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Condensed Parent Company Only Financial Statements - Condensed Statements of Operations (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Operating income                      
Interest income $ 25,444 $ 25,474 $ 25,921 $ 25,369 $ 25,903 $ 26,109 $ 25,575 $ 24,725 $ 102,208 $ 102,312 $ 74,398
Operating expenses                      
Income before income tax expense 8,292 8,159 8,135 9,206 8,705 10,369 9,778 9,433 33,792 38,285 29,317
Income tax benefit 1,686 1,303 1,555 1,316 616 2,107 2,002 1,970 5,860 6,695 12,493
Net Income $ 6,606 $ 6,856 $ 6,580 $ 7,890 $ 8,089 $ 8,262 $ 7,776 $ 7,463 27,932 31,590 16,824
Parent Company                      
Operating income                      
Interest income                 0 0 0
Dividend from subsidiary                 21,000 0 0
Total operating income                 21,000 0 0
Operating expenses                      
Other expenses                 192 219 217
Total operating expenses                 192 219 217
Income before income tax expense                 20,808 (219) (217)
Income tax benefit                 (40) (44) (87)
Income (loss) before equity in undistributed earnings of subsidiary                 20,848 (175) (130)
Undistributed earnings of subsidiary                 7,084 31,765 16,954
Net Income                 $ 27,932 $ 31,590 $ 16,824