Fair Value of Financial Instruments - Assets and Liabilities Carried at Fair Value on a Recurring Basis, Classified Within Level 3 (Details) - Fair Value, Inputs, Level 3 [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Trust Preferred Securities [Member]
Beginning balance	$ 1,295	$ 1,332
Net gain from fair value adjustment of financial assets	47	24
Decrease in accrued interest receivable		(1)
Ending balance	1,342	1,355
Junior Subordinated Debentures [Member]
Beginning balance	43,136	44,384
Net loss from fair value adjustment of financial liabilities	1,460	2,351
Decrease in accrued interest payable	(4)	(24)
Change in unrealized gains included in other comprehensive income	120	(1,585)
Ending balance	44,712	45,126
Changes in unrealized gains held at period end	$ 2,551	$ 3,062