Mergers and Acquisitions - Pro Forma Combined Condensed Consolidated Financial Information (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Brand Mortgage Group, LLC
Business Acquisition [Line Items]
Interest income		$ 357
Interest expense		279
Net interest income		78
Noninterest income		4,043
Noninterest expense		4,398
Net loss before taxes		(277)
Metropolitan Bancgroup, Inc.
Business Acquisition [Line Items]
Net interest income	$ 443,657	455,513
Noninterest income	153,254	153,850
Noninterest expense	374,174	452,699
Net loss before taxes	$ 167,596	$ 115,646
Earnings per share - pro forma:
Basic (usd per share)	$ 2.89	$ 1.97
Diluted (usd per share)	$ 2.88	$ 1.97