Derivative Financial Instruments - Interest Rate Swaps Outstanding (Details) - Interest rate contracts - Designated derivatives $ in Thousands, $ in Millions	Mar. 31, 2025 USD ($)	Mar. 31, 2025 CAD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2024 CAD ($)
Derivative [Line Items]
Interest rate swap assets	$ 7,266		$ 14,141
Interest rate swap liabilities	4,465		3,021
Interest Rate Swap Agreement 1 Maturing July 30 2027
Derivative [Line Items]
Notional	$ 200,000		$ 200,000
Fixed Base Interest Rate Swap	3.05%	3.05%	3.05%	3.05%
Interest rate swap assets	$ 2,624		$ 4,651
Interest rate swap liabilities	0		0
Interest Rate Swap Agreement 2 Maturing July 30 2027
Derivative [Line Items]
Notional	$ 175,000		$ 175,000
Fixed Base Interest Rate Swap	3.47%	3.47%	3.47%	3.47%
Interest rate swap assets	$ 649		$ 2,265
Interest rate swap liabilities	0		0
Interest Rate Swap Agreement 1 Maturing December 31 2027
Derivative [Line Items]
Notional	$ 270,000		$ 270,000
Fixed Base Interest Rate Swap	3.05%	3.05%	3.05%	3.05%
Interest rate swap assets	$ 3,993		$ 7,225
Interest rate swap liabilities	$ 0		$ 0
Interest Rate Swap Agreement 2 Maturing December 31 2027
Derivative [Line Items]
Notional		$ 250		$ 250
Fixed Base Interest Rate Swap	3.59%	3.59%	3.59%	3.59%
Interest rate swap assets	$ 0		$ 0
Interest rate swap liabilities	$ 4,465		$ 3,021