Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Line Items]
Federal statutory tax rate	21.00%	21.00%	35.00%
Provisional amount related to re-measurement of deferred tax			$ 12,800,000
Change in Provisional amount related to re-measurement of deferred tax		$ 100,000
Valuation allowance of deferred tax assets	$ 0
Qualifying and non-qualifying tax bad debt reserves	45,900,000	45,900,000
Provision for income taxes	0
Related amount of unrecognized deferred tax liability	10,800,000	10,800,000
Federal and state income taxes applicable to securities transactions	1,000,000.0	(200,000)	200,000
Unrecognized tax benefits and interest	434,000	$ 465,000	$ 467,000	$ 436,000
Unrecognized tax benefits that would affect the effective tax rate	500,000
YCB and OLBK [Member]
Income Tax Disclosure [Line Items]
Federal deferred tax assets net operating loss carryforwards	$ 32,000,000.0
YCB and OLBK [Member] | Indiana [Member]
Income Tax Disclosure [Line Items]
Net operating loss carryforwards expiration date	2035
State and local deferred tax assets net operating loss carryforwards	$ 3,900,000
YCB and OLBK [Member] | Maryland [Member]
Income Tax Disclosure [Line Items]
Net operating loss carryforwards expiration date	2035
State and local deferred tax assets net operating loss carryforwards	$ 18,000,000.0
Earliest Tax Year [Member]
Income Tax Disclosure [Line Items]
Earliest year for tax examination	2016
Earliest Tax Year [Member] | YCB and OLBK [Member]
Income Tax Disclosure [Line Items]
Net operating loss carryforwards expiration date	2030
Latest Tax Year [Member] | YCB and OLBK [Member]
Income Tax Disclosure [Line Items]
Net operating loss carryforwards expiration date	2036