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Summary of Significant Accounting Policies (Details) | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2021 USD ($) plan shares | Jan. 01, 2021 USD ($) | Dec. 31, 2020 USD ($) shares | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Number of compensation plans | plan | 3 |  |  |  |
Award vesting period (in years) | 4 years |  |  |  |
ESPP, market price discount percentage | 5.00% |  |  |  |
Outstanding balance on ESOP loan | $ 0 |  | $ 0 |  |
Unallocated shares (in shares) | shares | 0 |  | 0 |  |
Cumulative effect of adoption | $ 371,186,000 |  | $ 334,392,000 | $ 301,728,000 | $ 269,584,000
Financing receivable, allowance for credit loss, excluding accrued interest | 27,281,000 |  | 29,232,000 | 21,187,000 | 20,196,000
Off-balance sheet, credit loss, liability | 1,800,000 |  |  |  |
Deferred tax liabilities, net | 3,359,000 |  | 1,558,000 |  |
Retained Earnings |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Cumulative effect of adoption | $ 54,078,000 |  | 41,899,000 | $ 33,218,000 | $ 29,257,000
Accounting Standards Update 2016-13 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Financing receivable, allowance for credit loss, excluding accrued interest |  | $ (1,300,000) |  |  |
Off-balance sheet, credit loss, liability |  | 1,100,000 |  |  |
Deferred tax liabilities, net |  | 41,000 |  |  |
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Cumulative effect of adoption |  |  | 120,000 |  |
Financing receivable, allowance for credit loss, excluding accrued interest |  |  | (1,300,000) |  |
Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Cumulative effect of adoption |  |  | $ 120,000 |  |
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13 | Retained Earnings |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Cumulative effect of adoption |  | $ 120,000 |  |  |
Option |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Award vesting period (in years) | 4 years |  |  |  |
Restricted Stock Units (RSUs) |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Award vesting period (in years) | 3 years |  |  |  |
Building and Building Improvements | Minimum |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Property, plant and equipment, useful life | 20 years |  |  |  |
Building and Building Improvements | Maximum |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Property, plant and equipment, useful life | 40 years |  |  |  |
Furniture and Fixtures | Minimum |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Property, plant and equipment, useful life | 7 years |  |  |  |
Furniture and Fixtures | Maximum |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Property, plant and equipment, useful life | 10 years |  |  |  |
Computer Equipment | Minimum |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Property, plant and equipment, useful life | 5 years |  |  |  |
Computer Equipment | Maximum |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Property, plant and equipment, useful life | 7 years |  |  |  |

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