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Premises and Equipment (Major Classifications) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, Gross | $ 2,261,459 | $ 2,159,367 |
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment | 1,010,176 | 914,971 |
Property, Plant and Equipment, Net | 1,251,283 | 1,244,396 |
Depreciation | 108,641 | 103,828 | $ 96,781
Land |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, Gross | 336,258 | 335,093 |
Premises and leasehold improvements |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, Gross | 1,286,092 | 1,228,588 |
Furniture, equipment and software |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, Gross | $ 639,109 | $ 595,686 |

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- Definition Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services. + 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 (c) -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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.14) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + 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 (b) -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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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