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Fair Value Measurements - Schedule of Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
ASSETS:    
Cash and cash equivalents $ 555,560 $ 127,848
Investment securities available-for-sale (at fair value) 612,719 527,547
Investment securities held-to-maturity, fair value 630,802 451,386
Held-to-maturity securities 689,486 533,108
Equity securities with readily determinable fair values 4,113  
Loans receivable 7,341,221 7,656,688
Loans held for sale 22,252 24,495
LIABILITIES    
Time deposits 1,160,123 1,020,036
Securities sold under agreements to repurchase 21,303 18,895
Long-term debt 54,743 54,511
Federal Home Loan Bank advances   50,000
Carrying amount | Level 1    
ASSETS:    
Cash and cash equivalents 555,560 127,848
Equity securities with readily determinable fair values 4,113  
Carrying amount | Level 2    
ASSETS:    
FHLB and FRB stock 24,635 27,984
Loans held for sale 22,252 24,495
Accrued interest receivable 49,171 43,469
LIABILITIES    
Deposit transaction accounts 7,311,557 7,217,857
Time deposits 1,160,123 1,020,036
Securities sold under agreements to repurchase 21,303 18,895
Long-term debt 55,000 55,000
Federal Home Loan Bank advances   50,000
Accrued interest payable 18,629 15,146
Carrying amount | Level 3    
ASSETS:    
Loans receivable 7,429,501 7,751,143
Estimated fair value | Level 1    
ASSETS:    
Cash and cash equivalents 555,560 127,848
Equity securities with readily determinable fair values 4,113  
Estimated fair value | Level 2    
ASSETS:    
FHLB and FRB stock 24,635 27,984
Loans held for sale 22,252 24,495
Accrued interest receivable 49,171 43,469
LIABILITIES    
Deposit transaction accounts 7,311,557 7,217,857
Time deposits 1,162,530 1,021,763
Securities sold under agreements to repurchase 21,303 18,895
Long-term debt 52,796 49,168
Federal Home Loan Bank advances   50,000
Accrued interest payable 18,629 15,146
Estimated fair value | Level 3    
ASSETS:    
Loans receivable 7,291,655 7,535,875
U.S. Treasury securities    
ASSETS:    
Investment securities available-for-sale (at fair value) 73,962 24,874
Investment securities held-to-maturity, fair value 24,720 49,159
Held-to-maturity securities 24,840 49,639
U.S. Treasury securities | Carrying amount | Level 1    
ASSETS:    
Investment securities available-for-sale (at fair value) 73,962 24,874
Investment securities held-to-maturity, fair value 24,840 49,639
U.S. Treasury securities | Estimated fair value | Level 1    
ASSETS:    
Investment securities available-for-sale (at fair value) 73,962 24,874
Investment securities held-to-maturity, fair value 24,720 49,159
Residential mortgage pass-through securities issued or guaranteed by U.S. government agencies or sponsored enterprises    
ASSETS:    
Investment securities available-for-sale (at fair value) 208,517 135,045
Investment securities held-to-maturity, fair value 219,703 234,286
Held-to-maturity securities 244,916 271,105
Residential mortgage pass-through securities issued or guaranteed by U.S. government agencies or sponsored enterprises | Carrying amount | Level 2    
ASSETS:    
Investment securities available-for-sale (at fair value) 208,517 135,045
Held-to-maturity securities 244,916 271,105
Residential mortgage pass-through securities issued or guaranteed by U.S. government agencies or sponsored enterprises | Estimated fair value | Level 2    
ASSETS:    
Investment securities available-for-sale (at fair value) 208,517 135,045
Held-to-maturity securities 219,703 234,286
Other residential MBS issued or guaranteed by U.S. government agencies or sponsored enterprises    
ASSETS:    
Investment securities available-for-sale (at fair value) 327,527 364,938
Investment securities held-to-maturity, fair value 386,379 167,941
Held-to-maturity securities 419,730 212,364
Other residential MBS issued or guaranteed by U.S. government agencies or sponsored enterprises | Carrying amount | Level 2    
ASSETS:    
Investment securities available-for-sale (at fair value) 327,527 364,938
Held-to-maturity securities 419,730 212,364
Other residential MBS issued or guaranteed by U.S. government agencies or sponsored enterprises | Estimated fair value | Level 2    
ASSETS:    
Investment securities available-for-sale (at fair value) 327,527 364,938
Held-to-maturity securities 386,379 167,941
Corporate debt    
ASSETS:    
Investment securities available-for-sale (at fair value) 1,990 1,962
Corporate debt | Carrying amount | Level 2    
ASSETS:    
Investment securities available-for-sale (at fair value) 1,990 1,962
Corporate debt | Estimated fair value | Level 2    
ASSETS:    
Investment securities available-for-sale (at fair value) 1,990 1,962
Other securities    
ASSETS:    
Investment securities available-for-sale (at fair value) 723 728
Other securities | Carrying amount | Level 3    
ASSETS:    
Investment securities available-for-sale (at fair value) 723 728
Other securities | Estimated fair value | Level 3    
ASSETS:    
Investment securities available-for-sale (at fair value) 723 728
Interest rate swap | Carrying amount | Level 2    
ASSETS:    
Derivative asset $ 28,536 $ 39,637
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Other Assets Other Assets
LIABILITIES    
Derivative liability $ 11,322 $ 9,076
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Other Liabilities. Other Liabilities.
Interest rate swap | Estimated fair value | Level 2    
ASSETS:    
Derivative asset $ 28,536 $ 39,637
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Other Assets Other Assets
LIABILITIES    
Derivative liability $ 11,322 $ 9,076
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Other Liabilities. Other Liabilities.
Mortgage banking derivatives | Carrying amount | Level 3    
ASSETS:    
Derivative asset $ 412 $ 386
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Other Assets Other Assets
LIABILITIES    
Derivative liability $ 14 $ 10
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Other Liabilities. Other Liabilities.
Mortgage banking derivatives | Estimated fair value | Level 3    
ASSETS:    
Derivative asset $ 412 $ 386
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Other Assets Other Assets
LIABILITIES    
Derivative liability $ 14 $ 10
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Other Liabilities. Other Liabilities.