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SECURITIES (Narrative) (Detail)
 3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
security
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Jun. 30, 2017
USD ($)
security
Jun. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
security
Schedule of Investments [Line Items]            
Net unrealized gains (losses) on available-for-sale securities, net of tax $ (4,365,000)     $ (4,365,000)   $ (6,085,000)
Deferred tax assets, unrealized losses on available for sale securities $ 2,300,000     2,300,000   $ 3,300,000
Payments to acquire investments       $ 97,300,000 $ 108,400,000  
AFS securities in unrealized loss positions, number of positions | security 187     187   209
AFS and HTM securities in Continues Unrealized Loss Position $ 623,200,000     $ 623,200,000   $ 658,500,000
AFS and HTM Securities Unrealized Loss Accumulated in Investments 10,600,000     10,600,000   13,200,000
Fair Value - 12 Months of More 121,640,000     121,640,000   $ 103,708,000
Unrealized Loss as a Percent of Fair Value           2.00%
Proceeds from Sale of Available-for-sale Securities 0 $ 84,000   0 84,000  
Net gain on sale of securities 0 4,000   0 4,000  
Investment securities sold, carrying amount   $ 80,000 $ 0      
Federal Home Loan Bank Stock 21,800,000     21,800,000   $ 17,800,000
Federal Reserve Bank Stock 5,400,000     5,400,000   5,400,000
Security pledged as collateral, amortized cost 606,800,000     606,800,000   597,300,000
Security pledged as collateral, fair value 600,500,000     600,500,000   589,700,000
Residential Mortgage Backed Securities [Member]            
Schedule of Investments [Line Items]            
Fair Value - 12 Months of More 121,600,000     121,600,000    
Collateralized Mortgage Backed Securities [Member]            
Schedule of Investments [Line Items]            
Fair Value - 12 Months of More 103,700,000     103,700,000    
Mortgage Backed Securities and Collateralized Mortgage Obligations [Member]            
Schedule of Investments [Line Items]            
AFS and HTM Securities Unrealized Loss Accumulated in Investments 4,500,000     4,500,000   3,900,000
Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises            
Schedule of Investments [Line Items]            
Fair Value - 12 Months of More 29,988,000     29,988,000   29,496,000
Collateralized Mortgage Obligations [Member]            
Schedule of Investments [Line Items]            
Fair Value - 12 Months of More $ 91,652,000     $ 91,652,000   $ 74,212,000
Available-for-sale Securities            
Schedule of Investments [Line Items]            
Payments to acquire investments         98,700,000  
Held-to-maturity Securities            
Schedule of Investments [Line Items]            
Payments to acquire investments         $ 9,700,000