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	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Trust Preferred Securities [Member]
Beginning balance	$ 1,332	$ 1,256
Net (loss) gain from fair value adjustment of financial assets	(34)	78
Increase (decrease) in accrued interest receivable	(3)	(2)
Ending balance	1,295	1,332
Junior Subordinated Debentures [Member]
Beginning balance	44,384	41,849
Net loss (gain) from fair value adjustment of financial liabilities	50	2,803
Increase (decrease) in accrued interest receivable	(103)	(39)
Change in unrealized gains included in other comprehensive income	(1,195)	(229)
Ending balance	43,136	44,384
Changes in unrealized gains held at period end	$ 2,670	$ 1,476