Goodwill and Intangible Assets - Deposits Purchased Premium and Discount, Amortization and Accretion (Details) - Deposits Purchased Premium (Discount) Net - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Remaining accretion
2022	$ 4
2023	2
Net deposit discount	$ 6	$ 9	$ 23

Amount of accretion of net deposits purchase discount expected to be recognized during the next fiscal year following the latest fiscal year.

No definition available.

Name:	ptrs_DepositDiscountAccretionNextTwelveMonths
Namespace Prefix:	ptrs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant