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Fair Value Measurements Details of Book Value and Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]    
AFS, at estimated fair value $ 2,646,767 $ 3,187,390
Estimated Fair Value 1,125,049  
Carrying Amount    
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]    
Cash and cash equivalents 681,921 1,638,614
FRB and FHLB stock 130,186 57,635
Loans held for sale 7,264 35,768
AFS, at estimated fair value 1,321,256 980,384
Estimated Fair Value 2,646,767 3,187,390
Loans, net 20,010,181 18,076,349
Accrued interest receivable 91,579 57,451
Other assets 642,049 565,491
Demand and savings deposits 18,851,912 19,594,497
Brokered deposits 208,416 251,526
Time deposits 1,589,210 1,727,476
Accrued interest payable 10,185 7,000
Federal Funds Purchased, Fair Value Disclosure 191,000  
Federal Home Loan Bank Borrowings, Fair Value Disclosure 1,250,000  
Long-Term Debt, Fair Value 539,634 620,406
Other Borrowings, Fair Value Disclosure 890,573 417,703
Other liabilities 467,705 288,862
Estimate of Fair Value Measurement    
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]    
Cash and cash equivalents 681,921 1,638,614
FRB and FHLB stock 130,186 57,635
Loans held for sale 7,264 35,768
AFS, at estimated fair value 1,125,049 965,867
Estimated Fair Value 2,646,767 3,187,390
Loans, net 18,862,701 17,519,497
Accrued interest receivable 91,579 57,451
Other assets 642,049 565,491
Demand and savings deposits 18,851,912 19,594,497
Brokered deposits 213,501 252,129
Time deposits 1,574,747 1,730,673
Accrued interest payable 10,185 7,000
Federal Funds Purchased, Fair Value Disclosure 190,998  
Federal Home Loan Bank Borrowings, Fair Value Disclosure 1,249,629  
Long-Term Debt, Fair Value 456,867 604,780
Other Borrowings, Fair Value Disclosure 890,573 417,703
Other liabilities 467,705 288,862
Level 1 | Estimate of Fair Value Measurement    
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]    
Cash and cash equivalents 681,921 1,638,614
FRB and FHLB stock 0 0
Loans held for sale 0 0
AFS, at estimated fair value 0 0
Estimated Fair Value 218,485 127,618
Loans, net 0 0
Accrued interest receivable 91,579 57,451
Other assets 419,419 367,336
Demand and savings deposits 18,851,912 19,594,497
Brokered deposits 188,416 231,526
Time deposits 0 0
Accrued interest payable 10,185 7,000
Federal Funds Purchased, Fair Value Disclosure 190,998  
Federal Home Loan Bank Borrowings, Fair Value Disclosure 1,249,629  
Long-Term Debt, Fair Value 0 0
Other Borrowings, Fair Value Disclosure 889,393 416,764
Other liabilities 154,912 188,219
Level 2 | Estimate of Fair Value Measurement    
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]    
Cash and cash equivalents 0 0
FRB and FHLB stock 130,186 57,635
Loans held for sale 7,264 35,768
AFS, at estimated fair value 1,125,049 965,867
Estimated Fair Value 2,428,282 2,985,105
Loans, net 0 0
Accrued interest receivable 0 0
Other assets 166,796 160,945
Demand and savings deposits 0 0
Brokered deposits 25,085 20,603
Time deposits 1,574,747 1,730,673
Accrued interest payable 0 0
Federal Funds Purchased, Fair Value Disclosure 0  
Federal Home Loan Bank Borrowings, Fair Value Disclosure 0  
Long-Term Debt, Fair Value 456,867 604,780
Other Borrowings, Fair Value Disclosure 1,180 939
Other liabilities 296,465 86,110
Level 3 | Estimate of Fair Value Measurement    
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]    
Cash and cash equivalents 0 0
FRB and FHLB stock 0 0
Loans held for sale 0 0
AFS, at estimated fair value 0 0
Estimated Fair Value 0 74,667
Loans, net 18,862,701 17,519,497
Accrued interest receivable 0 0
Other assets 55,834 37,210
Demand and savings deposits 0 0
Brokered deposits 0 0
Time deposits 0 0
Accrued interest payable 0 0
Federal Funds Purchased, Fair Value Disclosure 0  
Federal Home Loan Bank Borrowings, Fair Value Disclosure 0  
Long-Term Debt, Fair Value 0 0
Other Borrowings, Fair Value Disclosure 0 0
Other liabilities $ 16,328 $ 14,533