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Premises and Equipment (Narrative) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jan. 01, 2019
Property, Plant and Equipment [Line Items] |  |  |  |  |
Depreciation |  | $ 49,900 | $ 41,000 | $ 37,200 |
Operating leases, rent expense, net |  | 46,000 | 42,100 | 31,100 |
Operating Lease, Right-of-Use Asset |  | 292,087 | 297,736 |  | $ 170,500
Operating lease, payments |  | 31,600 | 27,500 |  |
Recognition of right of use asset related to the new corporate headquarters facility | $ 121,700 |  |  |  |
Recognition of operating lease liability related to the new corporate headquarters facility | $ 121,700 |  |  |  |
Current period amortization of deferred gain |  |  | 1,400 | 2,800 |
Other Liabilities [Member] |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Operating lease, liability |  | 323,044 | 323,700 |  | $ 174,400
Partnership Interest [Member] |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Operating leases, rent expense, net |  | $ 9,800 | $ 5,900 | $ 464 |

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- Definition Recognition of right of use asset related to the new corporate headquarters facility + References No definition available. + Details
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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details
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- Definition Present value of lessee's discounted obligation for lease payments from operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977 + Details
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