v3.26.3
Commitments, Off-Balance Sheet Arrangements, Legal Proceedings and Regulatory Matters, Summary of Lending Related and Other Commitments (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
Other Commitments [Line Items]          
Lending Related Commitments, Fair Value $ 0   $ 0   $ 0
Loans Repurchased Under Make Whole Requests     4,300   3,500
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount 49,744   49,744   41,276
Investment Program, Proportional Amortization Method, Elected [Line Items]          
Investment Program, Proportional Amortization Method, Elected, Income Tax Credit 9,046 $ 9,468 28,589 $ 29,698  
Commitments to Extend Credit [Member]          
Other Commitments [Line Items]          
Lending Related Commitments 13,640,398   13,640,398   11,872,816
Letter of Credit [Member]          
Other Commitments [Line Items]          
Lending Related Commitments 430   430   425
Standby Letters of Credit [Member]          
Other Commitments [Line Items]          
Lending Related Commitments 255,660   255,660   222,047
Lines of Credit, Fair Value Disclosure 2,400   2,400   $ 2,200
Affordable Housing Projects and Other [Member]          
Other Commitments [Line Items]          
Investment Program, Proportional Amortization Method, Applied, Amortization Expense 8,476 9,249 25,623 26,307  
Investment Program, Proportional Amortization Method, Elected [Line Items]          
Investment Program, Proportional Amortization Method, Applied, Amortization Expense $ 8,476 $ 9,249 $ 25,623 $ 26,307