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Loans Receivable and Allowance for Credit Losses (Composition of Loans Held-for-Investment- Narrative) (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |
Accrued interest receivable | $ 111,800,000 | $ 111,800,000 | $ 121,800,000
Interest income related to nonaccrual loans reversed | 1,200,000 | 1,600,000 |
Interest income recognized on nonaccrual loans | 10,000 | 12,000 |
Loans receivable pledged to secure borrowings and to provide additional borrowing capacity from the FRB and the FHLB | 27,408,027,000 | 27,408,027,000 | $ 22,431,092,000
HELOCs |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |
Converted to term loan | 12,100,000 | 43,400,000 |
Commercial And Industrial And Commercial Real Estate |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |
Converted to term loan | $ 0 | $ 0 |

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- Definition Amount, before allowance for credit loss, of accrued interest on financing receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 3B -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL120267963-210447 + Details
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- Definition Amount of interest income on financing receivable on nonaccrual status. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 16 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919258-210447 + Details
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- Definition Carrying amount as of the balance sheet date of loans that have been pledged as collateral for borrowings. If the secured party has the right by contract or custom to sell or re-pledge the collateral, then the debtor reclassifies that asset and report that asset in its statement of financial position separately from other assets not so encumbered. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66007379&loc=d3e113888-111728 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5086-111524 + Details
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