schedule of Investments [Line Items]          
Fair Value - 12 Months of More 240,607   240,607   233,971
Collateralized Mortgage Obligations          
Schedule of Investments [Line Items]          
Fair Value - 12 Months of More $ 149,438   $ 149,438   $ 164,389