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Disclosures About Fair Value of Financial Instruments - Estimated Fair Values of Financial Instruments (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Jun. 30, 2016
Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents, Carrying Amount $ 401,690 $ 244,709 $ 282,797 $ 264,593
Cash and cash equivalents, Estimated Fair Value 401,690 244,709    
Investment securities, available for sale, Carrying Amount 1,012,605 493,474    
Investment securities, Estimated Fair Value 1,012,605 493,474    
Loans held for sale, Carrying Amount 2,255,096 2,117,510    
Loans held for sale, Estimated Fair Value 2,255,276 2,117,510    
Loans receivable, net of allowance for loan losses, Carrying Amount 6,684,820 6,105,075    
Loans receivable, net of allowance for loan losses, Estimated Fair Value 6,715,271 6,149,773    
FHLB, Federal Reserve Bank and other restricted stock, Carrying Amount 129,689 68,408    
FHLB, Federal Reserve Bank and other restricted stock, Estimated Fair Value 129,689 68,408    
Derivative assets 10,754 10,864    
Assets held for sale, Carrying Amount 13,482 32,248    
Assets held for sale, Estimated Fair Value 13,482 32,248    
Deposits, Carrying Amount 7,021,922 6,846,980    
Deposits, Estimated Fair Value 7,020,634 6,846,868    
Deposits held for sale, Carrying Amount 453,441 456,795    
Deposits held for sale, Estimated Fair Value 453,441 456,795    
Federal funds purchased, Carrying Amount 150,000 83,000    
Federal funds purchased, Estimated Fair Value 150,000 83,000    
FHLB advances, Carrying Amount 1,999,600 868,800    
FHLB advances, Estimated Fair Value 1,999,358 869,049    
Other borrowings, Carrying Amount 186,030 87,123    
Other borrowings, Estimated Fair Value 191,887 91,761    
Subordinated debt, Carrying Amount 108,831 108,783    
Subordinated debt, Estimated Fair Value 114,400 111,375    
Derivative liabilities 13,116 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 401,690 244,709    
Investment securities, Estimated Fair Value 10,661 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    
Assets held for sale, Estimated Fair Value 11,552 20,000    
Deposits, Estimated Fair Value 4,579,560 4,015,218    
Deposits held for sale, Estimated Fair Value 453,441 456,795    
Federal funds purchased, Estimated Fair Value 150,000 83,000    
FHLB advances, Estimated Fair Value 1,189,600 688,800    
Other borrowings, Estimated Fair Value 66,362 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 1,001,944 478,228    
Loans held for sale, Estimated Fair Value 2,104,338 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 129,689 68,408    
Derivative assets 10,652 10,819    
Assets held for sale, Estimated Fair Value 0 0    
Deposits, Estimated Fair Value 2,441,074 2,831,650    
Deposits held for sale, Estimated Fair Value 0 0    
Federal funds purchased, Estimated Fair Value 0 0    
FHLB advances, Estimated Fair Value 809,758 180,249    
Other borrowings, Estimated Fair Value 125,525 25,500    
Subordinated debt, Estimated Fair Value 114,400 111,375    
Derivative liabilities 13,116 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 150,938 0    
Loans receivable, net of allowance for loan losses, Estimated Fair Value 6,715,271 6,149,773    
FHLB, Federal Reserve Bank and other restricted stock, Estimated Fair Value 0 0    
Derivative assets 102 45    
Assets held for sale, Estimated Fair Value 1,930 12,248    
Deposits, Estimated Fair Value 0 0    
Deposits held for sale, 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