Income Taxes - Textual (Details) $ in Millions	6 Months Ended
	Jun. 30, 2019 USD ($)
U.S. federal | Earliest Tax Year
Operating Loss Carryforwards [Line Items]
Open tax year	2015
State | Earliest Tax Year
Operating Loss Carryforwards [Line Items]
Open tax year	2015
Metropolitan
Operating Loss Carryforwards [Line Items]
Net operating losses	$ 91.3
Reliance Bancshares, Inc.
Operating Loss Carryforwards [Line Items]
Net operating losses	$ 58.5