SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Mortgage Servicing Rights (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Accounting Policies [Abstract]
Mortgage servicing rights	$ 3.3	$ 3.7

Mortgage servicing rights, net fair value disclosure.

No definition available.

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Namespace Prefix:	orrf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant