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Securities - Securities with Unrealized Losses Not Recognized in Income (Detail) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Schedule of Available-for-sale Securities [Line Items]    
12 Months or less, Fair Value $ 109,034 $ 14,130
12 Months or less, Unrealized Loss (455) (34)
More than 12 months, Fair Value 2,633 126
More than 12 months, Unrealized Loss (57) (1)
Total Fair Value 111,667 14,256
Total Unrealized Loss (512) (35)
U.S. Treasury Securities and Obligations of U.S. Government Agencies [Member]    
Schedule of Available-for-sale Securities [Line Items]    
12 Months or less, Fair Value 25,292 6,501
12 Months or less, Unrealized Loss (151) (5)
More than 12 months, Fair Value   126
More than 12 months, Unrealized Loss   (1)
Total Fair Value 25,292 6,627
Total Unrealized Loss (151) (6)
Obligations of States and Political Subdivisions [Member]    
Schedule of Available-for-sale Securities [Line Items]    
12 Months or less, Fair Value 6,428 1,874
12 Months or less, Unrealized Loss (65) (1)
Total Fair Value 6,428 1,874
Total Unrealized Loss (65) (1)
Mortgage-backed Securities in Government Sponsored Entities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
12 Months or less, Fair Value 77,314 5,755
12 Months or less, Unrealized Loss (239) (28)
More than 12 months, Fair Value 2,633  
More than 12 months, Unrealized Loss (57)  
Total Fair Value 79,947 5,755
Total Unrealized Loss $ (296) $ (28)