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Fair Value Measurements Details of Book Value and Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]    
AFS, at estimated fair value $ 2,642,389 $ 2,646,767
Debt Securities, Held-to-Maturity, Fair Value 1,125,027 1,125,049
Reported Value Measurement [Member]    
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]    
Cash and due from banks 566,753 681,921
FRB and FHLB stock 107,605 130,186
Loans held for sale 6,507 7,264
AFS, at estimated fair value 2,642,389 2,646,767
Debt Securities, Held-to-Maturity, Fair Value 1,307,712 1,321,256
Net Loans 20,391,493 20,010,181
Accrued interest receivable 90,267 91,579
Other financial assets 619,022 642,049
Demand and savings deposits 18,461,527 18,851,912
Brokered deposits 960,919 208,416
Time deposits 1,894,138 1,589,210
Accrued interest payable 11,892 10,185
Federal funds purchased 525,000 191,000
Federal Home Loan Bank advances 747,000 1,250,000
Senior debt and subordinated debt 539,814 539,634
Other borrowings 634,956 890,573
Other financial liabilities 409,353 467,705
Estimate of Fair Value Measurement [Member]    
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]    
Cash and due from banks 566,753 681,921
FRB and FHLB stock 107,605 130,186
Loans held for sale 6,507 7,264
AFS, at estimated fair value 2,642,389 2,646,767
Debt Securities, Held-to-Maturity, Fair Value 1,125,027 1,125,049
Net Loans 19,132,951 18,862,701
Accrued interest receivable 90,267 91,579
Other financial assets 619,022 642,049
Demand and savings deposits 18,461,527 18,851,912
Brokered deposits 959,771 213,501
Time deposits 1,858,982 1,574,747
Accrued interest payable 11,892 10,185
Federal funds purchased 525,000 190,998
Federal Home Loan Bank advances 747,000 1,249,629
Senior debt and subordinated debt 468,896 456,867
Other borrowings 634,910 890,573
Other financial liabilities 409,353 467,705
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 566,753 681,921
FRB and FHLB stock 0 0
Loans held for sale 0 0
AFS, at estimated fair value 220,053 218,485
Debt Securities, Held-to-Maturity, Fair Value 0 0
Net Loans 0 0
Accrued interest receivable 90,267 91,579
Other financial assets 426,173 419,419
Demand and savings deposits 18,461,527 18,851,912
Brokered deposits 161,395 188,416
Time deposits 0 0
Accrued interest payable 11,892 10,185
Federal funds purchased 525,000 190,998
Federal Home Loan Bank advances 747,000 1,249,629
Senior debt and subordinated debt 0 0
Other borrowings 633,815 889,393
Other financial liabilities 160,740 154,912
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 107,605 130,186
Loans held for sale 6,507 7,264
AFS, at estimated fair value 2,422,336 2,428,282
Debt Securities, Held-to-Maturity, Fair Value 1,125,027 1,125,049
Net Loans 0 0
Accrued interest receivable 0 0
Other financial assets 142,322 166,796
Demand and savings deposits 0 0
Brokered deposits 798,376 25,085
Time deposits 1,858,982 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 468,896 456,867
Other borrowings 1,095 1,180
Other financial liabilities 231,074 296,465
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 19,132,951 18,862,701
Accrued interest receivable 0 0
Other financial assets 50,527 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 $ 17,539 $ 16,328