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FAIR VALUE (Carrying Amounts and Fair Values of Company's Financial Instruments) (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Financial Liabilities    
Securities sold under retail repurchase agreements and federal funds purchased $ 127,312 $ 125,119
Advances from FHLB 670,000 790,000
Subordinated debentures 0 30,000
Reported Value Measurement [Member]    
Financial Assets    
Investments held-to-maturity and other equity securities 41,413 46,094
Loans, net of allowance 4,088,092 3,883,741
Other assets 94,526 93,328
Financial Liabilities    
Time Deposits 656,265 586,039
Securities sold under retail repurchase agreements and federal funds purchased 127,312 125,119
Advances from FHLB 670,000 790,000
Subordinated debentures   30,000
Estimate of Fair Value Measurement [Member]    
Financial Assets    
Investments held-to-maturity and other equity securities 41,413 46,094
Loans, net of allowance 4,139,371 3,933,700
Other assets 94,526 93,328
Financial Liabilities    
Time Deposits 654,677 584,868
Securities sold under retail repurchase agreements and federal funds purchased 127,312 125,119
Advances from FHLB 677,244 800,756
Subordinated debentures   29,985
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Financial Assets    
Investments held-to-maturity and 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    
Investments held-to-maturity and other equity securities 41,413 46,094
Loans, net of allowance 0 0
Other assets 94,526 93,328
Financial Liabilities    
Time Deposits 654,677 584,868
Securities sold under retail repurchase agreements and federal funds purchased 127,312 125,119
Advances from FHLB 677,244 800,756
Subordinated debentures   0
Significant Unobservable Inputs (Level 3)    
Financial Assets    
Investments held-to-maturity and other equity securities 0 0
Loans, net of allowance 4,139,371 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