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Disclosures About Fair Value of Financial Instruments - Estimated Fair Values of Financial Instruments (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents, Carrying Amount $ 219,480 $ 264,709 $ 265,588 $ 264,593
Cash and cash equivalents, Estimated Fair Value 219,480 264,709    
Investment securities, available for sale, Carrying Amount 584,823 493,474    
Investment securities, Estimated Fair Value 584,823 493,474    
Loans held for sale, Carrying Amount 2,113,293 2,117,510    
Loans held for sale, Estimated Fair Value 2,113,473 2,117,510    
Loans receivable, net of allowance for loan losses, Carrying Amount 7,023,024 6,117,322    
Loans receivable, net of allowance for loan losses, Estimated Fair Value 7,020,487 6,162,020    
FHLB, Federal Reserve Bank and other restricted stock, Carrying Amount 98,611 68,408    
FHLB, Federal Reserve Bank and other restricted stock, Estimated Fair Value 98,611 68,408    
Derivative assets 10,447 10,864    
Deposits, Carrying Amount 7,597,076 7,303,775    
Deposits, Estimated Fair Value 7,596,324 7,303,663    
Federal funds purchased, Carrying Amount 147,000 83,000    
Federal funds purchased, Estimated Fair Value 147,000 83,000    
FHLB advances, Carrying Amount 1,462,343 868,800    
FHLB advances, Estimated Fair Value 1,462,245 869,049    
Other borrowings, Carrying Amount 186,258 87,123    
Other borrowings, Estimated Fair Value 194,157 91,761    
Subordinated debt, Carrying Amount 108,856 108,783    
Subordinated debt, Estimated Fair Value 115,500 111,375    
Derivative liabilities 12,092 14,172    
Quoted Prices in Active Markets for Identical Assets (Level 1)        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents, Estimated Fair Value 219,480 264,709    
Investment securities, Estimated Fair Value 2,311 15,246    
Loans held for sale, Estimated Fair Value 0 0    
Loans receivable, net of allowance for loan losses, Estimated Fair Value 0 0    
FHLB, Federal Reserve Bank and other restricted stock, Estimated Fair Value 0 0    
Derivative assets 0 0    
Deposits, Estimated Fair Value 5,296,636 4,472,013    
Federal funds purchased, Estimated Fair Value 147,000 83,000    
FHLB advances, Estimated Fair Value 727,343 688,800    
Other borrowings, Estimated Fair Value 65,704 66,261    
Subordinated debt, Estimated Fair Value 0 0    
Derivative liabilities 0 0    
Significant Other Observable Inputs (Level 2)        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents, Estimated Fair Value 0 0    
Investment securities, Estimated Fair Value 582,512 478,228    
Loans held for sale, Estimated Fair Value 1,963,076 2,117,510    
Loans receivable, net of allowance for loan losses, Estimated Fair Value 0 0    
FHLB, Federal Reserve Bank and other restricted stock, Estimated Fair Value 98,611 68,408    
Derivative assets 10,344 10,819    
Deposits, Estimated Fair Value 2,299,688 2,831,650    
Federal funds purchased, Estimated Fair Value 0 0    
FHLB advances, Estimated Fair Value 734,902 180,249    
Other borrowings, Estimated Fair Value 128,453 25,500    
Subordinated debt, Estimated Fair Value 115,500 111,375    
Derivative liabilities 12,092 14,172    
Significant Unobservable Inputs (Level 3)        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents, Estimated Fair Value 0 0    
Investment securities, Estimated Fair Value 0 0    
Loans held for sale, Estimated Fair Value 150,397 0    
Loans receivable, net of allowance for loan losses, Estimated Fair Value 7,020,487 6,162,020    
FHLB, Federal Reserve Bank and other restricted stock, Estimated Fair Value 0 0    
Derivative assets 103 45    
Deposits, Estimated Fair Value 0 0    
Federal funds purchased, Estimated Fair Value 0 0    
FHLB advances, Estimated Fair Value 0 0    
Other borrowings, Estimated Fair Value 0 0    
Subordinated debt, Estimated Fair Value 0 0    
Derivative liabilities $ 0 $ 0