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Loans Receivable and Allowance for Credit Losses (TDR Post-Modifications) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Post-Modification Outstanding Recorded Investment | $ 28,229 | $ 58,036 | $ 47,072 | $ 102,181 |
Commitment to lend | 6,800 |  | 6,800 |  | $ 3,000
Principal |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Post-Modification Outstanding Recorded Investment | 28,229 | 41,493 | 29,898 | 58,511 |
Principal and Interest |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Post-Modification Outstanding Recorded Investment | 0 | 0 | 0 | 10,819 |
Interest Deferments |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Post-Modification Outstanding Recorded Investment | 0 | 16,543 | 0 | 32,851 |
Interest Rate Reduction |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Post-Modification Outstanding Recorded Investment | 0 | 0 | 17,174 | 0 |
Commercial lending |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Post-Modification Outstanding Recorded Investment | 28,229 | 58,036 | 47,072 | 102,181 |
Commercial lending | Principal |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Post-Modification Outstanding Recorded Investment | 28,229 | 41,493 | 29,898 | 58,511 |
Commercial lending | Principal and Interest |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Post-Modification Outstanding Recorded Investment | 0 | 0 | 0 | 10,819 |
Commercial lending | Interest Deferments |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Post-Modification Outstanding Recorded Investment | 0 | 16,543 | 0 | 32,851 |
Commercial lending | Interest Rate Reduction |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Post-Modification Outstanding Recorded Investment | 0 | 0 |  |  |
Commercial lending | Commercial and industrial (“C&I”) |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Post-Modification Outstanding Recorded Investment | 27,111 | 35,568 | 45,954 | 79,713 |
Commercial lending | Commercial and industrial (“C&I”) | Principal |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Post-Modification Outstanding Recorded Investment | 27,111 | 19,025 | 28,780 | 36,043 |
Commercial lending | Commercial and industrial (“C&I”) | Principal and Interest |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Post-Modification Outstanding Recorded Investment | 0 | 0 | 0 | 10,819 |
Commercial lending | Commercial and industrial (“C&I”) | Interest Deferments |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Post-Modification Outstanding Recorded Investment | 0 | 16,543 | 0 | 32,851 |
Commercial lending | Commercial and industrial (“C&I”) | Interest Rate Reduction |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Post-Modification Outstanding Recorded Investment | 0 | 0 | 17,174 | 0 |
Commercial lending | Commercial real estate (“CRE”) |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Post-Modification Outstanding Recorded Investment | 0 | 21,242 | 0 | 21,242 |
Commercial lending | Commercial real estate (“CRE”) | Principal |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Post-Modification Outstanding Recorded Investment | 0 | 21,242 | 0 | 21,242 |
Commercial lending | Commercial real estate (“CRE”) | Principal and Interest |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Post-Modification Outstanding Recorded Investment | 0 | 0 | 0 | 0 |
Commercial lending | Commercial real estate (“CRE”) | Interest Deferments |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Post-Modification Outstanding Recorded Investment | 0 | 0 | 0 | 0 |
Commercial lending | Commercial real estate (“CRE”) | Interest Rate Reduction |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Post-Modification Outstanding Recorded Investment | 0 | 0 | 0 | 0 |
Commercial lending | Real estate loan | Multifamily residential |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Post-Modification Outstanding Recorded Investment | 1,118 | 1,226 | 1,118 | 1,226 |
Commercial lending | Real estate loan | Principal | Multifamily residential |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Post-Modification Outstanding Recorded Investment | 1,118 | 1,226 | 1,118 | 1,226 |
Commercial lending | Real estate loan | Principal and Interest | Multifamily residential |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Post-Modification Outstanding Recorded Investment | 0 | 0 | 0 | 0 |
Commercial lending | Real estate loan | Interest Deferments | Multifamily residential |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Post-Modification Outstanding Recorded Investment | 0 | 0 | 0 | 0 |
Commercial lending | Real estate loan | Interest Rate Reduction | Multifamily residential |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Post-Modification Outstanding Recorded Investment | 0 | 0 | 0 | 0 |
Commercial lending | Total CRE |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Post-Modification Outstanding Recorded Investment | 1,118 | 22,468 | 1,118 | 22,468 |
Commercial lending | Total CRE | Principal |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Post-Modification Outstanding Recorded Investment | 1,118 | 22,468 | 1,118 | 22,468 |
Commercial lending | Total CRE | Principal and Interest |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Post-Modification Outstanding Recorded Investment | 0 | 0 | 0 | 0 |
Commercial lending | Total CRE | Interest Deferments |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Post-Modification Outstanding Recorded Investment | 0 | 0 | 0 | 0 |
Commercial lending | Total CRE | Interest Rate Reduction |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Post-Modification Outstanding Recorded Investment |  | $ 0 | $ 0 | $ 0 |

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