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		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Trust Preferred Securities [Member]
Beginning balance	$ 1,495	$ 1,068	$ 1,295	$ 1,332
Net gain (loss) from fair value adjustment of financial assets	53	82	254	(180)
Decrease in accrued interest receivable		(1)	(1)	(3)
Ending balance	1,548	1,149	1,548	1,149
Junior Subordinated Debentures [Member]
Beginning balance	49,814	35,570	43,136	44,384
Net loss (gain) from fair value adjustment of financial liabilities	1,850	2,897	8,837	(5,086)
Decrease in accrued interest payable	(1)	(19)	(6)	(104)
Change in unrealized gains included in other comprehensive income	(85)	(161)	(389)	(907)
Ending balance	51,578	38,287	51,578	38,287
Changes in unrealized gains held at period end	$ 3,058	$ 2,384	$ 3,058	$ 2,384