Borrowings - Securities Sold Under Agreements to Repurchase (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Debt Disclosure [Abstract]
Balance at year end	$ 40,716,000	$ 32,199,000
Average daily balance during the year	$ 36,453,000	$ 32,912,000
Average interest rate during the year	0.27%	0.61%
Maximum month-end balance during the year	$ 41,730,000	$ 40,282,000
Weighted average interest rate at year-end	0.21%	0.47%
Assets Sold under Agreements to Repurchase [Line Items]
Percentage of fair value of securities pledged of the outstanding balance of repurchase agreement	1
Borrowings outstanding under line of credit as federal funds purchased	$ 0	$ 0
Federal Funds Purchased
Assets Sold under Agreements to Repurchase [Line Items]
Line of credit	$ 325,000,000	$ 335,000,000