SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, Business and Organization (Details)	12 Months Ended
Dec. 31, 2023 Branch Center
Business and Organization [Abstract]
Number of full service banking offices \| Branch	39
Number of mortgage centers \| Center	4

The number of mortgage centers acquired in business combination.

No definition available.

Name:	czfs_NumberOfMortgageCentersAcquired
Namespace Prefix:	czfs_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration