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Fair Value Measurements Details of Book Value and Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]    
AFS, at estimated fair value $ 2,418,868 $ 2,646,767
Debt Securities, Held-to-Maturity, Fair Value 1,019,844 1,125,049
Reported Value Measurement [Member]    
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]    
Cash and due from banks 420,460 681,921
FRB and FHLB stock 106,363 130,186
Loans held for sale 20,368 7,264
AFS, at estimated fair value 2,418,868 2,646,767
Debt Securities, Held-to-Maturity, Fair Value 1,279,733 1,321,256
Net Loans 20,884,769 20,010,181
Accrued interest receivable 101,624 91,579
Other financial assets 734,736 642,049
Demand and savings deposits 18,040,590 18,851,912
Brokered deposits 941,059 208,416
Time deposits 2,439,940 1,589,210
Accrued interest payable 26,848 10,185
Federal funds purchased 544,000 191,000
Federal Home Loan Bank advances 730,000 1,250,000
Senior debt and subordinated debt 540,174 539,634
Other borrowings 555,938 890,573
Other financial liabilities 560,431 467,705
Estimate of Fair Value Measurement [Member]    
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]    
Cash and due from banks 420,460 681,921
FRB and FHLB stock 106,363 130,186
Loans held for sale 20,368 7,264
AFS, at estimated fair value 2,418,868 2,646,767
Debt Securities, Held-to-Maturity, Fair Value 1,019,844 1,125,049
Net Loans 19,508,510 18,862,701
Accrued interest receivable 101,624 91,579
Other financial assets 734,736 642,049
Demand and savings deposits 18,040,590 18,851,912
Brokered deposits 938,738 213,501
Time deposits 2,421,009 1,574,747
Accrued interest payable 26,848 10,185
Federal funds purchased 543,995 190,998
Federal Home Loan Bank advances 736,030 1,249,629
Senior debt and subordinated debt 449,078 456,867
Other borrowings 555,910 890,573
Other financial liabilities 560,431 467,705
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 420,460 681,921
FRB and FHLB stock 0 0
Loans held for sale 0 0
AFS, at estimated fair value 222,446 218,485
Debt Securities, Held-to-Maturity, Fair Value 0 0
Net Loans 0 0
Accrued interest receivable 101,624 91,579
Other financial assets 451,882 419,419
Demand and savings deposits 18,040,590 18,851,912
Brokered deposits 143,238 188,416
Time deposits 0 0
Accrued interest payable 26,848 10,185
Federal funds purchased 543,995 190,998
Federal Home Loan Bank advances 736,030 1,249,629
Senior debt and subordinated debt 0 0
Other borrowings 554,986 889,393
Other financial liabilities 171,792 154,912
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 106,363 130,186
Loans held for sale 20,368 7,264
AFS, at estimated fair value 2,196,422 2,428,282
Debt Securities, Held-to-Maturity, Fair Value 1,019,844 1,125,049
Net Loans 0 0
Accrued interest receivable 0 0
Other financial assets 228,782 166,796
Demand and savings deposits 0 0
Brokered deposits 795,500 25,085
Time deposits 2,421,009 1,574,747
Accrued interest payable 0 0
Federal funds purchased 0 0
Federal Home Loan Bank advances 0 0
Senior debt and subordinated debt 449,078 456,867
Other borrowings 924 1,180
Other financial liabilities 372,529 296,465
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 19,508,510 18,862,701
Accrued interest receivable 0 0
Other financial assets 54,072 55,834
Demand and savings deposits 0 0
Brokered deposits 0 0
Time deposits 0 0
Accrued interest payable 0 0
Federal funds purchased 0 0
Federal Home Loan Bank advances 0 0
Senior debt and subordinated debt 0 0
Other borrowings 0 0
Other financial liabilities $ 16,110 $ 16,328