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Fair Value (Carrying Amounts and Fair Values of Company's Financial Instruments) (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Financial Liabilities    
Securities sold under retail repurchase agreements and federal funds purchased $ 121,378 $ 74,432
Advances from FHLB 610,000 655,000
Subordinated debentures 35,000 35,000
Reported Value Measurement [Member]    
Financial Assets    
Investments held-to-maturity and other equity securities 254,790 261,410
Loans, net of allowance 3,372,778 3,089,590
Other assets 90,232 88,657
Financial Liabilities    
Time Deposits 510,351 444,921
Securities sold under retail repurchase agreements and federal funds purchased 121,378 74,432
Advances from FHLB 610,000 655,000
Subordinated debentures 35,000 35,000
Estimate of Fair Value Measurement [Member]    
Financial Assets    
Investments held-to-maturity and other equity securities 258,371 263,697
Loans, net of allowance 3,402,884 3,118,635
Other assets 90,232 88,657
Financial Liabilities    
Time Deposits 510,046 444,729
Securities sold under retail repurchase agreements and federal funds purchased 121,378 74,432
Advances from FHLB 635,257 679,163
Subordinated debentures 13,430 13,276
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 0
Significant Other Observable Inputs (Level 2)    
Financial Assets    
Investments held-to-maturity and other equity securities 258,371 263,697
Loans, net of allowance 0 0
Other assets 90,232 88,657
Financial Liabilities    
Time Deposits 510,046 444,729
Securities sold under retail repurchase agreements and federal funds purchased 121,378 74,432
Advances from FHLB 635,257 679,163
Subordinated debentures 0 0
Significant Unobservable Inputs (Level 3)    
Financial Assets    
Investments held-to-maturity and other equity securities 0 0
Loans, net of allowance 3,402,884 3,118,635
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 $ 13,430 $ 13,276