Business Combinations - Schedule of Identifiable Assets Acquired and Liability Assumed (Details) - USD ($) $ in Thousands	Feb. 01, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Goodwill recorded for Community Financial		$ 350,298	$ 349,398	$ 236,347
Community Financial Holding Co. Inc.
Business Acquisition [Line Items]
Purchase price	$ 2,320
Cash and due from banks	1,085
Overnight investments	35,129
Investment securities	30,146
Loans	133,989
Premises and equipment	7,624
Other real estate owned	9,813
Income earned not collected	558
Intangible assets	536
Other assets	2,520
Total assets acquired	221,400
Deposits	209,340
Borrowings	9,925
Other liabilities	501
Total liabilities assumed	219,766
Fair value of net assets acquired	1,634
Goodwill recorded for Community Financial	$ 686