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Investment Securities - Summary of Investments Classified by Contractual Maturity Date (Detail) $ in Thousands	Mar. 31, 2020 USD ($)
Schedule Of Investments [Abstract]
Securities Available for Sale, Amortized Cost, Due after one year through five years	$ 2,000
Securities Available for Sale, Amortized Cost, Due after five years through ten years	19,682
Securities Available for Sale, Amortized Cost, Due after ten years	77,327
Securities Available for Sale, Amortized Cost, Total	99,009
Securities Available for Sale, Fair Value, Due after one year through five years	1,969
Securities Available for Sale, Fair Value, Due after five years through ten years	17,648
Securities Available for Sale, Fair Value, Due after ten years	79,315
Securities Available for Sale, Fair Value, Total	98,932
Securities Held to Maturity, Amortized Cost, Due in one year or less	451
Securities Held to Maturity, Amortized Cost, Due after one year through five years	1,627
Securities Held to Maturity, Amortized Cost, Due after five years through ten years	3,763
Securities Held to Maturity, Amortized Cost, Due after ten years	5,378
Securities Held to Maturity, Amortized Cost, Total	11,219
Securities Held to Maturity, Fair Value, Due in one year or less	453
Securities Held to Maturity, Fair Value, Due after one year through five years	1,677
Securities Held to Maturity, Fair Value, Due after five years through ten years	4,026
Securities Held to Maturity, Fair Value, Due after ten years	5,559
Securities Held to Maturity, Fair Value, Total	$ 11,715

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