v3.26.3
LOANS AND ALLOWANCE FOR CREDIT LOSSES - Narrative (Details)
 1 Months Ended 3 Months Ended 9 Months Ended
Mar. 31, 2026
USD ($)
Sep. 30, 2026
USD ($)
loan
Jun. 30, 2026
USD ($)
Mar. 31, 2026
USD ($)
Sep. 30, 2025
USD ($)
Sep. 30, 2026
USD ($)
loan_segment
loan
Sep. 30, 2025
USD ($)
Dec. 31, 2025
USD ($)
Jun. 30, 2025
USD ($)
Dec. 31, 2024
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Loans   $ 15,600,974,000       $ 15,600,974,000   $ 13,791,707,000    
Nonaccrual Loans   117,415,000       117,415,000   71,773,000    
Increase (decrease) in non-accrual           45,600,000        
Interest income recognized on non-accrual loans   0     $ 0 0 $ 0      
Payment defaults           $ 7,200,000 5,000,000.0      
Number of loan segments | loan_segment           12        
ACL - Loans increase           $ 19,900,000        
ACL - Loans   215,526,000 $ 241,615,000   194,468,000 215,526,000 194,468,000 195,597,000 $ 195,316,000 $ 192,757,000
Net charge-offs   29,400,000     5,100,000 43,600,000 12,400,000      
Provision for credit losses   $ 3,300,000     4,300,000 $ 41,200,000 14,100,000      
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   87,300,000       87,300,000   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           14,700,000        
Increase (decrease) allowance for credit loss, recovery           7,500,000        
ACL - Loans   24,793,000       24,793,000   17,280,000    
Commercial and industrial loans                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Loans   4,578,572,000       4,578,572,000   4,478,282,000    
Nonaccrual Loans   $ 44,727,000       44,727,000   10,548,000    
Increase (decrease) in non-accrual           $ 34,200,000        
Commercial lending relationships | loan   2       2        
Commercial and industrial loans | Commercial Borrower                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Increase (decrease) in non-accrual           $ 29,700,000        
Number of loans | loan   3       3        
Commercial and industrial loans | Allowance on Collateral Dependent Loans                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Increase (decrease) in individually evaluated for impairment           $ 18,100,000        
Increase (decrease) allowance for credit loss, recovery           7,300,000        
ACL - Loans   $ 20,453,000       20,453,000   13,157,000    
Construction                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Loans   959,483,000       959,483,000   804,775,000    
Nonaccrual Loans   9,718,000       9,718,000   22,481,000    
Increase (decrease) in non-accrual           $ (12,800,000)        
Number of borrower relationships | loan           1        
Construction | Allowance on Collateral Dependent Loans                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Increase (decrease) in individually evaluated for impairment           $ (12,500,000)        
ACL - Loans   186,000       186,000   0    
Commercial real estate, owner occupied                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Loans   1,440,264,000       1,440,264,000   1,237,100,000    
Nonaccrual Loans   11,031,000       11,031,000   3,705,000    
Increase (decrease) in non-accrual           7,300,000        
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           5,800,000        
ACL - Loans   1,291,000       1,291,000   0    
Home equity                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Loans   1,139,040,000       1,139,040,000   710,980,000    
Nonaccrual Loans   6,865,000       6,865,000   4,158,000    
Home equity | Allowance on Collateral Dependent Loans                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
ACL - Loans   286,000       286,000   19,000    
Commercial real estate, non-owner occupied                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Loans   3,208,902,000       3,208,902,000   2,338,666,000    
Increase (decrease) in past due loans           (10,300,000)        
Nonaccrual Loans   9,619,000       9,619,000   837,000    
Increase (decrease) in non-accrual           8,800,000        
Commercial real estate, non-owner occupied | Commercial Borrower                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Increase (decrease) in non-accrual           $ 8,700,000        
Number of borrower relationships | loan           1        
Commercial real estate, non-owner occupied | Allowance on Collateral Dependent Loans                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
ACL - Loans   2,126,000       $ 2,126,000   3,938,000    
Residential                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Loans   2,419,376,000       2,419,376,000   2,420,310,000    
Nonaccrual Loans   35,142,000       35,142,000   29,774,000    
Increase (decrease) in non-accrual           5,400,000        
Past Due                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Loans   141,600,000       141,600,000   130,900,000    
Increase (decrease) in past due loans           10,700,000        
30-59 Days Past Due                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Loans   42,159,000       42,159,000   53,731,000    
Increase (decrease) in past due loans           (11,600,000)        
30-59 Days Past Due | Commercial and industrial loans                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Loans   6,603,000       6,603,000   7,194,000    
30-59 Days Past Due | Construction                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Loans   113,000       113,000   0    
30-59 Days Past Due | Commercial real estate, owner occupied                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Loans   1,921,000       1,921,000   4,295,000    
30-59 Days Past Due | Home equity                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Loans   8,920,000       8,920,000   4,717,000    
30-59 Days Past Due | Commercial real estate, non-owner occupied                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Loans   8,831,000       8,831,000   19,125,000    
30-59 Days Past Due | Residential                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Loans   14,505,000       14,505,000   17,182,000    
60-89 Days Past Due                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Loans   20,754,000       20,754,000   15,567,000    
Increase (decrease) in past due loans           5,200,000        
60-89 Days Past Due | Commercial and industrial loans                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Loans   3,545,000       3,545,000   1,160,000    
60-89 Days Past Due | Construction                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Loans   0       0   0    
60-89 Days Past Due | Commercial real estate, owner occupied                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Loans   5,849,000       5,849,000   2,880,000    
60-89 Days Past Due | Home equity                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Loans   3,443,000       3,443,000   1,427,000    
60-89 Days Past Due | Commercial real estate, non-owner occupied                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Loans   0       0   345,000    
60-89 Days Past Due | Residential                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Loans   7,687,000       7,687,000   9,536,000    
90 Days or More Past Due                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Loans   78,660,000       78,660,000   61,576,000    
Increase (decrease) in past due loans           17,100,000        
90 Days or More Past Due | Commercial and industrial loans                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Loans   16,641,000       16,641,000   10,086,000    
Increase (decrease) in past due loans           6,600,000        
90 Days or More Past Due | Construction                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Loans   13,346,000       13,346,000   23,776,000    
Increase (decrease) in past due loans           (10,400,000)        
90 Days or More Past Due | Commercial real estate, owner occupied                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Loans   6,402,000       6,402,000   2,477,000    
90 Days or More Past Due | Home equity                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Loans   5,237,000       5,237,000   3,476,000    
90 Days or More Past Due | Commercial real estate, non-owner occupied                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Loans   9,929,000       9,929,000   572,000    
Increase (decrease) in past due loans           9,400,000        
90 Days or More Past Due | Residential                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Loans   $ 26,915,000       26,915,000   $ 20,955,000    
Increase (decrease) in past due loans           $ 6,000,000.0