v3.26.1
LOANS AND ALLOWANCE FOR CREDIT LOSSES - Narrative (Details)
 1 Months Ended 3 Months Ended 6 Months Ended
Mar. 31, 2026
USD ($)
Jun. 30, 2026
USD ($)
loan
Mar. 31, 2026
USD ($)
Jun. 30, 2025
USD ($)
Jun. 30, 2026
USD ($)
loan_segment
Jun. 30, 2025
USD ($)
Dec. 31, 2025
USD ($)
Mar. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Loans   $ 15,530,737,000     $ 15,530,737,000   $ 13,791,707,000    
Increase in non-accrual         46,400,000        
Interest income recognized on non-accrual loans   0   $ 0 0 $ 0      
Payment defaults         $ 9,000,000.0 4,800,000      
Number of loan segments | loan_segment         12        
Allowance for credit losses (decrease) increase         $ 46,000,000.0        
ACL - Loans $ (212,520,000) (241,615,000) $ (212,520,000) (195,316,000) (241,615,000) (195,316,000) (195,597,000) $ (192,031,000) $ (192,757,000)
Net charge-offs   3,900,000     14,200,000        
Provision for credit losses   $ 33,000,000   5,600,000 $ 37,900,000 9,800,000      
Standby letters of credit usual term   2 years     2 years        
Provision for credit losses on unfunded commitments   $ 0   $ 0 $ 500,000 0      
Loans held for sale   77,880,000     77,880,000   20,079,000    
Loss on transfer     $ 29,800,000            
Proceeds from sale of mortgage loan   271,100,000              
Reclassification of loans from held for sale to loans   47,100,000     47,139,000 $ 0      
Performing Residential Mortgage Loans                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Principal balance $ 357,000,000.0                
Allowance on Collateral Dependent Loans                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Increase (decrease) in individually evaluated for impairment         19,900,000        
Increase (decrease) allowance for credit loss, recovery         10,100,000        
ACL - Loans   (27,335,000)     (27,335,000)   (17,280,000)    
Commercial and industrial loans                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Loans   4,720,441,000     4,720,441,000   4,478,282,000    
Increase in non-accrual   $ 41,800,000              
Number of loans placed on nonaccrual status | loan   2              
Commercial and industrial loans | Allowance on Collateral Dependent Loans                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Increase (decrease) in individually evaluated for impairment         24,500,000        
Increase (decrease) allowance for credit loss, recovery         10,900,000        
ACL - Loans   $ (24,080,000)     (24,080,000)   (13,157,000)    
Construction                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Loans   874,419,000     874,419,000   804,775,000    
Construction | Allowance on Collateral Dependent Loans                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Increase (decrease) in individually evaluated for impairment         (12,400,000)        
ACL - Loans   (167,000)     (167,000)   0    
Commercial real estate, owner occupied                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Loans   1,368,627,000     1,368,627,000   1,237,100,000    
Commercial real estate, owner occupied | Allowance on Collateral Dependent Loans                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Increase (decrease) in individually evaluated for impairment         5,100,000        
ACL - Loans   (934,000)     (934,000)   0    
Home equity                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Loans   1,118,662,000     1,118,662,000   710,980,000    
Home equity | Allowance on Collateral Dependent Loans                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
ACL - Loans   (17,000)     (17,000)   (19,000)    
Commercial real estate, non-owner occupied                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Loans   3,271,620,000     3,271,620,000   2,338,666,000    
Increase (decrease) in past due loans         (13,000,000.0)        
Commercial real estate, non-owner occupied | Allowance on Collateral Dependent Loans                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Increase (decrease) in individually evaluated for impairment         (2,100,000)        
ACL - Loans   (1,819,000)     (1,819,000)   (3,938,000)    
Residential                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Loans   2,361,480,000     2,361,480,000   2,420,310,000    
Past Due                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Loans   154,600,000     154,600,000   130,900,000    
Increase (decrease) in past due loans         23,700,000        
30-59 Days Past Due                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Loans   56,790,000     56,790,000   53,731,000    
Increase (decrease) in past due loans         3,100,000        
30-59 Days Past Due | Commercial and industrial loans                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Loans   16,064,000     16,064,000   7,194,000    
Increase (decrease) in past due loans         8,900,000        
30-59 Days Past Due | Construction                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Loans   34,000     34,000   0    
30-59 Days Past Due | Residential and commercial real estate                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Increase (decrease) in past due loans         (2,300,000)        
30-59 Days Past Due | Commercial real estate, owner occupied                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Loans   10,223,000     10,223,000   4,295,000    
Increase (decrease) in past due loans         5,900,000        
30-59 Days Past Due | Home equity                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Loans   8,759,000     8,759,000   4,717,000    
Increase (decrease) in past due loans         4,000,000.0        
30-59 Days Past Due | Commercial real estate, non-owner occupied                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Loans   6,149,000     6,149,000   19,125,000    
30-59 Days Past Due | Residential                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Loans   14,907,000     14,907,000   17,182,000    
60-89 Days Past Due                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Loans   27,010,000     27,010,000   15,567,000    
Increase (decrease) in past due loans         11,400,000        
60-89 Days Past Due | Commercial and industrial loans                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Loans   1,107,000     1,107,000   1,160,000    
60-89 Days Past Due | Construction                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Loans   5,765,000     5,765,000   0    
Increase (decrease) in past due loans         5,800,000        
60-89 Days Past Due | Commercial real estate, owner occupied                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Loans   2,403,000     2,403,000   2,880,000    
60-89 Days Past Due | Home equity                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Loans   3,219,000     3,219,000   1,427,000    
Increase (decrease) in past due loans         1,800,000        
60-89 Days Past Due | Commercial real estate, non-owner occupied                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Loans   6,549,000     6,549,000   345,000    
Increase (decrease) in past due loans         6,200,000        
60-89 Days Past Due | Residential                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Loans   7,372,000     7,372,000   9,536,000    
Increase (decrease) in past due loans         2,200,000        
90 Days or More Past Due                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Loans   70,752,000     70,752,000   61,576,000    
Increase (decrease) in past due loans         9,200,000        
90 Days or More Past Due | Commercial and industrial loans                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Loans   9,898,000     9,898,000   10,086,000    
90 Days or More Past Due | Construction                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Loans   9,914,000     9,914,000   23,776,000    
Increase (decrease) in past due loans         (13,900,000)        
90 Days or More Past Due | Commercial real estate, owner occupied                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Loans   7,431,000     7,431,000   2,477,000    
Increase (decrease) in past due loans         5,000,000.0        
90 Days or More Past Due | Home equity                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Loans   4,850,000     4,850,000   3,476,000    
90 Days or More Past Due | Commercial real estate, non-owner occupied                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Loans   13,431,000     13,431,000   572,000    
Increase (decrease) in past due loans         12,900,000        
90 Days or More Past Due | Owner occupied residential loans                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Increase (decrease) in past due loans         3,300,000        
90 Days or More Past Due | Residential                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Loans   $ 24,253,000     $ 24,253,000   $ 20,955,000