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Fair Value Measurements Details of Book Value and Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]    
AFS, at estimated fair value $ 3,619,869 $ 3,410,899
Debt Securities, Held-to-Maturity, Fair Value 1,293,001 1,183,449
Reported Value Measurement [Member]    
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]    
Cash and due from banks 804,664 1,063,871
FRB and FHLB stock 141,515 139,574
Loans held for sale 23,281 25,618
AFS, at estimated fair value 3,619,869 3,410,899
Debt Securities, Held-to-Maturity, Fair Value 1,473,158 1,395,569
Net Loans 23,635,202 23,665,763
Accrued interest receivable 117,130 117,029
Other financial assets 723,223 736,502
Demand and savings deposits 21,202,779 21,135,478
Brokered deposits 817,398 843,857
Time deposits 4,117,890 4,150,098
Accrued interest payable 27,570 31,620
FHLB advances 800,000 850,000
Senior debt and subordinated debt 367,476 367,316
Other borrowings 606,424 564,732
Other financial liabilities 400,592 467,011
Estimate of Fair Value Measurement [Member]    
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]    
Cash and due from banks 804,664 1,063,871
FRB and FHLB stock 141,515 139,574
Loans held for sale 23,281 25,618
AFS, at estimated fair value 3,619,869 3,410,899
Debt Securities, Held-to-Maturity, Fair Value 1,293,001 1,183,449
Net Loans 22,484,657 22,555,687
Accrued interest receivable 117,130 117,029
Other financial assets 744,718 762,903
Demand and savings deposits 21,202,779 21,135,478
Brokered deposits 817,125 843,703
Time deposits 4,114,313 4,154,726
Accrued interest payable 27,570 31,620
FHLB advances 800,220 851,470
Senior debt and subordinated debt 357,807 253,818
Other borrowings 587,569 545,809
Other financial liabilities 400,592 467,011
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 804,664 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 117,130 117,029
Other financial assets 549,574 543,251
Demand and savings deposits 21,202,779 21,135,478
Brokered deposits 80,212 145,056
Time deposits 0 0
Accrued interest payable 27,570 31,620
FHLB advances 800,220 851,470
Senior debt and subordinated debt 0 0
Other borrowings 586,483 544,908
Other financial liabilities 196,916 200,029
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 141,515 139,574
Loans held for sale 23,281 25,618
AFS, at estimated fair value 3,619,869 3,410,899
Debt Securities, Held-to-Maturity, Fair Value 1,293,001 1,183,449
Net Loans 0 0
Accrued interest receivable 0 0
Other financial assets 138,008 159,939
Demand and savings deposits 0 0
Brokered deposits 736,913 698,647
Time deposits 4,114,313 4,154,726
Accrued interest payable 0 0
FHLB advances 0 0
Senior debt and subordinated debt 357,807 253,818
Other borrowings 1,086 901
Other financial liabilities 189,496 252,821
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 22,484,657 22,555,687
Accrued interest receivable 0 0
Other financial assets 57,136 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 $ 14,180 $ 14,161