Allowance for Credit Losses - Narrative (Details) $ in Millions	Jun. 30, 2020 USD ($) asset	Jan. 01, 2020 USD ($)
CRE
Financing Receivable, Allowance for Credit Loss [Line Items]
Number of assets | asset	1
Amortized cost basis of financing receivable	$ 0.4	$ 0.4
Land Operations
Financing Receivable, Allowance for Credit Loss [Line Items]
Number of assets | asset	3
Land Operations | First security, generated in 2008
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized cost basis of financing receivable	$ 1.6	1.6
Land Operations | Second security, generated in 2016
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized cost basis of financing receivable	11.4	13.5
Land Operations | Third security, generated in 2016
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized cost basis of financing receivable	$ 2.5	$ 2.6