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Fair Value Measurements Details of Book Value and Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]    
AFS, at estimated fair value $ 3,594,076 $ 3,410,899
Debt Securities, Held-to-Maturity, Fair Value 1,285,350 1,183,449
Reported Value Measurement [Member]    
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]    
Cash and due from banks 814,197 1,063,871
FRB and FHLB stock 136,181 139,574
Loans held for sale 19,875 25,618
AFS, at estimated fair value 3,594,076 3,410,899
Debt Securities, Held-to-Maturity, Fair Value 1,451,194 1,395,569
Net Loans 23,665,231 23,665,763
Accrued interest receivable 114,003 117,029
Other financial assets 723,378 736,502
Demand and savings deposits 21,589,281 21,135,478
Brokered deposits 709,667 843,857
Time deposits 4,033,542 4,150,098
Accrued interest payable 22,583 31,620
FHLB advances 450,000 850,000
Senior debt and subordinated debt 367,557 367,316
Other borrowings 654,404 564,732
Other financial liabilities 394,603 467,011
Estimate of Fair Value Measurement [Member]    
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]    
Cash and due from banks 814,197 1,063,871
FRB and FHLB stock 136,181 139,574
Loans held for sale 19,875 25,618
AFS, at estimated fair value 3,594,076 3,410,899
Debt Securities, Held-to-Maturity, Fair Value 1,285,350 1,183,449
Net Loans 22,658,165 22,555,687
Accrued interest receivable 114,003 117,029
Other financial assets 744,189 762,903
Demand and savings deposits 21,589,281 21,135,478
Brokered deposits 709,746 843,703
Time deposits 4,029,096 4,154,726
Accrued interest payable 22,583 31,620
FHLB advances 452,489 851,470
Senior debt and subordinated debt 357,016 253,818
Other borrowings 636,702 545,809
Other financial liabilities 394,604 467,011
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member]    
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]    
Cash and due from banks 814,197 1,063,871
FRB and FHLB stock 0 0
Loans held for sale 0 0
AFS, at estimated fair value 0 0
Debt Securities, Held-to-Maturity, Fair Value 0 0
Net Loans 0 0
Accrued interest receivable 114,003 117,029
Other financial assets 556,827 543,251
Demand and savings deposits 21,589,281 21,135,478
Brokered deposits 73,980 145,056
Time deposits 0 0
Accrued interest payable 22,583 31,620
FHLB advances 452,489 851,470
Senior debt and subordinated debt 0 0
Other borrowings 635,717 544,908
Other financial liabilities 202,396 200,029
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member]    
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]    
Cash and due from banks 0 0
FRB and FHLB stock 136,181 139,574
Loans held for sale 19,875 25,618
AFS, at estimated fair value 3,594,076 3,410,899
Debt Securities, Held-to-Maturity, Fair Value 1,285,350 1,183,449
Net Loans 0 0
Accrued interest receivable 0 0
Other financial assets 131,831 159,939
Demand and savings deposits 0 0
Brokered deposits 635,766 698,647
Time deposits 4,029,096 4,154,726
Accrued interest payable 0 0
FHLB advances 0 0
Senior debt and subordinated debt 357,016 253,818
Other borrowings 985 901
Other financial liabilities 177,633 252,821
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member]    
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]    
Cash and due from banks 0 0
FRB and FHLB stock 0 0
Loans held for sale 0 0
AFS, at estimated fair value 0 0
Debt Securities, Held-to-Maturity, Fair Value 0 0
Net Loans 22,658,165 22,555,687
Accrued interest receivable 0 0
Other financial assets 55,531 59,713
Demand and savings deposits 0 0
Brokered deposits 0 0
Time deposits 0 0
Accrued interest payable 0 0
FHLB advances 0 0
Senior debt and subordinated debt 0 0
Other borrowings 0 0
Other financial liabilities $ 14,575 $ 14,161