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Fair Value Measurements Details of Book Value and Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]    
AFS, at estimated fair value $ 2,398,352 $ 2,646,767
Estimated Fair Value 1,072,207  
Carrying Amount    
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]    
Cash and cash equivalents 549,710 681,921
FRB and FHLB stock 124,405 130,186
Loans held for sale 15,158 7,264
AFS, at estimated fair value 1,267,922 1,321,256
Estimated Fair Value 2,398,352 2,646,767
Loans, net 21,057,690 20,010,181
Accrued interest receivable 107,972 91,579
Other assets 661,067 642,049
Demand and savings deposits 17,653,690 18,851,912
Brokered deposits 1,144,692 208,416
Time deposits 2,739,241 1,589,210
Accrued interest payable 35,083 10,185
Federal Funds Purchased, Fair Value Disclosure 240,000 191,000
Federal Home Loan Bank Borrowings, Fair Value Disclosure 1,100,000 1,250,000
Long-Term Debt, Fair Value 535,384 539,634
Other Borrowings, Fair Value Disclosure 612,142 890,573
Other liabilities 429,046 467,705
Estimate of Fair Value Measurement    
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]    
Cash and cash equivalents 549,710 681,921
FRB and FHLB stock 124,405 130,186
Loans held for sale 15,158 7,264
AFS, at estimated fair value 1,072,207 1,125,049
Estimated Fair Value 2,398,352 2,646,767
Loans, net 19,930,560 18,862,701
Accrued interest receivable 107,972 91,579
Other assets 661,067 642,049
Demand and savings deposits 17,653,690 18,851,912
Brokered deposits 1,145,379 213,501
Time deposits 2,714,709 1,574,747
Accrued interest payable 35,083 10,185
Federal Funds Purchased, Fair Value Disclosure 240,000 190,998
Federal Home Loan Bank Borrowings, Fair Value Disclosure 1,094,013 1,249,629
Long-Term Debt, Fair Value 463,270 456,867
Other Borrowings, Fair Value Disclosure 612,106 890,573
Other liabilities 429,046 467,705
Level 1 | Estimate of Fair Value Measurement    
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]    
Cash and cash equivalents 549,710 681,921
FRB and FHLB stock 0 0
Loans held for sale 0 0
AFS, at estimated fair value 0 0
Estimated Fair Value 42,161 218,485
Loans, net 0 0
Accrued interest receivable 107,972 91,579
Other assets 452,935 419,419
Demand and savings deposits 17,653,690 18,851,912
Brokered deposits 145,987 188,416
Time deposits 0 0
Accrued interest payable 35,083 10,185
Federal Funds Purchased, Fair Value Disclosure 240,000 190,998
Federal Home Loan Bank Borrowings, Fair Value Disclosure 1,094,013 1,249,629
Long-Term Debt, Fair Value 0 0
Other Borrowings, Fair Value Disclosure 611,269 889,393
Other liabilities 165,635 154,912
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 124,405 130,186
Loans held for sale 15,158 7,264
AFS, at estimated fair value 1,072,207 1,125,049
Estimated Fair Value 2,356,191 2,428,282
Loans, net 0 0
Accrued interest receivable 0 0
Other assets 157,540 166,796
Demand and savings deposits 0 0
Brokered deposits 999,392 25,085
Time deposits 2,714,709 1,574,747
Accrued interest payable 0 0
Federal Funds Purchased, Fair Value Disclosure 0 0
Federal Home Loan Bank Borrowings, Fair Value Disclosure 0 0
Long-Term Debt, Fair Value 463,270 456,867
Other Borrowings, Fair Value Disclosure 837 1,180
Other liabilities 246,157 296,465
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 0
Loans, net 19,930,560 18,862,701
Accrued interest receivable 0 0
Other assets 50,592 55,834
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 0
Federal Home Loan Bank Borrowings, Fair Value Disclosure 0 0
Long-Term Debt, Fair Value 0 0
Other Borrowings, Fair Value Disclosure 0 0
Other liabilities $ 17,254 $ 16,328