Acquisition - Schedule of Preliminary Estimated Fair Value Amounts Assigned to Major Asset and Liability Categories at Acquisition Date (Detail) $ in Thousands	Jun. 30, 2020 USD ($)
Business Acquisition [Line Items]
Cash and cash equivalents	$ 61,028
Securities available-for-sale	93,967
Loans	447,702
Identifiable intangible assets	4,798
Other assets	25,377
Total identifiable assets acquired	632,872
Deposits	549,125
Other liabilities	5,397
Total liabilities assumed	554,522
Fair value of net identifiable assets acquired	78,350
Goodwill resulting from acquisition	$ 141,923