Securities Sold Under Agreements to Repurchase and Federal Funds Purchased (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Retail Repurchase Agreements
Repurchase Agreement Counterparty [Line Items]
Outstanding agreements to repurchase	$ 65,800,000
Wholesale Repurchase Agreements
Repurchase Agreement Counterparty [Line Items]
Outstanding agreements to repurchase	0
Securities Sold Under Agreements to Repurchase
Repurchase Agreement Counterparty [Line Items]
Outstanding agreements to repurchase	65,845,000	$ 60,346,000	$ 81,842,000
Maximum month-end balance	72,883,000	71,875,000	81,842,000
Average balance during the year	$ 55,973,000	$ 59,742,000	$ 63,472,000
Weighted average rate at December 31	0.11%	0.22%	0.22%
Average interest rate paid during the year	0.17%	0.24%	0.24%
Federal Funds Purchased
Repurchase Agreement Counterparty [Line Items]
Average balance during the year	$ 0	$ 82,000	$ 0
Average interest rate paid during the year	0.00%	2.86%	0.00%