v3.26.1
ALLOWANCE FOR CREDIT LOSSES AND CREDIT QUALITY INFORMATION - Schedule of Nonaccrual and Past Due Loans (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Jun. 30, 2025
Financing Receivable, Past Due [Line Items]      
Nonaccrual Loans With No Allowance $ 62,836 $ 56,245  
Nonaccrual Loans With An Allowance 5,435 15,653  
Total Loans $ 13,463,117 $ 13,257,946 $ 12,989,546
Percent of nonaccrual loans with no allowance 0.47% 0.42%  
Percent of nonaccrual loans with an allowance 0.04% 0.12%  
% of Total Loans 100.00% 100.00%  
Reverse mortgage, fair value $ 4,000 $ 3,700 4,700
Total Past Due And Still Accruing      
Financing Receivable, Past Due [Line Items]      
Gross loans $ 36,730 $ 101,163  
Percent past due 0.27% 0.76%  
30–89 Days Past Due and Still  Accruing      
Financing Receivable, Past Due [Line Items]      
Gross loans $ 28,618 $ 78,747  
Percent past due 0.21% 0.59%  
Greater  Than 90 Days Past Due and Still Accruing      
Financing Receivable, Past Due [Line Items]      
Gross loans $ 8,112 $ 22,416  
Percent past due 0.06% 0.17%  
Accruing Current Balances      
Financing Receivable, Past Due [Line Items]      
Gross loans $ 13,358,116 $ 13,084,885  
Percent of accruing current balances 99.22% 98.70%  
Commercial | Commercial and Industrial      
Financing Receivable, Past Due [Line Items]      
Gross loans $ 3,013,715 $ 2,796,654  
Nonaccrual Loans With No Allowance 19,847 16,842  
Nonaccrual Loans With An Allowance 0 10,218  
Total Loans 3,013,715 2,796,654 2,744,392
Commercial | Commercial and Industrial | Total Past Due And Still Accruing      
Financing Receivable, Past Due [Line Items]      
Gross loans 5,249 6,696  
Commercial | Commercial and Industrial | 30–89 Days Past Due and Still  Accruing      
Financing Receivable, Past Due [Line Items]      
Gross loans 4,967 4,634  
Commercial | Commercial and Industrial | Greater  Than 90 Days Past Due and Still Accruing      
Financing Receivable, Past Due [Line Items]      
Gross loans 282 2,062  
Commercial | Commercial and Industrial | Accruing Current Balances      
Financing Receivable, Past Due [Line Items]      
Gross loans 2,988,619 2,762,898  
Commercial | Owner-occupied commercial      
Financing Receivable, Past Due [Line Items]      
Gross loans 1,930,367 1,937,339  
Nonaccrual Loans With No Allowance 20,343 6,581  
Nonaccrual Loans With An Allowance 0 0  
Total Loans 1,930,367 1,937,339 1,947,594
Commercial | Owner-occupied commercial | Total Past Due And Still Accruing      
Financing Receivable, Past Due [Line Items]      
Gross loans 3,119 7,202  
Commercial | Owner-occupied commercial | 30–89 Days Past Due and Still  Accruing      
Financing Receivable, Past Due [Line Items]      
Gross loans 3,118 7,152  
Commercial | Owner-occupied commercial | Greater  Than 90 Days Past Due and Still Accruing      
Financing Receivable, Past Due [Line Items]      
Gross loans 1 50  
Commercial | Owner-occupied commercial | Accruing Current Balances      
Financing Receivable, Past Due [Line Items]      
Gross loans 1,906,905 1,923,556  
Commercial | Commercial mortgages      
Financing Receivable, Past Due [Line Items]      
Gross loans 3,883,849 3,916,159  
Nonaccrual Loans With No Allowance 11,522 7,565  
Nonaccrual Loans With An Allowance 0 0  
Total Loans 3,883,849 3,916,159 3,911,537
Commercial | Commercial mortgages | Total Past Due And Still Accruing      
Financing Receivable, Past Due [Line Items]      
Gross loans 2,624 53,672  
Commercial | Commercial mortgages | 30–89 Days Past Due and Still  Accruing      
Financing Receivable, Past Due [Line Items]      
Gross loans 2,412 44,139  
Commercial | Commercial mortgages | Greater  Than 90 Days Past Due and Still Accruing      
Financing Receivable, Past Due [Line Items]      
Gross loans 212 9,533  
Commercial | Commercial mortgages | Accruing Current Balances      
Financing Receivable, Past Due [Line Items]      
Gross loans 3,869,703 3,854,922  
Commercial | Construction      
Financing Receivable, Past Due [Line Items]      
Gross loans 1,002,999 1,023,911  
Nonaccrual Loans With No Allowance 2,504 16,946  
Nonaccrual Loans With An Allowance 5,435 5,435  
Total Loans 1,002,999 1,023,911 857,631
Commercial | Construction | Total Past Due And Still Accruing      
Financing Receivable, Past Due [Line Items]      
Gross loans 67 1,716  
Commercial | Construction | 30–89 Days Past Due and Still  Accruing      
Financing Receivable, Past Due [Line Items]      
Gross loans 67 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 994,993 999,814  
Commercial | Commercial Small Business Leases      
Financing Receivable, Past Due [Line Items]      
Gross loans 584,175 603,321  
Nonaccrual Loans With No Allowance 0 0  
Nonaccrual Loans With An Allowance 0 0  
Total Loans 584,175 603,321 630,127
Commercial | Commercial Small Business Leases | Total Past Due And Still Accruing      
Financing Receivable, Past Due [Line Items]      
Gross loans 6,737 7,128  
Commercial | Commercial Small Business Leases | 30–89 Days Past Due and Still  Accruing      
Financing Receivable, Past Due [Line Items]      
Gross loans 6,726 6,536  
Commercial | Commercial Small Business Leases | Greater  Than 90 Days Past Due and Still Accruing      
Financing Receivable, Past Due [Line Items]      
Gross loans 11 592  
Commercial | Commercial Small Business Leases | Accruing Current Balances      
Financing Receivable, Past Due [Line Items]      
Gross loans 577,438 596,193  
Residential      
Financing Receivable, Past Due [Line Items]      
Gross loans 1,236,779 1,089,830  
Nonaccrual Loans With No Allowance 5,114 5,002  
Nonaccrual Loans With An Allowance 0 0  
Total Loans 1,232,774 1,086,102 976,462
Residential | Total Past Due And Still Accruing      
Financing Receivable, Past Due [Line Items]      
Gross loans 3,077 3,984  
Residential | 30–89 Days Past Due and Still  Accruing      
Financing Receivable, Past Due [Line Items]      
Gross loans 3,077 3,851  
Residential | Greater  Than 90 Days Past Due and Still Accruing      
Financing Receivable, Past Due [Line Items]      
Gross loans 0 133  
Residential | Accruing Current Balances      
Financing Receivable, Past Due [Line Items]      
Gross loans 1,224,583 1,077,116  
Consumer(3)      
Financing Receivable, Past Due [Line Items]      
Gross loans 1,815,238 1,894,460  
Nonaccrual Loans With No Allowance 3,506 3,309  
Nonaccrual Loans With An Allowance 0 0  
Total Loans 1,815,238 1,894,460 $ 1,921,803
Consumer(3) | Total Past Due And Still Accruing      
Financing Receivable, Past Due [Line Items]      
Gross loans 15,857 20,765  
Consumer(3) | 30–89 Days Past Due and Still  Accruing      
Financing Receivable, Past Due [Line Items]      
Gross loans 8,251 10,719  
Consumer(3) | Greater  Than 90 Days Past Due and Still Accruing      
Financing Receivable, Past Due [Line Items]      
Gross loans 7,606 10,046  
Consumer(3) | Accruing Current Balances      
Financing Receivable, Past Due [Line Items]      
Gross loans 1,795,875 1,870,386  
Consumer(3) | Student loans | Total Past Due And Still Accruing      
Financing Receivable, Past Due [Line Items]      
Gross loans $ 11,200 $ 15,200