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Fair Value Measurements Details of Book Value and Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]    
AFS, at estimated fair value $ 3,410,899 $ 2,398,352
Estimated Fair Value 1,183,449  
Carrying Amount    
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]    
Cash and cash equivalents 1,063,871 549,710
FRB and FHLB stock 139,574 124,405
Loans held for sale 25,618 15,158
AFS, at estimated fair value 1,395,569 1,267,922
Estimated Fair Value 3,410,899 2,398,352
Loans, net 23,665,763 21,057,690
Accrued interest receivable 117,029 107,972
Other assets 736,502 661,067
Demand and savings deposits 21,135,478 17,653,690
Brokered deposits 843,857 1,144,692
Time deposits 4,150,098 2,739,241
Accrued interest payable 31,620 35,083
Federal Funds Purchased, Fair Value Disclosure   240,000
Federal Home Loan Bank Borrowings, Fair Value Disclosure 850,000 1,100,000
Long-Term Debt, Fair Value 367,316 535,384
Other Borrowings, Fair Value Disclosure 564,732 612,142
Other liabilities 467,011 429,046
Estimate of Fair Value Measurement    
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]    
Cash and cash equivalents 1,063,871 549,710
FRB and FHLB stock 139,574 124,405
Loans held for sale 25,618 15,158
AFS, at estimated fair value 1,183,449 1,072,207
Estimated Fair Value 3,410,899 2,398,352
Loans, net 22,555,687 19,930,560
Accrued interest receivable 117,029 107,972
Other assets 762,903 661,067
Demand and savings deposits 21,135,478 17,653,690
Brokered deposits 843,703 1,145,379
Time deposits 4,154,726 2,714,709
Accrued interest payable 31,620 35,083
Federal Funds Purchased, Fair Value Disclosure   240,000
Federal Home Loan Bank Borrowings, Fair Value Disclosure 851,470 1,094,013
Long-Term Debt, Fair Value 253,818 463,270
Other Borrowings, Fair Value Disclosure 545,809 612,106
Other liabilities 467,011 429,046
Level 1 | Estimate of Fair Value Measurement    
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]    
Cash and cash equivalents 1,063,871 549,710
FRB and FHLB stock 0 0
Loans held for sale 0 0
AFS, at estimated fair value 0 0
Estimated Fair Value 0 42,161
Loans, net 0 0
Accrued interest receivable 117,029 107,972
Other assets 543,251 452,935
Demand and savings deposits 21,135,478 17,653,690
Brokered deposits 145,056 145,987
Time deposits 0 0
Accrued interest payable 31,620 35,083
Federal Funds Purchased, Fair Value Disclosure   240,000
Federal Home Loan Bank Borrowings, Fair Value Disclosure 851,470 1,094,013
Long-Term Debt, Fair Value 0 0
Other Borrowings, Fair Value Disclosure 544,908 611,269
Other liabilities 200,029 165,635
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 139,574 124,405
Loans held for sale 25,618 15,158
AFS, at estimated fair value 1,183,449 1,072,207
Estimated Fair Value 3,410,899 2,356,191
Loans, net 0 0
Accrued interest receivable 0 0
Other assets 159,939 157,540
Demand and savings deposits 0 0
Brokered deposits 698,647 999,392
Time deposits 4,154,726 2,714,709
Accrued interest payable 0 0
Federal Funds Purchased, Fair Value Disclosure   0
Federal Home Loan Bank Borrowings, Fair Value Disclosure 0 0
Long-Term Debt, Fair Value 253,818 463,270
Other Borrowings, Fair Value Disclosure 901 837
Other liabilities 252,821 246,157
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 22,555,687 19,930,560
Accrued interest receivable 0 0
Other assets 59,713 50,592
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 0
Long-Term Debt, Fair Value 0 0
Other Borrowings, Fair Value Disclosure 0 0
Other liabilities $ 14,161 $ 17,254