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Organization, Basis of Presentation and Recently Adopted Accounting Standards - Schedule Of New Accounting Pronouncements And Changes In Accounting Principles (Detail) - USD ($) $ in Thousands | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2019 | Dec. 31, 2018
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |  |
Allowance for loan and lease losses | $ 162,244 | $ 147,638 | $ 156,636 | $ 159,820
Other loans [Member] |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |  |
Allowance for loan and lease losses | 20,930 | $ 24,943 | $ 27,870 | $ 28,837
Previously Reported |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss, Not Previously Recorded | 0 |  |  |
Allowance for loan and lease losses | 147,638 |  |  |
Off-Balance Sheet, Credit Loss, Liability | 461 |  |  |
Previously Reported | Multi Family |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |  |
Allowance for loan and lease losses | 96,751 |  |  |
Previously Reported | Commercial Real Estate |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |  |
Allowance for loan and lease losses | 20,744 |  |  |
Previously Reported | One to Four Family Mortgage Loans |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |  |
Allowance for loan and lease losses | 1,051 |  |  |
Previously Reported | Acquisition, Development, and Construction Mortgage Loans |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |  |
Allowance for loan and lease losses | 4,148 |  |  |
Previously Reported | Commercial and Industrial |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |  |
Allowance for loan and lease losses | 24,819 |  |  |
Previously Reported | Other loans [Member] |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |  |
Allowance for loan and lease losses | 125 |  |  |
Previously Reported | Collateralized Mortgage Backed Securities |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss, Not Previously Recorded | 0 |  |  |
Previously Reported | Debt Securities [Member] |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss, Not Previously Recorded | 0 |  |  |
Accounting Standards Update 2016-13 [Member] |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss, Not Previously Recorded | 0 |  |  |
Allowance for loan and lease losses | 149,549 |  |  |
Off-Balance Sheet, Credit Loss, Liability | 12,990 |  |  |
Accounting Standards Update 2016-13 [Member] | Multi Family |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |  |
Allowance for loan and lease losses | 104,918 |  |  |
Accounting Standards Update 2016-13 [Member] | Commercial Real Estate |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |  |
Allowance for loan and lease losses | 12,543 |  |  |
Accounting Standards Update 2016-13 [Member] | One to Four Family Mortgage Loans |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |  |
Allowance for loan and lease losses | 1,655 |  |  |
Accounting Standards Update 2016-13 [Member] | Acquisition, Development, and Construction Mortgage Loans |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |  |
Allowance for loan and lease losses | 3,678 |  |  |
Accounting Standards Update 2016-13 [Member] | Commercial and Industrial |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |  |
Allowance for loan and lease losses | 26,613 |  |  |
Accounting Standards Update 2016-13 [Member] | Other loans [Member] |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |  |
Allowance for loan and lease losses | 142 |  |  |
Accounting Standards Update 2016-13 [Member] | Collateralized Mortgage Backed Securities |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss, Not Previously Recorded | 0 |  |  |
Accounting Standards Update 2016-13 [Member] | Debt Securities [Member] |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss, Not Previously Recorded | 0 |  |  |
Accounting Standards Update 2016-13 [Member] | Restatement Adjustment |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss, Not Previously Recorded | 0 |  |  |
Allowance for loan and lease losses | 1,911 |  |  |
Off-Balance Sheet, Credit Loss, Liability | 12,529 |  |  |
Decrease in retained earnings, before tax | 14,440 |  |  |
Accounting Standards Update 2016-13 [Member] | Restatement Adjustment | Multi Family |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |  |
Allowance for loan and lease losses | 8,167 |  |  |
Accounting Standards Update 2016-13 [Member] | Restatement Adjustment | Commercial Real Estate |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |  |
Allowance for loan and lease losses | (8,201) |  |  |
Accounting Standards Update 2016-13 [Member] | Restatement Adjustment | One to Four Family Mortgage Loans |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |  |
Allowance for loan and lease losses | 604 |  |  |
Accounting Standards Update 2016-13 [Member] | Restatement Adjustment | Acquisition, Development, and Construction Mortgage Loans |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |  |
Allowance for loan and lease losses | (470) |  |  |
Accounting Standards Update 2016-13 [Member] | Restatement Adjustment | Commercial and Industrial |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |  |
Allowance for loan and lease losses | 1,794 |  |  |
Accounting Standards Update 2016-13 [Member] | Restatement Adjustment | Other loans [Member] |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |  |
Allowance for loan and lease losses | 17 |  |  |
Accounting Standards Update 2016-13 [Member] | Restatement Adjustment | Collateralized Mortgage Backed Securities |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss, Not Previously Recorded | 0 |  |  |
Accounting Standards Update 2016-13 [Member] | Restatement Adjustment | Debt Securities [Member] |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss, Not Previously Recorded | $ 0 |  |  |

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