v3.26.3
ALLOWANCE FOR CREDIT LOSSES AND CREDIT QUALITY INFORMATION - Schedule of Nonaccrual and Past Due Loans (Details) - USD ($)
$ in Thousands
Sep. 30, 2026
Dec. 31, 2025
Sep. 30, 2025
Financing Receivable, Past Due [Line Items]      
Nonaccrual Loans With No Allowance $ 45,221 $ 56,245  
Nonaccrual Loans With An Allowance 25,589 15,653  
Total Loans $ 13,638,712 $ 13,257,946 $ 12,955,253
Percent of nonaccrual loans with no allowance 0.33% 0.42%  
Percent of nonaccrual loans with an allowance 0.19% 0.12%  
% of Total Loans 100.00% 100.00%  
Reverse mortgage, fair value $ 3,500 $ 3,700 5,300
Total Past Due And Still Accruing      
Financing Receivable, Past Due [Line Items]      
Gross loans $ 48,284 $ 101,163  
Percent past due 0.35% 0.76%  
30–89 Days Past Due and Still  Accruing      
Financing Receivable, Past Due [Line Items]      
Gross loans $ 32,566 $ 78,747  
Percent past due 0.24% 0.59%  
Greater  Than 90 Days Past Due and Still Accruing      
Financing Receivable, Past Due [Line Items]      
Gross loans $ 15,718 $ 22,416  
Percent past due 0.12% 0.17%  
Accruing Current Balances      
Financing Receivable, Past Due [Line Items]      
Gross loans $ 13,519,618 $ 13,084,885  
Percent of accruing current balances 99.13% 98.70%  
Commercial | Commercial and Industrial      
Financing Receivable, Past Due [Line Items]      
Gross loans $ 2,975,080 $ 2,796,654  
Nonaccrual Loans With No Allowance 9,620 16,842  
Nonaccrual Loans With An Allowance 20,154 10,218  
Total Loans 2,975,080 2,796,654 2,625,152
Commercial | Commercial and Industrial | Total Past Due And Still Accruing      
Financing Receivable, Past Due [Line Items]      
Gross loans 6,362 6,696  
Commercial | Commercial and Industrial | 30–89 Days Past Due and Still  Accruing      
Financing Receivable, Past Due [Line Items]      
Gross loans 4,446 4,634  
Commercial | Commercial and Industrial | Greater  Than 90 Days Past Due and Still Accruing      
Financing Receivable, Past Due [Line Items]      
Gross loans 1,916 2,062  
Commercial | Commercial and Industrial | Accruing Current Balances      
Financing Receivable, Past Due [Line Items]      
Gross loans 2,938,944 2,762,898  
Commercial | Owner-occupied commercial      
Financing Receivable, Past Due [Line Items]      
Gross loans 2,040,299 1,937,339  
Nonaccrual Loans With No Allowance 19,897 6,581  
Nonaccrual Loans With An Allowance 0 0  
Total Loans 2,040,299 1,937,339 1,922,767
Commercial | Owner-occupied commercial | Total Past Due And Still Accruing      
Financing Receivable, Past Due [Line Items]      
Gross loans 7,954 7,202  
Commercial | Owner-occupied commercial | 30–89 Days Past Due and Still  Accruing      
Financing Receivable, Past Due [Line Items]      
Gross loans 3,294 7,152  
Commercial | Owner-occupied commercial | Greater  Than 90 Days Past Due and Still Accruing      
Financing Receivable, Past Due [Line Items]      
Gross loans 4,660 50  
Commercial | Owner-occupied commercial | Accruing Current Balances      
Financing Receivable, Past Due [Line Items]      
Gross loans 2,012,448 1,923,556  
Commercial | Commercial mortgages      
Financing Receivable, Past Due [Line Items]      
Gross loans 3,884,727 3,916,159  
Nonaccrual Loans With No Allowance 5,287 7,565  
Nonaccrual Loans With An Allowance 0 0  
Total Loans 3,884,727 3,916,159 3,855,971
Commercial | Commercial mortgages | Total Past Due And Still Accruing      
Financing Receivable, Past Due [Line Items]      
Gross loans 7,292 53,672  
Commercial | Commercial mortgages | 30–89 Days Past Due and Still  Accruing      
Financing Receivable, Past Due [Line Items]      
Gross loans 7,292 44,139  
Commercial | Commercial mortgages | Greater  Than 90 Days Past Due and Still Accruing      
Financing Receivable, Past Due [Line Items]      
Gross loans 0 9,533  
Commercial | Commercial mortgages | Accruing Current Balances      
Financing Receivable, Past Due [Line Items]      
Gross loans 3,872,148 3,854,922  
Commercial | Construction      
Financing Receivable, Past Due [Line Items]      
Gross loans 1,004,871 1,023,911  
Nonaccrual Loans With No Allowance 1,808 16,946  
Nonaccrual Loans With An Allowance 5,435 5,435  
Total Loans 1,004,871 1,023,911 1,003,986
Commercial | Construction | Total Past Due And Still Accruing      
Financing Receivable, Past Due [Line Items]      
Gross loans 0 1,716  
Commercial | Construction | 30–89 Days Past Due and Still  Accruing      
Financing Receivable, Past Due [Line Items]      
Gross loans 0 1,716  
Commercial | Construction | Greater  Than 90 Days Past Due and Still Accruing      
Financing Receivable, Past Due [Line Items]      
Gross loans 0 0  
Commercial | Construction | Accruing Current Balances      
Financing Receivable, Past Due [Line Items]      
Gross loans 997,628 999,814  
Commercial | Commercial Small Business Leases      
Financing Receivable, Past Due [Line Items]      
Gross loans 593,112 603,321  
Nonaccrual Loans With No Allowance 0 0  
Nonaccrual Loans With An Allowance 0 0  
Total Loans 593,112 603,321 617,256
Commercial | Commercial Small Business Leases | Total Past Due And Still Accruing      
Financing Receivable, Past Due [Line Items]      
Gross loans 5,948 7,128  
Commercial | Commercial Small Business Leases | 30–89 Days Past Due and Still  Accruing      
Financing Receivable, Past Due [Line Items]      
Gross loans 5,098 6,536  
Commercial | Commercial Small Business Leases | Greater  Than 90 Days Past Due and Still Accruing      
Financing Receivable, Past Due [Line Items]      
Gross loans 850 592  
Commercial | Commercial Small Business Leases | Accruing Current Balances      
Financing Receivable, Past Due [Line Items]      
Gross loans 587,164 596,193  
Residential      
Financing Receivable, Past Due [Line Items]      
Gross loans 1,331,351 1,089,830  
Nonaccrual Loans With No Allowance 5,109 5,002  
Nonaccrual Loans With An Allowance 0 0  
Total Loans 1,327,823 1,086,102 1,033,343
Residential | Total Past Due And Still Accruing      
Financing Receivable, Past Due [Line Items]      
Gross loans 3,560 3,984  
Residential | 30–89 Days Past Due and Still  Accruing      
Financing Receivable, Past Due [Line Items]      
Gross loans 3,300 3,851  
Residential | Greater  Than 90 Days Past Due and Still Accruing      
Financing Receivable, Past Due [Line Items]      
Gross loans 260 133  
Residential | Accruing Current Balances      
Financing Receivable, Past Due [Line Items]      
Gross loans 1,319,154 1,077,116  
Consumer      
Financing Receivable, Past Due [Line Items]      
Gross loans 1,812,800 1,894,460  
Nonaccrual Loans With No Allowance 3,500 3,309  
Nonaccrual Loans With An Allowance 0 0  
Total Loans 1,812,800 1,894,460 $ 1,896,778
Consumer | Total Past Due And Still Accruing      
Financing Receivable, Past Due [Line Items]      
Gross loans 17,168 20,765  
Consumer | 30–89 Days Past Due and Still  Accruing      
Financing Receivable, Past Due [Line Items]      
Gross loans 9,136 10,719  
Consumer | Greater  Than 90 Days Past Due and Still Accruing      
Financing Receivable, Past Due [Line Items]      
Gross loans 8,032 10,046  
Consumer | Accruing Current Balances      
Financing Receivable, Past Due [Line Items]      
Gross loans 1,792,132 1,870,386  
Consumer | Student loans | Total Past Due And Still Accruing      
Financing Receivable, Past Due [Line Items]      
Gross loans $ 11,900 $ 15,200