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Loans - Additional Information (Detail)
 3 Months Ended 12 Months Ended
Mar. 31, 2017
USD ($)
Investment
Mar. 31, 2016
USD ($)
Investment
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Financing Receivable, Recorded Investment [Line Items]        
Outstanding loans to Executive officers, directors, principal shareholders, related interest and parties $ 91,300,000   $ 91,300,000 $ 91,800,000
Non-Covered Loans 37,304,853,000   37,304,853,000 37,356,201,000
Delinquent loans selectively extended to certain borrowers, rate reductions, forbearance of arrears, and extension of maturity dates $ 5,084,000 $ 11,594,000    
Number of loans modified as TDRs | Investment 18 5    
Covered loans $ 1,599,101,000   1,599,101,000 1,698,133,000
Provision for (recovery of) losses (4,008,000) $ (176,000)    
FDIC indemnification expense 4,600,000 2,300,000    
Am Trust Bank and Desert Hills Bank        
Financing Receivable, Recorded Investment [Line Items]        
Total loans, net 2,000,000,000   2,000,000,000 2,100,000,000
Purchased Credit-Impaired Loans        
Financing Receivable, Recorded Investment [Line Items]        
Non-Covered Loans 5,840,000   5,840,000 5,762,000
Purchased credit-impaired loans outstanding 6,800,000   6,800,000  
One-to-four family        
Financing Receivable, Recorded Investment [Line Items]        
Non-Covered Loans 416,983,000   416,983,000 381,081,000
Delinquent loans selectively extended to certain borrowers, rate reductions, forbearance of arrears, and extension of maturity dates $ 339,000 $ 533,000    
Number of loans modified as TDRs | Investment 1 2    
Covered loans $ 1,531,872,000   1,531,872,000  
Principal shareholders        
Financing Receivable, Recorded Investment [Line Items]        
Outstanding loans to Executive officers, directors, principal shareholders, related interest and parties 0   0 0
Financing Receivable Troubled Debt Restructurings Rate Reductions        
Financing Receivable, Recorded Investment [Line Items]        
Delinquent loans selectively extended to certain borrowers, rate reductions, forbearance of arrears, and extension of maturity dates     21,000,000  
Financing Receivable Troubled Debt Restructurings Forbearance of Arrears        
Financing Receivable, Recorded Investment [Line Items]        
Delinquent loans selectively extended to certain borrowers, rate reductions, forbearance of arrears, and extension of maturity dates     2,800,000  
Residential Mortgage        
Financing Receivable, Recorded Investment [Line Items]        
Mortgage loans on real estate, foreclosures 71,400,000     78,600,000
Covered Loans        
Financing Receivable, Recorded Investment [Line Items]        
Current 1,400,000,000   1,400,000,000  
Provision for (recovery of) losses (5,795,000) $ (2,897,000)    
Covered Loans | Loans 90 Days Or More Past Due        
Financing Receivable, Recorded Investment [Line Items]        
Total Past Due 127,467,000   127,467,000 131,465,000
Covered Loans | Loans 90 Days Or More Past Due | One-to-four family        
Financing Receivable, Recorded Investment [Line Items]        
Total Past Due 120,841,000   120,841,000 124,820,000
Covered Loans | Performing Financial Instruments | Financing Receivable Recorded Investment 30 to 89 days past due        
Financing Receivable, Recorded Investment [Line Items]        
Total Past Due 24,600,000   24,600,000  
Covered Loans | Performing Financial Instruments | Loans 90 Days Or More Past Due        
Financing Receivable, Recorded Investment [Line Items]        
Total Past Due 127,500,000   127,500,000  
Non-Covered Loans        
Financing Receivable, Recorded Investment [Line Items]        
Total Past Due 76,611,000   76,611,000 66,852,000
Current 37,222,402,000   37,222,402,000 37,283,587,000
Provision for (recovery of) losses $ 1,787,000 $ 2,721,000    
Non-Covered Loans | One-to-four family        
Financing Receivable, Recorded Investment [Line Items]        
Number of loans modified as TDRs | Investment 1      
Loan modified as TDRs subsequently defaulted $ 103,000      
Total Past Due 10,885,000   10,885,000 12,523,000
Current 406,098,000   406,098,000 368,558,000
Non-Covered Loans | Home Equity Loans        
Financing Receivable, Recorded Investment [Line Items]        
Number of loans modified as TDRs | Investment   1    
Loan modified as TDRs subsequently defaulted   $ 142,000    
Non-Covered Loans | Loans 90 Days Or More Past Due | Purchased Credit-Impaired Loans        
Financing Receivable, Recorded Investment [Line Items]        
Total Past Due $ 863,000   $ 863,000 $ 869,000