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Fair Value Measurements - Schedule of Book Value and Estimated Fair Value of Significant Financial Instruments Not Recorded at Fair Value (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Financial Assets:    
Debt securities held-to-maturity $ 2,803,466 $ 825,790
Restricted equity investments 180,711 129,329
Financial Liabilities:    
Time deposits 4,210,664 2,468,850
Securities sold under agreements to repurchase with customers 61,329 54,434
Level 1 Inputs    
Financial Assets:    
Cash and due from banks 274,057 135,130
Debt securities held-to-maturity 0 0
Restricted equity investments 0 0
Loans receivable, net and loans held-for-sale 0 0
Financial Liabilities:    
Deposits other than time deposits 0 0
Time deposits 0 0
FHLB advances and other borrowings 0 0
Securities sold under agreements to repurchase with customers 61,329 54,434
Level 2 Inputs    
Financial Assets:    
Cash and due from banks 0 0
Debt securities held-to-maturity 2,803,465 825,790
Restricted equity investments 0 0
Loans receivable, net and loans held-for-sale 0 0
Financial Liabilities:    
Deposits other than time deposits 13,549,409 8,495,555
Time deposits 4,192,948 2,455,199
FHLB advances and other borrowings 2,225,263 1,662,638
Securities sold under agreements to repurchase with customers 0 0
Level 3 Inputs    
Financial Assets:    
Cash and due from banks 0 0
Debt securities held-to-maturity 0 0
Restricted equity investments 180,711 129,329
Loans receivable, net and loans held-for-sale 15,613,122 10,665,389
Financial Liabilities:    
Deposits other than time deposits 0 0
Time deposits 0 0
FHLB advances and other borrowings 0 0
Securities sold under agreements to repurchase with customers 0 0
Book Value    
Financial Assets:    
Cash and due from banks 274,057 135,130
Debt securities held-to-maturity 2,862,196 881,568
Restricted equity investments 180,711 129,329
Loans receivable, net and loans held-for-sale 16,086,532 10,976,434
Financial Liabilities:    
Deposits other than time deposits 13,549,409 8,495,555
Time deposits 4,210,664 2,468,850
FHLB advances and other borrowings 2,225,589 1,652,412
Securities sold under agreements to repurchase with customers $ 61,329 $ 54,434