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Premises and Equipment, Net
 12 Months Ended
Dec. 31, 2020
Property, Plant and Equipment [Abstract]  
Premises and Equipment, net Premises and Equipment, net
    The following is a summary of our premises and equipment.

December 31,
20202019
Land and land improvements$12,356 $12,356 
Buildings and leasehold improvements120,971 105,986 
Furniture, fixtures and equipment28,272 25,694 
Software76,500 70,191 
Premises and equipment, gross238,099 214,227 
Accumulated depreciation(83,429)(79,478)
Premises and equipment, net$154,670 $134,749 
    Depreciation expense for premises and equipment was $15 million, $15 million and $14 million for the years ended December 31, 2020, 2019 and 2018, respectively.