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Fair Value Measurements Details of Book Value and Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]    
AFS, at estimated fair value $ 2,597,384 $ 3,187,390
Debt Securities, Held-to-Maturity, Fair Value 1,141,710 965,867
Reported Value Measurement [Member]    
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]    
Cash and due from banks 528,715 1,638,614
FRB and FHLB stock 81,914 57,635
Loans held for sale 14,411 35,768
AFS, at estimated fair value 2,597,384 3,187,390
Debt Securities, Held-to-Maturity, Fair Value 1,339,310 980,384
Net Loans 19,428,361 18,076,349
Accrued interest receivable 72,821 57,451
Other financial assets 653,358 565,491
Demand and savings deposits 19,612,499 19,594,497
Brokered deposits 226,883 251,526
Time deposits 1,537,172 1,727,476
Accrued interest payable 5,739 7,000
Federal funds purchased 136,000  
Federal Home Loan Bank advances 265,500  
Senior debt and subordinated debt 539,461 620,406
Other borrowings 483,720 417,703
Other financial liabilities 500,827 288,862
Estimate of Fair Value Measurement [Member]    
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]    
Cash and due from banks 528,715 1,638,614
FRB and FHLB stock 81,914 57,635
Loans held for sale 14,411 35,768
AFS, at estimated fair value 2,597,384 3,187,390
Debt Securities, Held-to-Maturity, Fair Value 1,141,710 965,867
Net Loans 18,817,452 17,519,497
Accrued interest receivable 72,821 57,451
Other financial assets 653,358 565,491
Demand and savings deposits 19,612,499 19,594,497
Brokered deposits 233,099 252,129
Time deposits 1,521,484 1,730,673
Accrued interest payable 5,739 7,000
Federal funds purchased 136,000  
Federal Home Loan Bank advances 265,500  
Senior debt and subordinated debt 455,833 604,780
Other borrowings 483,712 417,703
Other financial liabilities 500,827 288,862
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 528,715 1,638,614
FRB and FHLB stock 0 0
Loans held for sale 0 0
AFS, at estimated fair value 218,184 127,618
Debt Securities, Held-to-Maturity, Fair Value 0 0
Net Loans 0 0
Accrued interest receivable 72,821 57,451
Other financial assets 417,360 367,336
Demand and savings deposits 19,612,499 19,594,497
Brokered deposits 206,883 231,526
Time deposits 0 0
Accrued interest payable 5,739 7,000
Federal funds purchased 136,000  
Federal Home Loan Bank advances 265,500  
Senior debt and subordinated debt 0 0
Other borrowings 482,449 416,764
Other financial liabilities 170,315 188,219
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 81,914 57,635
Loans held for sale 14,411 35,768
AFS, at estimated fair value 2,379,200 2,985,105
Debt Securities, Held-to-Maturity, Fair Value 1,141,710 965,867
Net Loans 0 0
Accrued interest receivable 0 0
Other financial assets 179,049 160,945
Demand and savings deposits 0 0
Brokered deposits 26,216 20,603
Time deposits 1,521,484 1,730,673
Accrued interest payable 0 0
Federal funds purchased 0  
Federal Home Loan Bank advances 0  
Senior debt and subordinated debt 455,833 604,780
Other borrowings 1,263 939
Other financial liabilities 314,438 86,110
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 74,667
Debt Securities, Held-to-Maturity, Fair Value 0 0
Net Loans 18,817,452 17,519,497
Accrued interest receivable 0 0
Other financial assets 56,949 37,210
Demand and savings deposits 0 0
Brokered deposits 0 0
Time deposits 0 0
Accrued interest payable 0 0
Federal Home Loan Bank advances 0  
Senior debt and subordinated debt 0 0
Other borrowings 0 0
Other financial liabilities $ 16,074 $ 14,533