v3.26.1
Funds Borrowed - Additional Information (Detail) - USD ($)
3 Months Ended
Dec. 31, 2007
Jun. 30, 2007
Mar. 31, 2026
Dec. 31, 2025
Feb. 28, 2024
Dec. 31, 2021
Debt Instrument [Line Items]            
Time deposits     $ 2,133,710,000      
Listing services deposits from other financial institutions.     18,200,000 $ 17,200,000    
Retail savings deposit balance     $ 2,800,000 $ 3,700,000    
Interest Rate [1]     4.13%      
Investment, Type [Extensible Enumeration]           Equity Securities [Member]
Issue of common stock     30,145,347 29,592,592    
Preferred securities repurchased from a third party investor $ 2,000,000          
Medallion Capital, Inc. [Member]            
Debt Instrument [Line Items]            
Debt instrument face amount         $ 18,500,000  
Trust Preferred Securities [Member]            
Debt Instrument [Line Items]            
Maturity date     Sep. 30, 2037      
Aggregate principal amount of unsecured junior subordinated notes   $ 36,100,000        
Investment, Type [Extensible Enumeration]   Unsecured Debt [Member]        
Sale of preferred securities   $ 35,000,000        
Issue of common stock   1,083        
Basis spread on variable rate     2.13%      
Description of variable rate basis     26 basis points      
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]     Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]      
Preferred securities outstanding     $ 33,000,000      
Small Business Administration Debentures and Borrowings [Member]            
Debt Instrument [Line Items]            
Interest Rate [1]     4.11%      
Loan commitment term     4 years 6 months      
Commitment fee percentage     1.00%      
Federal reserve discount window and other borrowings [Member]            
Debt Instrument [Line Items]            
Home improvement loans pledged     $ 1,500      
Pledged Securities Advance Rate of Book Value     58.00%      
Line of credit facility maximum borrowing capacity     $ 884,200      
Long-term Line of Credit     $ 40,000      
Interest Rate     3.75%      
Commercial Banks [Member]            
Debt Instrument [Line Items]            
Line of credit facility maximum borrowing capacity     $ 75,000,000      
Line of credit outstanding     0      
Maximum [Member]            
Debt Instrument [Line Items]            
Time deposits     250,000,000      
Minimum [Member]            
Debt Instrument [Line Items]            
Time deposits     250,000,000      
Minimum [Member] | Bank Time Deposits [Member]            
Debt Instrument [Line Items]            
Brokered time deposits     $ 250,000,000      
Brokerage [Member] | Maximum [Member]            
Debt Instrument [Line Items]            
Average brokerage fee percentage in relation to the maturity of deposits     0.15%      
[1] Weighted average contractual rate as of March 31, 2026.