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Disclosures About Fair Value of Financial Instruments - Estimated Fair Values of Financial Instruments (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents, Carrying Amount $ 215,411 $ 146,323 $ 177,290 $ 264,709
Cash and cash equivalents, Estimated Fair Value 215,411 146,323    
Debt securities, available for sale 1,178,299      
Debt securities, available for sale, Estimated Fair Value 1,178,299      
Investment securities, at fair value 1,181,661 471,371    
Investments securities, available for sale, fair value   471,371    
Equity securities, carrying amount 3,362      
Equity securities, Estimated Fair Value 3,362      
Loans held for sale, Carrying Amount 1,875,515 1,939,485    
Loans held for sale, Estimated Fair Value 1,875,515 1,939,659    
Loans receivable, net of allowance for loan losses, Carrying Amount 6,904,067 6,730,243    
Loans receivable, net of allowance for loan losses, Estimated Fair Value 6,829,770 6,676,763    
FHLB, Federal Reserve Bank and other restricted stock, Carrying Amount 130,302 105,918    
FHLB, Federal Reserve Bank and other restricted stock, Estimated Fair Value 130,302 105,918    
Derivative assets 13,606 9,752    
Deposits, Carrying Amount 7,042,459 6,800,142    
Deposits, Estimated Fair Value 7,034,680 6,796,095    
Federal funds purchased, Carrying Amount 195,000 155,000    
Federal funds purchased, Estimated Fair Value 195,000 155,000    
FHLB advances, Carrying Amount 2,252,615 1,611,860    
FHLB advances, Estimated Fair Value 2,252,445 1,611,603    
Other borrowings, Carrying Amount 186,735 186,497    
Other borrowings, Estimated Fair Value 187,092 193,557    
Subordinated debt, Carrying Amount 108,904 108,880    
Subordinated debt, Estimated Fair Value 114,950 115,775    
Derivative liabilities 12,673 10,074    
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 215,411 146,323    
Debt securities, available for sale, Estimated Fair Value 0      
Investments securities, available for sale, fair value   3,352    
Equity securities, Estimated Fair Value 3,362      
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 5,153,428 4,894,449    
Federal funds purchased, Estimated Fair Value 195,000 155,000    
FHLB advances, Estimated Fair Value 1,687,615 881,860    
Other borrowings, Estimated Fair Value 64,262 65,072    
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    
Debt securities, available for sale, Estimated Fair Value 1,178,299      
Investments securities, available for sale, fair value   468,019    
Equity securities, Estimated Fair Value 0      
Loans held for sale, Estimated Fair Value 1,875,515 1,795,294    
Loans receivable, net of allowance for loan losses, Estimated Fair Value 0 0    
FHLB, Federal Reserve Bank and other restricted stock, Estimated Fair Value 130,302 105,918    
Derivative assets 13,523 9,692    
Deposits, Estimated Fair Value 1,881,252 1,901,646    
Federal funds purchased, Estimated Fair Value 0 0    
FHLB advances, Estimated Fair Value 564,830 729,743    
Other borrowings, Estimated Fair Value 122,830 128,485    
Subordinated debt, Estimated Fair Value 114,950 115,775    
Derivative liabilities 12,673 10,074    
Significant Unobservable Inputs (Level 3)        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents, Estimated Fair Value 0 0    
Debt securities, available for sale, Estimated Fair Value 0      
Investments securities, available for sale, fair value   0    
Equity securities, Estimated Fair Value 0      
Loans held for sale, Estimated Fair Value 0 144,365    
Loans receivable, net of allowance for loan losses, Estimated Fair Value 6,829,770 6,676,763    
FHLB, Federal Reserve Bank and other restricted stock, Estimated Fair Value 0 0    
Derivative assets 83 60    
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