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Stock-Based Compensation Plans (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended		3 Months Ended		9 Months Ended		42 Months Ended	48 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Jun. 30, 2018	Jun. 30, 2018
Stock based compensation expense			$ 374	$ 204	$ 1,201	$ 860
Stock based compensation, income tax benefit					281	318
Proceeds from stock options exercised			0	0	324	287
Employees [Member]
Stock based compensation expense			301	138	629	324	$ 3,900
Stock-based compensation expense expected to be recorded			305		305
Vesting period							3 years
Grants in period (options)							135,189
Non-employee directors [Member]
Stock based compensation expense	$ 352	$ 320
Stock-based compensation expense expected to be recorded	352						$ 352	$ 352
Equity grants value	$ 32
Grants in period (options)	8,393	11,190
Exercise price	$ 41.93	$ 28.59					$ 41.93	$ 41.93
Director [Member]
Grants in period (options)	763	1,119
Employee grants [Member]
Stock based compensation expense					849
Restricted Stock [Member] | Senior Executives [Member]
Stock based compensation expense			73	$ 66	220	$ 216
Stock-based compensation expense expected to be recorded			73		$ 73
Vesting period					3 years
Total compensation expense associated with senior executives grants			$ 1,400		$ 1,400
Grants in period (options)								54,529
Percent of bonus earned under the incentive plan in cash					50.00%
Percent of bonus earned under the incentive plan in shares of restricted stock					50.00%
First Bancorp 2014 Equity Plan [Member]
Shares remaining available for grant			745,104		745,104
First Bancorp Plans [Member]
Stock options outstanding			9,000		9,000
Exercise price			$ 14.35		$ 14.35

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Net value of non-option equity instruments granted to participants.

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