Goodwill and Other Intangible Assets - Summary of Goodwill and Other Intangible Assets (Parenthetical) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Core Deposit
Goodwill And Other Intangible Assets [Line Items]
Accumulated amortization of intangible assets	$ 65,793	$ 60,836
Customer Lists
Goodwill And Other Intangible Assets [Line Items]
Accumulated amortization of intangible assets	22,488	21,908
Noncompete Agreements
Goodwill And Other Intangible Assets [Line Items]
Accumulated amortization of intangible assets	172	137
Trademarks
Goodwill And Other Intangible Assets [Line Items]
Accumulated amortization of intangible assets	$ 95	$ 75