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FAIR VALUE (Carrying Amounts and Fair Values of Company's Financial Instruments) (Detail) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Financial Liabilities    
Securities sold under retail repurchase agreements and federal funds purchased $ 125,305 $ 213,605
Advances from FHLB 754,061 513,777
Subordinated debentures 199,046 209,406
Carying amount [member]    
Financial Assets    
Other equity securities 62,953 51,803
Loans, net of allowance 6,637,192 6,649,100
Other assets 113,817 113,171
Financial Liabilities    
Time Deposits 1,646,611 1,542,322
Securities sold under retail repurchase agreements and federal funds purchased 125,305 213,605
Advances from FHLB 754,061 513,777
Subordinated debentures 199,046 209,406
Estimated fair value [member]    
Financial Assets    
Other equity securities 62,953 51,803
Loans, net of allowance 6,721,435 6,628,054
Other assets 113,817 113,171
Financial Liabilities    
Time Deposits 1,663,576 1,547,116
Securities sold under retail repurchase agreements and federal funds purchased 125,305 213,605
Advances from FHLB 770,511 520,729
Subordinated debentures 183,857 200,864
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 62,953 51,803
Loans, net of allowance 0 0
Other assets 113,817 113,171
Financial Liabilities    
Time Deposits 1,663,576 1,547,116
Securities sold under retail repurchase agreements and federal funds purchased 125,305 213,605
Advances from FHLB 770,511 520,729
Subordinated debentures 0 0
Significant Unobservable Inputs (Level 3)    
Financial Assets    
Other equity securities 0 0
Loans, net of allowance 6,721,435 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 $ 183,857 $ 200,864