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Parent Company Only Condensed Financial Information - Schedule of Condensed Statements of Operations (Detail) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Condensed Financial Statements Captions [Line Items]                      
Interest expense                 $ (10,138,000) $ (12,954,000) $ (7,570,000)
Income tax expense                 (4,940,000) (5,683,000) (2,640,000)
Net income $ 10,173,000 $ 7,682,000 $ 6,504,000 $ 7,833,000 $ 7,841,000 $ 7,708,000 $ 8,660,000 $ 9,669,000 32,192,000 33,878,000 14,139,000
Comprehensive income                 39,937,000 42,204,000 14,089,000
CBI[Member]                      
Condensed Financial Statements Captions [Line Items]                      
Dividends from bank subsidiaries                 15,300,000 13,300,000 10,000,000
Dividends from non-bank subsidiaries                 440,000    
Interest expense                 (945,000) (1,423,000) (1,320,000)
Pension expense                 (25,000) 176,000 199,000
Acquisition expense                     (10,738,000)
Other expense, net                 (1,241,000) (1,107,000) (1,740,000)
Income (loss) before equity in undistributed net earnings of subsidiaries                 13,529,000 10,946,000 (3,599,000)
Income tax expense                 475,000 494,000 1,751,000
Equity in undistributed net earnings of subsidiaries                 18,188,000 22,438,000 15,987,000
Net income                 32,192,000 33,878,000 14,139,000
Comprehensive income                 $ 39,937,000 $ 42,204,000 $ 14,089,000