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Fair Value of Financial Instruments - Carrying Value and Estimated Fair Values of Financial Instruments Not Measured at Fair Value (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Securities held to maturity $ 10,018 $ 10,456
Carrying Value | Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 626,909 470,249
Carrying Value | Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Non-marketable equity securities held in other financial institutions 31,041 71,643
Accrued interest and loan fees receivable 36,944 38,901
Deposits 8,331,830 8,223,120
FHLB advances, repurchase agreements and other borrowings 12,790 12,460
Subordinated indebtedness 89,715 159,943
Accrued interest payable 4,680 8,033
Carrying Value | Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Securities held to maturity 10,559 11,095
LHFI, net 7,440,840 7,482,653
Estimated Fair Value | Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 626,909 470,249
Estimated Fair Value | Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Non-marketable equity securities held in other financial institutions 31,041 71,643
Accrued interest and loan fees receivable 36,944 38,901
Deposits 8,327,798 8,217,564
FHLB advances, repurchase agreements and other borrowings 12,715 12,203
Subordinated indebtedness 89,714 159,928
Accrued interest payable 4,680 8,033
Estimated Fair Value | Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Securities held to maturity 10,018 10,456
LHFI, net $ 7,294,810 $ 7,209,866