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REGULATORY MATTERS, COMMITMENTS AND CONTINGENCIES - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Jan. 01, 2020
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]      
One-time charge associated with FDIC implementation of special assessment   $ 6.3  
Commercial And Financial Standby Letters Of Credit [Member]      
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]      
Commitments to extend credit $ 74.0    
Commitments To Extend Credit [Member]      
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]      
Commitments to extend credit 2,000.0    
Commitments To Extend Credit [Member] | Credit Card [Member]      
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]      
Commitments to extend credit $ 0.9    
ASU 2016-13      
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]      
Percentage Of Increase In ACL Adjusted In Capital Measures 25.00%   25.00%
CECL, amount excluded to be phased-on during after two years $ 16.2    
ASU 2016-13 | Cumulative Effect, Period of Adoption, Adjustment [Member] | Retained Earnings [Member]      
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]      
Cumulative Effect Of New Accounting Principle In Period Of Adoption 1     $ (48.6)
Basel III [Member]      
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]      
Capital Conservation Buffer 2.50%