Income Taxes - Narrative (Details) - USD ($)			1 Months Ended	12 Months Ended
	Dec. 22, 2017	Dec. 15, 2017	Jun. 30, 2010	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Contingency [Line Items]
Increase in deferred tax assets related to purchase accounting adjustments				$ 611,000
Income tax expense (benefit)	$ 15,200,000			(2,500,000)
Reclassification of tax effects from AOCI					$ 0
Reserves for uncertain tax positions				0
Operating loss carryforwards				46,300,000
Unrecognized tax benefits, increase resulting from acquisition			$ 2,500,000
Retained Earnings
Income Tax Contingency [Line Items]
Reclassification of tax effects from AOCI				782,000	$ 782,000
Royal Bancshares of Pennsylvania, Inc.
Income Tax Contingency [Line Items]
Increase in deferred tax assets related to purchase accounting adjustments		$ 33,100,000		1,100,000
Operating loss carryforwards, additional utilization, acquired from business combination		5,000,000
Deferred Tax Assets for State Net Operating Losses
Income Tax Contingency [Line Items]
Deferred tax assets, valuation allowance				705,000
Unrealized Capital Losses For Partnership Investments
Income Tax Contingency [Line Items]
Deferred tax assets, valuation allowance				616,000
Internal Revenue Service (IRS)
Income Tax Contingency [Line Items]
Operating loss carryforwards, annual limitation				$ 2,700,000
Alternative minimum tax credit carry forward		1,100,000
Internal Revenue Service (IRS) | Royal Bancshares of Pennsylvania, Inc.
Income Tax Contingency [Line Items]
Alternative minimum tax credit carry forward		$ 532,000