Fair Value - Impaired Loans Held-for-investment - Additional Disclosures (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Impaired Loans Held-for-investment
Impaired loans held-for-investment	$ 10,264,000	$ 15,140,000
Additional provision (credit) for loan losses	2,128,000	(7,042,000,000)
Carrying amount
Impaired Loans Held-for-investment
Foreclosed assets	0	0
Carried at fair value
Impaired Loans Held-for-investment
Impaired loans held-for-investment	2,697,000	7,646,000
Specific valuation allowance	1,835,000	6,944,000
Portion carried at cost
Impaired Loans Held-for-investment
Impaired loans held-for-investment	$ 7,567,000	$ 7,494,000