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Stock-Based Compensation (Narrative) (Details)	3 Months Ended				6 Months Ended
	Mar. 31, 2025 USD ($)	Jun. 30, 2024 USD ($) shares	Mar. 31, 2024 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($) director shares	Jun. 30, 2023 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense		$ 900,000		$ 1,100,000	$ 1,600,000	$ 2,200,000
Stock-based compensation tax benefit		218,000		$ 261,000	$ 371,000	$ 520,000
Non-Employee Director Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of directors | director					12
Director equity grants granted, value			$ 37,500
Non-Employee Director Awards | Forecast
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Director equity grants granted, value	$ 37,500
Long-Term Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense		3,900,000			$ 3,900,000
Unrecognized compensation expense, period for recognition					1 year 6 months
Long-Term Restricted Stock Awards | Next Twelve Months
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense		2,600,000			$ 2,600,000
Long-Term Restricted Stock Awards | Remaining Quarters of 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense		$ 1,700,000			$ 1,700,000
First Bancorp 2014 Equity Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares remaining available for grant | shares		1,976,567			1,976,567

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