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Loans and ACL - Additional Information (Detail)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2023
USD ($)
Jun. 30, 2022
USD ($)
Jun. 30, 2023
USD ($)
Loan
Jun. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
Loan
Mar. 31, 2023
USD ($)
Jan. 01, 2023
USD ($)
Mar. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Loans and Leases Receivable Disclosure [Line Items]                  
Loans and lease reserve $ 43,067 $ 17,242 $ 43,067 $ 17,242 $ 22,939 [1] $ 29,974   $ 12,013 $ 12,121
Charge-offs 9,000   10,300            
Gross loans 2,458,604   2,458,604   $ 2,412,699        
Interest income from nonaccrual loans 0   89            
Number of doubtful loans | Loan         0        
Loans pledged 2,458,604   2,458,604            
Nonperforming trouble debt restructuring         $ 1,100        
Amortized Cost of PCD Loans     57,100            
Non-Credit Discount on PCD Loans     5,000            
Allowance for Loan and Lease Losses, Write-offs 9,020 2,791 10,329 5,567          
Mortgage loans with amortized cost     645   0        
Amortized cost of ACL related to PCD loans     601            
Cash payments received     4,500            
Nonaccrual 83,715   83,715   10,324        
January 1, 2023 Post-ASC 326 Adoption [Member]                  
Loans and Leases Receivable Disclosure [Line Items]                  
Loans and lease reserve (4,000)   (4,000)       $ 26,961    
Nonaccrual [Member]                  
Loans and Leases Receivable Disclosure [Line Items]                  
Amortized Cost Of Loans Modified Nonaccrual Status     46,876            
Risk Grade 8                  
Loans and Leases Receivable Disclosure [Line Items]                  
Loans pledged 5,753   5,753            
Commercial and industrial loan amount     5,300            
Grade 5 Pass/Watch [Member]                  
Loans and Leases Receivable Disclosure [Line Items]                  
Gross loans         143,207        
Paycheck Protection Plan Liquidity Facility Advances [Member] | Asset Pledged as Collateral without Right [Member] | Federal Home Loan Bank Advances [Member]                  
Loans and Leases Receivable Disclosure [Line Items]                  
Loans pledged 0   0   51,000        
Collateral Pledged [Member]                  
Loans and Leases Receivable Disclosure [Line Items]                  
Loans and lease reserve 8,000   8,000            
Minimum [Member]                  
Loans and Leases Receivable Disclosure [Line Items]                  
Nonaccrual 73,400   $ 73,400   10,300        
Minimum [Member] | Grade 5 Pass/Watch [Member]                  
Loans and Leases Receivable Disclosure [Line Items]                  
Loan To Value Ratio     90.00%            
Maximum [Member]                  
Loans and Leases Receivable Disclosure [Line Items]                  
Nonaccrual 83,700   $ 83,700            
Commercial Loan [Member]                  
Loans and Leases Receivable Disclosure [Line Items]                  
Attributable to specific reserve 7,000                
Commercial and Residential Mortgages [Member] | Asset Pledged as Collateral without Right [Member] | Federal Home Loan Bank Advances [Member]                  
Loans and Leases Receivable Disclosure [Line Items]                  
Loans pledged 601,900   601,900   436,000        
Commercial and Industrial [Member]                  
Loans and Leases Receivable Disclosure [Line Items]                  
Modified term extension and forbearance amortized cost 37,300   37,250            
Attributable to specific reserve     14,100            
Loans and lease reserve 34,364   34,364   19,269 $ 21,279      
Gross loans 545,921   545,921   590,049        
Loans pledged 545,921   545,921            
Allowance for Loan and Lease Losses, Write-offs 7,326 $ 1,383 8,095 $ 3,746          
Nonaccrual 61,848   61,848   2,314        
Commercial and Industrial [Member] | January 1, 2023 Post-ASC 326 Adoption [Member]                  
Loans and Leases Receivable Disclosure [Line Items]                  
Loans and lease reserve 4,000   $ 4,000            
Commercial and Industrial [Member] | Nonaccrual [Member]                  
Loans and Leases Receivable Disclosure [Line Items]                  
Number of loans | Loan     1            
Amortized Cost Of Loans Modified Nonaccrual Status     $ 37,250            
Nonaccrual 37,300   37,300            
Paycheck Protection Program [Member]                  
Loans and Leases Receivable Disclosure [Line Items]                  
Gross loans 7,234   7,234   $ 11,967        
Loans pledged $ 7,234   $ 7,234            
[1] Derived from audited December 31, 2022 Consolidated Financial Statements.