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Bank Premises and Equipment (Tables) | 12 Months Ended
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Dec. 31, 2021
Summary of bank premises and equipment, by asset classification | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Estimated | ​ | ​ | ​ | ​ | ​ | ​ |
​ | ​ | useful lives | ​ | 2021 | ​ | 2020 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | (Dollars in Thousands) |
Bank buildings and improvements |  | 5 | - | 39 | years |  | $ | 573,276 |  | $ | 577,656 | ​
Furniture, equipment and vehicles |  | 1 | - | 20 | years | ​ |  | 302,847 | ​ |  | 311,313 | ​
Land | ​ | ​ | ​ | ​ | ​ | ​ |  | 113,118 | ​ |  | 117,848 | ​
Less: accumulated depreciation | ​ | ​ | ​ | ​ | ​ | ​ |  | (542,159) | ​ |  | (526,939) | ​
Bank premises and equipment, net | ​ | ​ | ​ | ​ | ​ | ​ | $ | 447,082 | ​ | $ | 479,878 | ​

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: 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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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