Federal Funds Purchased and Securities Sold Under Agreement to Repurchase - Schedule of Remaining Contractual Maturity in Repurchase Agreements and Collateral Pledged (Detail) - USD ($)	Dec. 31, 2022	Dec. 31, 2021
Assets Sold under Agreements to Repurchase [Line Items]
Federal funds purchased	$ 22,573,000	$ 0
Repurchase agreements, Remaining contractual maturity of the agreements	31,600,000
Total	54,206,000	$ 29,268,000
US Treasury & Agency Securities [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements, Remaining contractual maturity of the agreements	31,633,000
Overnight & Continuous [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Federal funds purchased	22,573,000
Total	23,688,000
Overnight & Continuous [Member] | US Treasury & Agency Securities [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements, Remaining contractual maturity of the agreements	1,115,000
Greater Than 90 Days [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Total	30,518,000
Greater Than 90 Days [Member] | US Treasury & Agency Securities [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements, Remaining contractual maturity of the agreements	$ 30,518,000