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Investment Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Contractual maturities of investments in debt securities available-for-sale, Amortized Cost    
Due in one year or less $ 224,596  
Due after one year through five years 493,746  
Due after five years through ten years 81,820  
Due after ten years 13,262  
Mortgage-backed securities 742,140  
Amortized cost of Investment Securities available-for-sale 1,555,564 $ 1,650,684
Contractual maturities of investments in debt securities available-for-sale, Fair Value    
Due in one year or less 221,779  
Due after one year through five years 488,358  
Due after five years through ten years 82,595  
Due after ten years 13,307  
Mortgage-backed securities 689,078  
Total debt securities available-for-sale 1,495,117 1,536,299
Accrued interest receivable on investment securities available-for-sale 5,330 4,680
U.S. Treasury and Federal agencies securities    
Contractual maturities of investments in debt securities available-for-sale, Amortized Cost    
Amortized cost of Investment Securities available-for-sale 706,387 786,417
Contractual maturities of investments in debt securities available-for-sale, Fair Value    
Total debt securities available-for-sale 699,857 757,749
U.S. States and political subdivisions securities    
Contractual maturities of investments in debt securities available-for-sale, Amortized Cost    
Amortized cost of Investment Securities available-for-sale 106,537 86,305
Contractual maturities of investments in debt securities available-for-sale, Fair Value    
Total debt securities available-for-sale 105,680 82,632
Mortgage-backed securities - Federal agencies    
Contractual maturities of investments in debt securities available-for-sale, Amortized Cost    
Amortized cost of Investment Securities available-for-sale 742,140 777,962
Contractual maturities of investments in debt securities available-for-sale, Fair Value    
Total debt securities available-for-sale 689,078 $ 695,918
Corporate debt securities    
Contractual maturities of investments in debt securities available-for-sale, Amortized Cost    
Amortized cost of Investment Securities available-for-sale 500  
Contractual maturities of investments in debt securities available-for-sale, Fair Value    
Total debt securities available-for-sale $ 502