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Allowance for Credit Losses - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2025
Dec. 31, 2024
Provision (credit) for loan and lease losses:      
Reserve for unfunded credits $ 13,727 $ 13,727 $ 5,981
Provision for credit losses on unfunded commitments 8,400    
Allowance for credit loss, completion of revision, period from forecast start date   5 years  
Qualitative adjustments to models for credit risk, net 22,600 $ 22,600  
General allowance for loan and lease losses 184,300 184,300 107,500
Allowance for credit loss for loans acquired in business combination   84,400  
Specific allowance for loan and lease losses 69,400 69,400 $ 17,500
Specific allowance for loan and lease losses period increase (decrease)   51,900  
Holdco Merger      
Provision (credit) for loan and lease losses:      
Specific allowance for loan and lease losses period increase (decrease)   $ 46,600  
Minimum      
Provision (credit) for loan and lease losses:      
Allowance for credit loss, start of revision, period from forecast start date   2 years  
Maximum      
Provision (credit) for loan and lease losses:      
Allowance for credit loss, start of revision, period from forecast start date   3 years  
Legacy Berkshire Portfolio      
Provision (credit) for loan and lease losses:      
Qualitative adjustments to models for credit risk, net $ 3,500 $ 3,500  
Commercial Real Estate | Holdco Merger      
Provision (credit) for loan and lease losses:      
Specific allowance for loan and lease losses period increase (decrease)   28,200  
Commercial and Industrial Loans | Holdco Merger      
Provision (credit) for loan and lease losses:      
Specific allowance for loan and lease losses period increase (decrease)   18,200  
Consumer Loans | Holdco Merger      
Provision (credit) for loan and lease losses:      
Specific allowance for loan and lease losses period increase (decrease)   $ 200