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Summary of Significant Accounting Policies - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2022
USD ($)
Branch
Property
Portfolio
Dec. 31, 2021
USD ($)
Dec. 31, 2020
Summary Of Significant Accounting Policies [Line Items]      
Number of branches | Branch 194    
Number of ATM | Property 188    
Wholly-owned trust subsidiaries | Property 11    
Held for sale securities, percentage of purchase price as condition for sale 15.00%    
Allowance for credit losses, held-to-maturity debt securities $ 220,000 $ 268,000  
Non-accrual status period 90 days    
Loans returned to accrual status, performance period 6 months    
Consumer loan TDR extended maturity period 6 months    
Number of categories of loan portfolio | Portfolio 3    
Indefinite - lived intangible assets $ 0    
Period of interest rate lock commitments 60 days    
ASU 2022-02 Financial Instruments - Credit Losses (Topic 326)      
Summary Of Significant Accounting Policies [Line Items]      
Change in Accounting Principle, Accounting Standards Update, Adoption Date Jan. 01, 2023    
ASU 2022-01 Derivatives and Hedging (Topic 815)      
Summary Of Significant Accounting Policies [Line Items]      
Change in Accounting Principle, Accounting Standards Update, Adopted [true false] true    
Change in Accounting Principle, Accounting Standards Update, Adoption Date Jan. 01, 2023    
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false] true    
ASU 2021-08 Business Combinations (Topic 805)      
Summary Of Significant Accounting Policies [Line Items]      
Change in Accounting Principle, Accounting Standards Update, Adopted [true false] true    
Change in Accounting Principle, Accounting Standards Update, Adoption Date Jan. 01, 2023    
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false] true    
ASU 2021-01 Reference Rate Reform (Topic 848)      
Summary Of Significant Accounting Policies [Line Items]      
Change in Accounting Principle, Accounting Standards Update, Adopted [true false] true    
Change in Accounting Principle, Accounting Standards Update, Adoption Date Dec. 31, 2021    
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false] true    
Land Improvements [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Property, plant and equipment, Useful life 15 years    
Mortgage-Backed Securities and Collateralized Mortgage Obligations of Government Sponsored Entities and Agencies [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Allowance for credit losses, held-to-maturity debt securities $ 0    
Consumer Loan [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Period of closed end loans loans charged down to net realizable value 120 days    
Home Equity [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Period of closed end loans loans charged down to net realizable value 180 days    
Residential Real Estate Loans [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Period of closed end loans loans charged down to net realizable value 180 days    
Minimum [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Percentage of voting interest     50.00%
Forecast period to measure expected credit losses on loan portfolio 1 year    
Model reversion period to measure expected credit losses on loan portfolio 1 year    
Weighted-average estimated useful lives 10 years    
Non-compete agreements, amortization period 1 year    
Minimum [Member] | Furniture and Equipment [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Property, plant and equipment, Useful life 3 years    
Minimum [Member] | Building and Building Improvements [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Property, plant and equipment, Useful life 15 years    
Maximum [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Forecast period to measure expected credit losses on loan portfolio 2 years    
Model reversion period to measure expected credit losses on loan portfolio 3 years    
Weighted-average estimated useful lives 16 years    
Non-compete agreements, amortization period 4 years    
Maximum [Member] | Furniture and Equipment [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Property, plant and equipment, Useful life 10 years    
Maximum [Member] | Building and Building Improvements [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Property, plant and equipment, Useful life 39 years    
Maximum [Member] | CARES Act, Paycheck Protection Program [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Loans receivable, threshold period past due 30 days