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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
Sep. 30, 2025
Dec. 31, 2024
Securities Available for Sale, Amortized Cost [Abstract]    
Due in one year or less $ 35,927  
Due after one year through five years 39,643  
Due after five years through ten years 199,943  
Total amortized cost, before mortgage-backed securities 275,513  
Mortgage-backed securities 1,509,430  
Securities Available for Sale, Amortized Cost 1,784,943 $ 1,719,537
Securities Available for Sale, Estimated Fair Value [Abstract]    
Due in one year or less 36,122  
Due after one year through five years 40,166  
Due after five years through ten years 202,516  
Total fair value, before mortgage-backed securities 278,804  
Mortgage-backed securities 1,535,441  
Total 1,814,245 1,692,534
Securities Held to Maturity, Amortized Cost [Abstract]    
Due in one year or less 0  
Due after one year through five years 30,421  
Due after five years through ten years 0  
Total amortized cost, before mortgage-backed securities 30,421  
Mortgage-backed securities 1,238,038  
Securities Held to Maturity, Amortized Cost 1,268,459 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 30,535  
Due after five years through ten years 0  
Total fair value, before mortgage-backed securities 30,535  
Mortgage-backed securities 1,203,201  
Total $ 1,233,736 $ 1,259,107