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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

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