Fair Values of Assets and Liabilities - Schedule of Assets Measured on Nonrecurring Basis (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Assets	$ 1,114,587	$ 938,309
Fair Value, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	54,785	49,147
Fair Value Measurement Of Assets On Nonrecurring Basis Net Losses On Impaired Loans	352	(7,905)
Other Real Estate Owned Assets Fair Value	729	1,319
Fair Value Measurement Of Assets On Nonrecurring Basis Net Losses On Other Real Estate Owned	0	(30)
Total Assets	55,514	50,466
Fair Value Measurement Of Assets On Nonrecurring Basis Net Loss	352	(7,935)
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Assets	0	0
Level 1 [Member] | Fair Value, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	0	0
Other Real Estate Owned Assets Fair Value	0	0
Total Assets	0	0
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Assets	1,098,436	930,020
Fair Value, Inputs, Level 2 [Member] | Fair Value, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	42,538	35,543
Other Real Estate Owned Assets Fair Value	729	1,319
Total Assets	43,267	36,862
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Assets	16,151	8,289
Level 3 [Member] | Fair Value, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	12,247	13,604
Other Real Estate Owned Assets Fair Value	0	0
Total Assets	$ 12,247	$ 13,604