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Premises and Equipment and Leases | 12 Months Ended
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Dec. 31, 2020
Property, Plant and Equipment [Abstract] |
Premises and Equipment Disclosure [Text Block] | Premises and Equipment and Leases Premises and equipment at December 31 are summarized as follows (in thousands):
|  | December 31,
|  | 2020 |  | 2019
Land |  | $ | 69,776 |  |  | $ | 69,960 |
Buildings and improvements |  | 440,528 |  |  | 421,952 |
Software and related integration |  | 120,444 |  |  | 98,487 |
Furniture and equipment |  | 165,344 |  |  | 135,153 |
Construction in progress |  | 46,949 |  |  | 53,498 |
Premises and equipment |  | 843,041 |  |  | 779,050 |
Less accumulated depreciation |  | 291,733 |  |  | 243,531 |
Premises and equipment, net of accumulated depreciation |  | $ | 551,308 |  |  | $ | 535,519 |
Depreciation expense of premises and equipment was $54.3 million, $51.6 million and $51.2 million for the years ended December 31, 2020, 2019 and 2018, respectively. Effective January 1, 2019, premises and equipment included right-of-use assets for leased office space and facilities. Leases are at market rates at inception and may contain escalations based on consumer price index or similar benchmarks and options to renew at then market rates. Right-of-use assets of $166 million at December 31, 2020 and $180 million at December 31, 2019 are included in buildings and improvements and related right-of-use liabilities are included in other liabilities. At December 31, 2020, the weighted-average remaining lease term was 11 years and the weighted average discount rate on operating leases was 3.0 percent. Operating lease costs recognized as occupancy and equipment expense were $25.0 million and $24.2 million for the years ended December 31, 2020 and December 31, 2019, respectively. Operating cash flows from operating leases were $25.6 million and $23.3 million for the years ended December 31, 2020 and December 31, 2019, respectively. Total rent expense for BOK Financial was $42.0 million in 2020, $43.0 million in 2019 and $28.5 million in 2018. At December 31, 2020, un-discounted operating lease liabilities are scheduled to mature as follows: $26.3 million in 2021, $21.2 million in 2022, $20.1 million in 2023, $19.6 million in 2024, $18.9 million in 2025 and $116 million thereafter. Operating expense and short term lease costs total $13.4 million and $12.6 million for the year ended December 31, 2020 and December 31, 2019, respectively. BOKF, NA is obligated under a long-term lease for its bank premises in downtown Tulsa. The original lease dated November 1, 1976 was renegotiated on July 1, 2019. The new lease will terminate on December 31, 2034. The Company has the option to renew for an additional 10 years. Premises leases may include options to renew at then current market rates and may include escalation provisions based upon changes in consumer price index or similar benchmarks. The Company may lease owned properties or sublease unoccupied leased facilities. Income on these leases is immaterial.

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- Definition The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=120429125&loc=SL120174063-112916 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99779-112916 + Details
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