Loans and Allowance for Loan Losses - Summary of Purchased Loans (Detail) - Real Estate [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
30-89 Days Past Due [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Purchase loans	$ 147	$ 259
30-89 Days Past Due [Member] | Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Purchase loans	0
30-89 Days Past Due [Member] | Construction, Commercial [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Purchase loans	0
30-89 Days Past Due [Member] | Mortgage, Commercial [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Purchase loans	0	224
30-89 Days Past Due [Member] | Mortgage, Residential [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Purchase loans	147	35
30-89 Days Past Due [Member] | Consumer Loans [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Purchase loans
Greater than 90 Days Past Due & Accruing [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Purchase loans	4
Greater than 90 Days Past Due & Accruing [Member] | Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Purchase loans
Greater than 90 Days Past Due & Accruing [Member] | Construction, Commercial [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Purchase loans	0
Greater than 90 Days Past Due & Accruing [Member] | Mortgage, Commercial [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Purchase loans	0
Greater than 90 Days Past Due & Accruing [Member] | Mortgage, Residential [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Purchase loans	0
Greater than 90 Days Past Due & Accruing [Member] | Consumer Loans [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Purchase loans	4
Current [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Purchase loans	83,878	826
Current [Member] | Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Purchase loans	8,903
Current [Member] | Construction, Commercial [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Purchase loans	14,754	35
Current [Member] | Mortgage, Commercial [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Purchase loans	51,872	584
Current [Member] | Mortgage, Residential [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Purchase loans	7,474	207
Current [Member] | Consumer Loans [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Purchase loans	875
Total Loan [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Purchase loans	84,029	1,085
Total Loan [Member] | Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Purchase loans	8,903
Total Loan [Member] | Construction, Commercial [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Purchase loans	14,754	35
Total Loan [Member] | Mortgage, Commercial [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Purchase loans	51,872	808
Total Loan [Member] | Mortgage, Residential [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Purchase loans	7,621	$ 242
Total Loan [Member] | Consumer Loans [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Purchase loans	$ 879