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Securities - Stratification by Contractual Maturity of Securities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2022
Jun. 30, 2022
Amortized Cost    
Amortized Cost $ 1,437,195 $ 1,462,124
Fair Value    
Fair Value 1,286,354 1,344,093
Amortized Cost    
Amortized Cost 153,786 118,291
Fair Value    
Fair Value 138,393 108,118
Debt securities:    
Amortized Cost    
Due in one year or less 0  
Due after one year through five years 11,865  
Due after five years through ten years 342,467  
Due after ten years 359,973  
Amortized Cost 714,305 673,555
Fair Value    
Due in one year or less 0  
Due after one year through five years 11,783  
Due after five years through ten years 326,847  
Due after ten years 349,007  
Fair Value 687,637 656,202
Amortized Cost    
Due in one year or less 4,160  
Due after one year through five years 12,946  
Due after five years through ten years 1,700  
Due after ten years 0  
Amortized Cost 18,806 21,159
Fair Value    
Due in one year or less 4,143  
Due after one year through five years 12,713  
Due after five years through ten years 1,665  
Due after ten years 0  
Fair Value $ 18,521 $ 21,125