Leases - Narrative (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2024 lease	Jun. 30, 2024 property	Jun. 30, 2024 USD ($)	Jun. 30, 2024	Dec. 31, 2023 USD ($) property	Aug. 31, 2023 property
Operating Leased Assets [Line Items]
Number of postal properties subject to direct financing leases (in properties)					2	2			2
Number of operating leases (in properties) | property						75
Number of leases acquired with purchase price greater than value of underlying asset (in properties) | property						71
Aggregate carrying value							$ 52,800
Aggregate purchase price							68,200
Number of operating leases not acquired (in properties) | property						4
Purchase price for postal properties							3,300
ROU asset – operating leases							895		$ 967
Lease liability – operating leases							$ 923
Weighted average remaining lease term	23 years 9 months 18 days		23 years 9 months 18 days
Operating lease expense	$ 70	$ 60	$ 100	$ 100
Number Of Properties Terminated | property										1
Minimum
Operating Leased Assets [Line Items]
Remaining lease term	1 year 1 month 6 days		1 year 1 month 6 days
Weighted average discount rate								4.25%
Maximum
Operating Leased Assets [Line Items]
Remaining lease term	58 years 6 months		58 years 6 months
Weighted average discount rate								7.35%