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Significant Accounting Policies - Narrative (Details)
 12 Months Ended
Dec. 31, 2018
Disclosure of detailed information about property, plant and equipment [line items]  
Intangible asset useful life 40 years
Owner-occupied properties | Bottom of range  
Disclosure of detailed information about property, plant and equipment [line items]  
Property useful life 25 years
Owner-occupied properties | Top of range  
Disclosure of detailed information about property, plant and equipment [line items]  
Property useful life 49 years
Furniture, computers, and other office equipment, and leasehold improvements | Bottom of range  
Disclosure of detailed information about property, plant and equipment [line items]  
Property useful life 2 years
Furniture, computers, and other office equipment, and leasehold improvements | Top of range  
Disclosure of detailed information about property, plant and equipment [line items]  
Property useful life 20 years