v3.26.1
Fair Value Measurements Details of Book Value and Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]    
AFS, at estimated fair value $ 3,561,050 $ 3,407,859
Debt Securities, Held-to-Maturity, Fair Value 1,393,738 1,267,578
Reported Value Measurement [Member]    
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]    
Cash and due from banks 1,263,067 1,061,609
FRB and FHLB stock 138,587 121,009
Loans held for sale 33,902 16,316
AFS, at estimated fair value 3,561,050 3,407,859
Debt Securities, Held-to-Maturity, Fair Value 1,561,709 1,425,885
Net Loans 25,551,713 23,780,422
Accrued interest receivable 121,220 113,698
Other financial assets 745,340 721,469
Demand and savings deposits 22,668,858 21,739,113
Brokered deposits 975,204 855,042
Time deposits 4,606,280 3,995,252
Accrued interest payable 22,811 17,130
FHLB advances 552,500 250,000
Senior debt and subordinated debt 469,668 367,637
Other borrowings 691,808 679,738
Other financial liabilities 255,705 247,490
Estimate of Fair Value Measurement [Member]    
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]    
Cash and due from banks 1,263,067 1,061,609
FRB and FHLB stock 138,587 121,009
Loans held for sale 33,902 16,316
AFS, at estimated fair value 3,561,050 3,407,859
Debt Securities, Held-to-Maturity, Fair Value 1,393,738 1,267,578
Net Loans 24,179,017 22,590,142
Accrued interest receivable 121,220 113,698
Other financial assets 769,703 741,596
Demand and savings deposits 22,668,858 21,739,113
Brokered deposits 974,546 855,129
Time deposits 4,605,576 3,991,203
Accrued interest payable 22,811 17,130
FHLB advances 552,975 251,991
Senior debt and subordinated debt 440,508 351,870
Other borrowings 658,791 655,154
Other financial liabilities 255,705 247,490
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 1,263,067 1,061,609
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 0 0
Accrued interest receivable 121,220 113,698
Other financial assets 591,819 556,071
Demand and savings deposits 22,668,858 21,739,113
Brokered deposits 78,023 80,215
Time deposits 0 0
Accrued interest payable 22,811 17,130
FHLB advances 552,975 251,991
Senior debt and subordinated debt 0 0
Other borrowings 658,098 654,238
Other financial liabilities 70,390 62,228
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 138,587 121,009
Loans held for sale 33,902 16,316
AFS, at estimated fair value 3,561,050 3,407,859
Debt Securities, Held-to-Maturity, Fair Value 1,393,738 1,267,578
Net Loans 0 0
Accrued interest receivable 0 0
Other financial assets 115,426 132,043
Demand and savings deposits 0 0
Brokered deposits 896,523 774,914
Time deposits 4,605,576 3,991,203
Accrued interest payable 0 0
FHLB advances 0 0
Senior debt and subordinated debt 440,508 351,870
Other borrowings 693 916
Other financial liabilities 171,800 170,290
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 24,179,017 22,590,142
Accrued interest receivable 0 0
Other financial assets 62,458 53,482
Demand and savings deposits 0 0
Brokered deposits 0 0
Time deposits 0 0
Accrued interest payable 0 0
FHLB advances 0 0
Senior debt and subordinated debt 0 0
Other borrowings 0 0
Other financial liabilities $ 13,515 $ 14,972