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Securities Held to Maturity - Stratification by Contractual Maturity of Securities (Detail) - Debt Securities [Member] - USD ($)
$ in Thousands
Sep. 30, 2019
Jun. 30, 2019
Schedule Of Held To Maturity Securities [Line Items]    
Due in one year or less, Fair Value $ 6,159  
Due after one year through five years, Fair Value 20,203  
Due after five years through ten years, Fair Value 12,321  
Held-to-maturity Securities, Fair Value Total 38,683 $ 169,857
Due in one year or less, Amortized Cost 6,155  
Due after one year through five years, Amortized Cost 19,931  
Due after five years through ten years, Amortized Cost 11,802  
Amortized Cost $ 37,888 $ 167,172