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Borrowings and Subordinated Notes - Additional Information (Detail)
12 Months Ended
Jul. 30, 2021
USD ($)
Dec. 31, 2024
USD ($)
Loan
Dec. 31, 2023
USD ($)
Mar. 31, 2023
USD ($)
Sep. 29, 2022
USD ($)
Debt Instrument [Line Items]          
Number of loans secured | Loan   2      
Term note   $ 30,000,000      
Line of credit   10,000,000   $ 10,000,000 $ 10,000,000
Variable line of credit   $ 15,000,000      
Percentage of interest on loan accrued rate   2.50%      
Percentage of line of credit accrues rate         5.50%
Maturity date   Sep. 30, 2023      
Total borrowings excluding for fair value related to acquisition   $ 246,095,000 $ 265,800,000    
Total borrowings, fair value related to acquisition   39,000 23,000    
Advances, secured by mortgage loans   2,536,043,000 2,556,167,000    
Unsecured borrowings through correspondent banks   163,000,000 128,000,000.0    
Borrowing capacity under the Federal Reserve's BTFP     69,900,000    
Borrowings capacity under federal reserve bank discount window   29,900,000      
Unpledged securities which could be sold or used as collateral   170,400,000 97,300,000    
Additional borrowings available from the Federal Home Loan Bank based on current pledging   $ 159,500,000 42,500,000    
Debt instrument basis points 2.63%        
Debt instrument, frequency of periodic payment semi-annually        
Term of loan 5 years        
Redemption price of principal amount of notes redeemed 100.00%        
Prime Rate [Member]          
Debt Instrument [Line Items]          
Maturity date   Sep. 27, 2025      
Private Placement          
Debt Instrument [Line Items]          
Subordinated notes $ 35,000,000        
Fixed-to-floating interest rate 3.25%        
Subordinated notes, due date Jul. 30, 2031        
Percentage of notes prices on principal amount 100.00%        
Peoples Federal Savings and Loan Association [Member]          
Debt Instrument [Line Items]          
Bank undertook amount   $ 965,000      
Peoples Federal Savings and Loan Association [Member] | Minimum [Member]          
Debt Instrument [Line Items]          
Bank loan maturity year   2022      
Peoples Federal Savings and Loan Association [Member] | Maximum [Member]          
Debt Instrument [Line Items]          
Bank loan maturity year   2028      
Perpetual Federal Savings Bank {Member]          
Debt Instrument [Line Items]          
Bank undertook amount   $ 6,000,000      
Federal Home Loan Bank Advances [Member]          
Debt Instrument [Line Items]          
Bank entered Bermudan Putable advance   $ 15,000,000      
Term of debt   10 years      
Fixed rate   3.40%      
Collateral Pledged [Member] | Federal Home Loan Bank Advances [Member]          
Debt Instrument [Line Items]          
Pledging of eligible commercial real estate loans   $ 369,500,000 158,900,000    
Asset Pledged as Collateral without Right [Member] | Federal Home Loan Bank Advances [Member] | 1-4 Family Real Estate Loans [Member]          
Debt Instrument [Line Items]          
Advances, secured by mortgage loans   202,000,000      
Asset Pledged as Collateral without Right [Member] | Federal Home Loan Bank Advances [Member] | HALOC [Member]          
Debt Instrument [Line Items]          
Advances, secured by mortgage loans     232,000,000    
Multi-family Real Estate Loans [Member] | Asset Pledged as Collateral without Right [Member]          
Debt Instrument [Line Items]          
Advances, secured by mortgage loans   47,700,000      
Cash Management Advance          
Debt Instrument [Line Items]          
Unsecured borrowings through correspondent banks   $ 163,700,000 $ 150,100,000    
Term Note [Member]          
Debt Instrument [Line Items]          
Short term debt, term   12-month      
Line of Credit [Member]          
Debt Instrument [Line Items]          
Short term debt, term   12-month      
Outstanding borrowings   $ 0