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Loans - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Loans held for sale $ 387,514,000 $ 249,846,000
Acquired impaired loans from merger $ 13,713,548,000 $ 13,429,532,000
Percentage of acquired impaired loans from merger on total gross loans 1.00% 1.12%
Recorded investment in acquired impaired loans $ 124,779,000 $ 195,706,000
Unamortized deferred loan fees 71,542,000 93,372,000
Loans-in-process 49,456,000 53,997,000
Overdrafts from deposit accounts 22,219,000 13,833,000
Directors and Officers [Member]    
Related party loans 38,558,000 93,282,000
Additional amount of loan 9,358,000  
Repayment of Loan 64,082,000  
Loans Acquired with Deteriorated Credit Quality [Member]    
Acquired impaired loans from merger $ 96,004,000 $ 149,737,000