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Securities Available for Sale and Held to Maturity - Contractual Maturities of Available for Sale and Held to Maturity Securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Securities Available for Sale, Amortized Cost [Abstract]    
Due in one year or less $ 34,943  
Due after one year through five years 27,717  
Due after five years through ten years 213,546  
Total amortized cost, before mortgage-backed securities 276,206  
Mortgage-backed securities 1,566,238  
Securities Available for Sale, Amortized Cost 1,842,444 $ 1,719,537
Securities Available for Sale, Estimated Fair Value [Abstract]    
Due in one year or less 35,204  
Due after one year through five years 28,119  
Due after five years through ten years 216,474  
Total fair value, before mortgage-backed securities 279,797  
Mortgage-backed securities 1,597,033  
Total 1,876,830 1,692,534
Securities Held to Maturity, Amortized Cost [Abstract]    
Due in one year or less 0  
Due after one year through five years 30,615  
Due after five years through ten years 0  
Total amortized cost, before mortgage-backed securities 30,615  
Mortgage-backed securities 1,176,839  
Securities Held to Maturity, Amortized Cost 1,207,454 1,335,385
Securities Held to Maturity, Estimated Fair Value [Abstract]    
Due in one year or less 0  
Due after one year through five years 30,800  
Due after five years through ten years 0  
Total fair value, before mortgage-backed securities 30,800  
Mortgage-backed securities 1,149,769  
Total $ 1,180,569 $ 1,259,107