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Loans Receivable and Allowance for Credit Losses (TDR Post-Modification) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post- Modification Outstanding Recorded Investment | $ 28,926 |  | $ 43,833 |
Principal |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post- Modification Outstanding Recorded Investment | 11,766 |  | 15,898 |
Principal and Interest |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post- Modification Outstanding Recorded Investment |  |  | 10,775 |
Interest Deferments |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post- Modification Outstanding Recorded Investment | 17,160 |  | 17,160 |
Commercial lending |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post- Modification Outstanding Recorded Investment | 28,926 |  | 43,833 |
Commercial lending | Principal |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post- Modification Outstanding Recorded Investment | 11,766 |  | 15,898 |
Commercial lending | Principal and Interest |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post- Modification Outstanding Recorded Investment |  |  | 10,775 |
Commercial lending | Interest Deferments |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post- Modification Outstanding Recorded Investment | 17,160 |  | 17,160 |
Commercial lending | Commercial and industrial (“C&I”) |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post- Modification Outstanding Recorded Investment | 28,926 |  | 43,833 |
Commercial lending | Commercial and industrial (“C&I”) | Principal |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post- Modification Outstanding Recorded Investment | 11,766 |  | 15,898 |
Commercial lending | Commercial and industrial (“C&I”) | Principal and Interest |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post- Modification Outstanding Recorded Investment |  |  | 10,775 |
Commercial lending | Commercial and industrial (“C&I”) | Interest Deferments |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post- Modification Outstanding Recorded Investment | 17,160 |  | 17,160 |
Consumer lending |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post- Modification Outstanding Recorded Investment | 0 |  | 0 |
Consumer lending | Principal |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post- Modification Outstanding Recorded Investment | 0 |  | 0 |
Consumer lending | Principal and Interest |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post- Modification Outstanding Recorded Investment |  |  | 0 |
Consumer lending | Interest Deferments |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post- Modification Outstanding Recorded Investment | 0 |  | 0 |
Consumer lending | Real estate loan | Single-family residential |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post- Modification Outstanding Recorded Investment | 0 |  | 0 |
Consumer lending | Real estate loan | Single-family residential | Principal |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post- Modification Outstanding Recorded Investment | 0 |  | 0 |
Consumer lending | Real estate loan | Single-family residential | Principal and Interest |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post- Modification Outstanding Recorded Investment |  |  | 0 |
Consumer lending | Real estate loan | Single-family residential | Interest Deferments |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post- Modification Outstanding Recorded Investment | 0 |  | 0 |
Consumer lending | Total residential mortgage |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post- Modification Outstanding Recorded Investment | 0 |  | 0 |
Consumer lending | Total residential mortgage | Principal |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post- Modification Outstanding Recorded Investment | 0 |  | 0 |
Consumer lending | Total residential mortgage | Principal and Interest |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post- Modification Outstanding Recorded Investment |  |  | 0 |
Consumer lending | Total residential mortgage | Interest Deferments |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post- Modification Outstanding Recorded Investment | $ 0 |  | $ 0 |
Non-PCI Loans |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post- Modification Outstanding Recorded Investment |  | $ 48,273 |  | $ 77,705
Non-PCI Loans | Principal |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post- Modification Outstanding Recorded Investment |  | 9,909 |  | 39,341
Non-PCI Loans | Other |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post- Modification Outstanding Recorded Investment |  | 38,364 |  | 38,364
Non-PCI Loans | Commercial lending |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post- Modification Outstanding Recorded Investment |  | 48,054 |  | 77,486
Non-PCI Loans | Commercial lending | Principal |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post- Modification Outstanding Recorded Investment |  | 9,909 |  | 39,341
Non-PCI Loans | Commercial lending | Other |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post- Modification Outstanding Recorded Investment |  | 38,145 |  | 38,145
Non-PCI Loans | Commercial lending | Commercial and industrial (“C&I”) |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post- Modification Outstanding Recorded Investment |  | 48,054 |  | 77,486
Non-PCI Loans | Commercial lending | Commercial and industrial (“C&I”) | Principal |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post- Modification Outstanding Recorded Investment |  | 9,909 |  | 39,341
Non-PCI Loans | Commercial lending | Commercial and industrial (“C&I”) | Other |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post- Modification Outstanding Recorded Investment |  | 38,145 |  | 38,145
Non-PCI Loans | Consumer lending |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post- Modification Outstanding Recorded Investment |  | 219 |  | 219
Non-PCI Loans | Consumer lending | Principal |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post- Modification Outstanding Recorded Investment |  | 0 |  | 0
Non-PCI Loans | Consumer lending | Other |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post- Modification Outstanding Recorded Investment |  | 219 |  | 219
Non-PCI Loans | Consumer lending | Real estate loan | Single-family residential |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post- Modification Outstanding Recorded Investment |  | 219 |  | 219
Non-PCI Loans | Consumer lending | Real estate loan | Single-family residential | Principal |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post- Modification Outstanding Recorded Investment |  | 0 |  | 0
Non-PCI Loans | Consumer lending | Real estate loan | Single-family residential | Other |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post- Modification Outstanding Recorded Investment |  | 219 |  | 219
Non-PCI Loans | Consumer lending | Total residential mortgage |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post- Modification Outstanding Recorded Investment |  | 219 |  | 219
Non-PCI Loans | Consumer lending | Total residential mortgage | Principal |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post- Modification Outstanding Recorded Investment |  | 0 |  | 0
Non-PCI Loans | Consumer lending | Total residential mortgage | Other |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post- Modification Outstanding Recorded Investment |  | $ 219 |  | $ 219

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