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Acquisition - Schedule of Preliminary Estimated Fair Value Amounts Assigned to Major Asset and Liability Categories at Acquisition Date (Detail) - TB&T Bancshares, Inc. and The Bank & Trust of Bryan College Station, Texas [Member] - USD ($)
$ in Thousands
Sep. 30, 2021
Jan. 02, 2020
Business Acquisition [Line Items]    
Cash and cash equivalents $ 61,028  
Securities available-for-sale 93,967  
Loans 447,702 $ 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