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Fair Value Measurements Details of Book Value and Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]    
AFS, at estimated fair value $ 3,575,043 $ 3,410,899
Debt Securities, Held-to-Maturity, Fair Value 1,309,834 1,183,449
Reported Value Measurement [Member]    
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]    
Cash and due from banks 1,030,456 1,063,871
FRB and FHLB stock 136,164 139,574
Loans held for sale 15,965 25,618
AFS, at estimated fair value 3,575,043 3,410,899
Debt Securities, Held-to-Maturity, Fair Value 1,496,280 1,395,569
Net Loans 23,482,897 23,665,763
Accrued interest receivable 116,215 117,029
Other financial assets 721,350 736,502
Demand and savings deposits 21,448,848 21,135,478
Brokered deposits 738,458 843,857
Time deposits 4,141,666 4,150,098
Accrued interest payable 27,014 31,620
FHLB advances 750,000 850,000
Senior debt and subordinated debt 367,396 367,316
Other borrowings 539,804 564,732
Other financial liabilities 430,949 467,011
Estimate of Fair Value Measurement [Member]    
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]    
Cash and due from banks 1,030,456 1,063,871
FRB and FHLB stock 136,164 139,574
Loans held for sale 15,965 25,618
AFS, at estimated fair value 3,575,043 3,410,899
Debt Securities, Held-to-Maturity, Fair Value 1,309,834 1,183,449
Net Loans 22,148,322 22,555,687
Accrued interest receivable 116,215 117,029
Other financial assets 742,532 762,903
Demand and savings deposits 21,448,848 21,135,478
Brokered deposits 738,181 843,703
Time deposits 4,138,508 4,154,726
Accrued interest payable 27,014 31,620
FHLB advances 750,725 851,470
Senior debt and subordinated debt 355,739 253,818
Other borrowings 522,177 545,809
Other financial liabilities 430,970 467,011
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 1,030,456 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 116,215 117,029
Other financial assets 545,629 543,251
Demand and savings deposits 21,448,848 21,135,478
Brokered deposits 141,084 145,056
Time deposits 0 0
Accrued interest payable 27,014 31,620
FHLB advances 750,725 851,470
Senior debt and subordinated debt 0 0
Other borrowings 520,975 544,908
Other financial liabilities 206,158 200,029
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 136,164 139,574
Loans held for sale 15,965 25,618
AFS, at estimated fair value 3,575,043 3,410,899
Debt Securities, Held-to-Maturity, Fair Value 1,309,834 1,183,449
Net Loans 0 0
Accrued interest receivable 0 0
Other financial assets 140,313 159,939
Demand and savings deposits 0 0
Brokered deposits 597,097 698,647
Time deposits 4,138,508 4,154,726
Accrued interest payable 0 0
FHLB advances 0 0
Senior debt and subordinated debt 355,739 253,818
Other borrowings 1,202 901
Other financial liabilities 209,865 252,821
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 22,148,322 22,555,687
Accrued interest receivable 0 0
Other financial assets 56,590 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 $ 14,947 $ 14,161