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FAIR VALUE (Carrying Amounts and Fair Values of Company's Financial Instruments) (Detail) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Financial Liabilities    
Securities sold under retail repurchase agreements and federal funds purchased $ 988,605 $ 213,605
Advances from FHLB 451,844 513,777
Subordinated debentures 230,301 209,406
Carying amount [member]    
Financial Assets    
Other equity securities 68,853 51,803
Loans, net of allowance 10,179,562 6,649,100
Other assets 125,477 113,171
Financial Liabilities    
Time Deposits 2,166,695 1,542,322
Securities sold under retail repurchase agreements and federal funds purchased 988,605 213,605
Advances from FHLB 451,844 513,777
Subordinated debentures 230,301 209,406
Estimated fair value [member]    
Financial Assets    
Other equity securities 68,853 51,803
Loans, net of allowance 10,327,479 6,628,054
Other assets 125,477 113,171
Financial Liabilities    
Time Deposits 2,194,176 1,547,116
Securities sold under retail repurchase agreements and federal funds purchased 988,722 213,605
Advances from FHLB 467,759 520,729
Subordinated debentures 231,114 200,864
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 0
Significant Other Observable Inputs (Level 2)    
Financial Assets    
Other equity securities 68,853 51,803
Loans, net of allowance 0 0
Other assets 125,477 113,171
Financial Liabilities    
Time Deposits 2,194,176 1,547,116
Securities sold under retail repurchase agreements and federal funds purchased 988,722 213,605
Advances from FHLB 467,759 520,729
Subordinated debentures 0 0
Significant Unobservable Inputs (Level 3)    
Financial Assets    
Other equity securities 0 0
Loans, net of allowance 10,327,479 6,628,054
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 $ 231,114 $ 200,864