Securities - Additional Information (Details)	12 Months Ended
	Dec. 31, 2020 USD ($) security item	Dec. 31, 2019 USD ($)
Additional Information
The number of holdings of securities of any one issuer other than the U.S. Government and its sponsored entities | security	0
Holdings of securities as percentage of shareholders' equity, considered as threshold for disclosure purpose	10.00%
Number of securities held | item	407
Number of available for sale securities held | item	116
Number of held to maturity securities held | item	291
Number of securities with fair values below amortized cost | item	5
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value | $	$ 30,930,000	$ 139,744,000
Total unrealized loss for securities less than 12 months | $	(230,000)
Agency mortgage-backed securities
Additional Information
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value | $	$ 30,930,000	138,188,000
Municipals - exempt from Federal tax
Additional Information
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value | $		$ 1,556,000