Fair Value of Financial Instruments - Financial Assets and Liabilities Reported Under the Fair Value Option (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Financial Assets at Fair Value Option	$ 14,500		$ 14,500		$ 14,500
Net loss from fair value adjustments	(2,289)	$ (2,225)	(7,855)	$ 1,987
Collateralized Mortgage Backed Securities [Member]
Financial Assets at Fair Value Option	412		412		505
Net loss from fair value adjustments	(1)	(1)	(3)	1
Other Securities [Member]
Financial Assets at Fair Value Option	14,120		14,120		13,998
Net loss from fair value adjustments	6	83	7	120
Junior Subordinated Debentures [Member]
Financial Assets at Fair Value Option	51,578		51,578		$ 43,136
Net loss from fair value adjustments	(1,849)	(2,897)	(8,837)	5,086
Financial Assets and Liabilities, Excluding Interest Rate Caps / Swaps [Member]
Net loss from fair value adjustments	$ (1,844)	$ (2,815)	$ (8,833)	$ 5,207