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Loans and Leases - Schedule of loan and lease balances for the originated and acquired portfolios (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Balance $ 18,241,907 $ 9,779,288
Weighted Average Coupon 5.95% 5.91%
Commercial real estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Balance $ 7,322,006 $ 4,027,265
Multi-family mortgage    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Balance 2,130,337 1,387,796
Construction    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Balance 759,729 301,053
Commercial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Balance 2,729,664 1,211,714
Equipment financing    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Balance 1,204,048 1,294,950
Residential mortgage    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Balance 3,278,048 1,114,732
Home equity    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Balance 650,746 377,411
Other consumer    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Balance 167,329 64,367
Commercial real estate loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Balance $ 10,212,072 $ 5,716,114
Weighted Average Coupon 5.77% 5.40%
Commercial real estate loans | Commercial real estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Balance $ 7,322,006 $ 4,027,265
Weighted Average Coupon 5.74% 5.40%
Commercial real estate loans | Multi-family mortgage    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Balance $ 2,130,337 $ 1,387,796
Weighted Average Coupon 5.42% 5.06%
Commercial real estate loans | Construction    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Balance $ 759,729 $ 301,053
Weighted Average Coupon 7.08% 7.00%
Commercial loans and leases    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Balance $ 3,933,712 $ 2,506,664
Weighted Average Coupon 7.22% 7.40%
Commercial loans and leases | Commercial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Balance $ 2,729,664 $ 1,211,714
Weighted Average Coupon 6.66% 6.47%
Commercial loans and leases | Equipment financing    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Balance $ 1,204,048 $ 1,294,950
Weighted Average Coupon 8.50% 8.27%
Consumer loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Balance $ 4,096,123 $ 1,556,510
Weighted Average Coupon 5.17% 5.38%
Consumer loans | Residential mortgage    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Balance $ 3,278,048 $ 1,114,732
Weighted Average Coupon 4.81% 4.69%
Consumer loans | Home equity    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Balance $ 650,746 $ 377,411
Weighted Average Coupon 6.91% 7.18%
Consumer loans | Other consumer    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Balance $ 167,329 $ 64,367
Weighted Average Coupon 5.52% 6.67%