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FAIR VALUE (Carrying Amounts and Fair Values of Company's Financial Instruments) (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Financial Liabilities    
Securities sold under retail repurchase agreements and federal funds purchased $ 146,569 $ 125,119
Advances from FHLB 632,917 790,000
Subordinated debentures 0 30,000
Reported Value Measurement [Member]    
Financial Assets    
Other equity securities 39,853 46,094
Loans, net of allowance 4,149,194 3,883,741
Other assets 95,136 93,328
Financial Liabilities    
Time Deposits 690,208 586,039
Securities sold under retail repurchase agreements and federal funds purchased 146,569 125,119
Advances from FHLB 632,917 790,000
Subordinated debentures   30,000
Estimate of Fair Value Measurement [Member]    
Financial Assets    
Other equity securities 39,853 46,094
Loans, net of allowance 4,200,409 3,933,700
Other assets 95,136 93,328
Financial Liabilities    
Time Deposits 688,271 584,868
Securities sold under retail repurchase agreements and federal funds purchased 146,569 125,119
Advances from FHLB 639,022 800,756
Subordinated debentures   29,985
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Financial Assets    
Other equity securities 0 0
Loans, net of allowance 0 0
Other assets 0 0
Financial Liabilities    
Time Deposits 0 0
Securities sold under retail repurchase agreements and federal funds purchased 0 0
Advances from FHLB 0 0
Subordinated debentures   0
Significant Other Observable Inputs (Level 2)    
Financial Assets    
Other equity securities 39,853 46,094
Loans, net of allowance 0 0
Other assets 95,136 93,328
Financial Liabilities    
Time Deposits 688,271 584,868
Securities sold under retail repurchase agreements and federal funds purchased 146,569 125,119
Advances from FHLB 639,022 800,756
Subordinated debentures   0
Significant Unobservable Inputs (Level 3)    
Financial Assets    
Other equity securities 0 0
Loans, net of allowance 4,200,409 3,933,700
Other assets 0 0
Financial Liabilities    
Time Deposits 0 0
Securities sold under retail repurchase agreements and federal funds purchased 0 0
Advances from FHLB $ 0 0
Subordinated debentures   $ 29,985