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Loans Receivable and Allowance for Credit Losses (Non-PCI TDR Modifications) (Details) - Non-PCI Loans - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post- Modification Outstanding Recorded Investment | $ 48,273 | $ 2,777 | $ 77,705 | $ 2,777
Principal |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post- Modification Outstanding Recorded Investment | 9,909 | 1,529 | 39,341 | 1,529
Interest Rate Reduction |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post- Modification Outstanding Recorded Investment | 0 | 837 | 0 | 837
Other (2) |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post- Modification Outstanding Recorded Investment | 38,364 | 411 | 38,364 | 411
Commercial lending |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post- Modification Outstanding Recorded Investment | 48,054 | 837 | 77,486 | 837
Commercial lending | Principal |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post- Modification Outstanding Recorded Investment | 9,909 | 0 | 39,341 | 0
Commercial lending | Interest Rate Reduction |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post- Modification Outstanding Recorded Investment | 0 | 837 | 0 | 837
Commercial lending | Other (2) |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post- Modification Outstanding Recorded Investment | 38,145 | 0 | 38,145 | 0
Commercial lending | Commercial and industrial (“C&I”) |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post- Modification Outstanding Recorded Investment | 48,054 | 0 | 77,486 | 0
Commercial lending | Commercial and industrial (“C&I”) | Principal |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post- Modification Outstanding Recorded Investment | 9,909 | 0 | 39,341 | 0
Commercial lending | Commercial and industrial (“C&I”) | Interest Rate Reduction |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post- Modification Outstanding Recorded Investment | 0 | 0 | 0 | 0
Commercial lending | Commercial and industrial (“C&I”) | Other (2) |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post- Modification Outstanding Recorded Investment | 38,145 | 0 | 38,145 | 0
Commercial lending | Commercial real estate (“CRE”) |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post- Modification Outstanding Recorded Investment | 0 | 837 | 0 | 837
Commercial lending | Commercial real estate (“CRE”) | Principal |  |  |  |
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 | 837 | 0 | 837
Commercial lending | Commercial real estate (“CRE”) | Other (2) |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post- Modification Outstanding Recorded Investment | 0 | 0 | 0 | 0
Consumer lending |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post- Modification Outstanding Recorded Investment | 219 | 1,940 | 219 | 1,940
Consumer lending | Principal |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post- Modification Outstanding Recorded Investment | 0 | 1,529 | 0 | 1,529
Consumer lending | Interest Rate Reduction |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post- Modification Outstanding Recorded Investment | 0 | 0 | 0 | 0
Consumer lending | Other (2) |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post- Modification Outstanding Recorded Investment | 219 | 411 | 219 | 411
Consumer lending | Real estate loan | Single-family residential |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post- Modification Outstanding Recorded Investment | 219 | 404 | 219 | 404
Consumer lending | Real estate loan | Single-family residential | Principal |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post- Modification Outstanding Recorded Investment | 0 | 65 | 0 | 65
Consumer lending | Real estate loan | Single-family residential | Interest Rate Reduction |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post- Modification Outstanding Recorded Investment | 0 | 0 | 0 | 0
Consumer lending | Real estate loan | Single-family residential | Other (2) |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post- Modification Outstanding Recorded Investment | 219 | 339 | 219 | 339
Consumer lending | HELOCs |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post- Modification Outstanding Recorded Investment | 0 | 1,536 | 0 | 1,536
Consumer lending | HELOCs | Principal |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post- Modification Outstanding Recorded Investment | 0 | 1,464 | 0 | 1,464
Consumer lending | HELOCs | Interest Rate Reduction |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post- Modification Outstanding Recorded Investment | 0 | 0 | 0 | 0
Consumer lending | HELOCs | Other (2) |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post- Modification Outstanding Recorded Investment | $ 0 | $ 72 | $ 0 | $ 72

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