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Stock-Based Compensation (Narrative) (Details) $ / shares in Units, $ in Thousands			9 Months Ended	12 Months Ended
	Jun. 01, 2019 USD ($) $ / shares shares	Jun. 01, 2018 USD ($) $ / shares shares	Sep. 30, 2019 USD ($) director	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2016 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense				$ 2,270	$ 1,569	$ 1,095
Income tax benefits related to stock-based compensation expense				$ 522	$ 367	$ 405
Stock options outstanding (in shares) | shares				0	9,000	38,689	59,948
Proceeds from stock options exercised				$ 129	$ 324	$ 287
Non-Employee Director Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 320	$ 352
Director equity grants granted, value			$ 32
Number of directors | director			10
Granted during the period (in shares) | shares	9,030	8,393
Granted during the period, per director (in shares) | shares	903	763
Granted during the period (in dollars per share) | $ / shares	$ 35.41	$ 41.93
Long-Term Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted during the period (in shares) | shares				82,826	66,060	48,322
Granted during the period (in dollars per share) | $ / shares				$ 36.36	$ 40.04	$ 31.05
Unrecognized compensation expense				$ 3,100
Unrecognized compensation expense, period for recognition				2 years
Long-Term Restricted Stock | Next Twelve Months
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense				$ 1,740
First Bancorp 2014 Equity Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares remaining available for grant (in shares) | shares				632,726
First Bancorp Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options outstanding (in shares) | shares				0

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