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Goodwill and Intangibles - Summary of Changes in Carrying Amount of Goodwill and Core Deposit Intangible (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Goodwill      
Goodwill beginning balance $ 58,488 $ 58,621 $ 9,353
Goodwill ending balance 58,488 58,488 58,621
CDI      
Core deposit intangibles beginning balance 7,567 9,412 3,409
Core deposit intangibles amortization of intangibles (1,583) (1,845) (763)
Core deposit intangibles ending balance $ 5,984 7,567 9,412
St. Martin Bancshares, Inc.      
Goodwill      
Goodwill acquired during period     49,268
Goodwill acquired during period   (133)  
CDI      
Core deposit intangibles acquired during period   $ 0 $ 6,766