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Summary of Significant Accounting Policies Schedule of Impact of Adoption of New Accounting Standard (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Jan. 01, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Financing receivable, allowance for credit loss |  | $ 43,288 |
Allowance for credit losses on held-to-maturity debt securities | $ (645) | 0 |
Deferred tax asset |  | 14,851 |
Retained earnings | $ 380,667 | 380,737 | $ 380,737
Loans Receivable |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Financing receivable, allowance for credit loss |  | 5,314,337 |
Unfunded Loan Commitment |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Reserve for unfunded commitments |  | 430 |
Cumulative Effect, Period Of Adoption, Adjustment |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Financing receivable, allowance for credit loss |  | 28,387 |
Allowance for credit losses on held-to-maturity debt securities |  | 303 |
Deferred tax asset |  | 5,898 |
Retained earnings |  | (18,114) |
Cumulative Effect, Period Of Adoption, Adjustment | Loans Receivable |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Financing receivable, allowance for credit loss |  | 7,091 |
Cumulative Effect, Period Of Adoption, Adjustment | Unfunded Loan Commitment |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Reserve for unfunded commitments |  | 2,413 |
Cumulative Effect, Period Of Adoption, Adjusted Balance |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Financing receivable, allowance for credit loss |  | 71,675 |
Allowance for credit losses on held-to-maturity debt securities |  | 303 |
Deferred tax asset |  | 20,749 |
Retained earnings |  | 362,623 |
Cumulative Effect, Period Of Adoption, Adjusted Balance | Loans Receivable |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Financing receivable, allowance for credit loss |  | 5,321,428 |
Cumulative Effect, Period Of Adoption, Adjusted Balance | Unfunded Loan Commitment |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Reserve for unfunded commitments |  | 2,843 |
Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Retained earnings |  | $ 18,100 |

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