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Loans - Additional Information (Detail) | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2017 USD ($) Investment | Jun. 30, 2016 USD ($) Investment | Jun. 30, 2017 USD ($) Investment | Jun. 30, 2016 USD ($) Investment | Dec. 31, 2016 USD ($) | Jun. 27, 2017 USD ($)
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |
Outstanding loans to Executive officers, directors, principal shareholders, related interest and parties | $ 58,200,000 |  | $ 58,200,000 |  | $ 91,800,000 |
Non-Covered Loans | 37,225,844,000 |  | 37,225,844,000 |  | 37,356,201,000 |
Loans held for sale | 266,888,000 |  | 266,888,000 |  | 409,152,000 |
Covered loans | 1,500,000,000 |  | 1,500,000,000 |  | 1,698,133,000 |
Delinquent loans selectively extended to certain borrowers, rate reductions, forbearance of arrears, and extension of maturity dates | $ 19,379,000 | $ 758,000 | $ 24,145,000 | $ 10,439,000 |  |
Number of loans modified as TDRs | Investment | 16 | 2 | 34 | 6 |  |
Provision (recovery) for losses on loans | $ (6,261,000) | $ 895,000 | $ (10,269,000) | $ 719,000 |  |
FDIC indemnification expense | 14,300,000 | 1,500,000 | 19,000,000 | 3,800,000 |  |
Freedom Mortgage Corporation |  |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |
Mortgage servicing rights asset |  |  |  |  |  | $ 220,600,000
Loans held for sale |  |  |  |  |  | 266,900,000
Am Trust Bank and Desert Hills Bank |  |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |
Total loans, net | 1,800,000,000 |  | 1,800,000,000 |  | 2,100,000,000 |
Purchased Credit-Impaired Loans |  |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |
Non-Covered Loans | 5,406,000 |  | 5,406,000 |  | 5,762,000 |
Purchased credit-impaired loans outstanding | 6,200,000 |  | 6,200,000 |  |  |
One-to-four family |  |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |
Non-Covered Loans | 412,945,000 |  | 412,945,000 |  | 381,081,000 |
Delinquent loans selectively extended to certain borrowers, rate reductions, forbearance of arrears, and extension of maturity dates | $ 657,000 | $ 108,000 | $ 994,000 | $ 636,000 |  |
Number of loans modified as TDRs | Investment | 3 | 1 | 4 | 3 |  |
One-to-four family | Cerberus Capital Management, L. P. |  |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |
Covered loans |  |  |  |  |  | $ 1,500,000,000
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 |  |  | 37,400,000 |  |  |
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 |  |  | 2,600,000 |  |  |
Residential Mortgage |  |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |
Mortgage loans on real estate, foreclosures |  |  | 71,600,000 |  | 78,600,000 |
Covered Loans |  |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |
Current | 1,300,000,000 |  | 1,300,000,000 |  |  |
Provision (recovery) for losses on loans | (17,906,000) | $ (1,849,000) | (23,701,000) | $ (4,746,000) |  |
Covered Loans | Performing Financial Instruments | Financing Receivable Recorded Investment 30 to 89 days past due |  |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |
Total Past Due | 22,900,000 |  | 22,900,000 |  |  |
Covered Loans | Performing Financial Instruments | Loans 90 Days Or More Past Due |  |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |
Total Past Due | 129,100,000 |  | 129,100,000 |  |  |
Non-Covered Loans |  |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |
Total Past Due | 94,123,000 |  | 94,123,000 |  | 66,852,000 |
Current | 37,126,315,000 |  | 37,126,315,000 |  | 37,283,587,000 |
Provision (recovery) for losses on loans | 11,645,000 | $ 2,744,000 | $ 13,432,000 | $ 5,465,000 |  |
Non-Covered Loans | One-to-four family |  |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |
Number of loans modified as TDRs | Investment |  |  | 1,000,000 |  |  |
Loan modified as TDRs subsequently defaulted |  |  | $ 255,000,000,000 |  |  |
Total Past Due | 11,021,000 |  | 11,021,000 |  | 12,523,000 |
Current | 401,924,000 |  | 401,924,000 |  | 368,558,000 |
Non-Covered Loans | Loans 90 Days Or More Past Due | Purchased Credit-Impaired Loans |  |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |
Total Past Due | $ 595,000 |  | $ 595,000 |  | $ 869,000 |

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