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Borrowings and Borrowings Availability (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Short-term borrowings	$ 198,000,000.0	$ 253,000,000.0
Borrowings	$ 303,430,000	$ 409,550,000
Trust Preferred Securities due January 2034
Debt Instrument [Line Items]
Basis spread on variable rate	2.70%	2.70%
Borrowings	$ 20,620,000	$ 20,620,000
First Bancorp Capital Trust II
Debt Instrument [Line Items]
Borrowings	10,300,000
First Bancorp Capital Trust III
Debt Instrument [Line Items]
Borrowings	$ 10,300,000
Trust Preferred Securities due June 2036
Debt Instrument [Line Items]
Basis spread on variable rate	1.39%	1.39%
Borrowings	$ 25,774,000	$ 25,774,000
Trust Preferred Securities due January 2035
Debt Instrument [Line Items]
Basis spread on variable rate	2.00%	2.00%
Borrowings	$ 10,310,000	$ 10,310,000
FHLB Line of Credit
Debt Instrument [Line Items]
Line of credit, borrowing capacity	1,050,000,000.00
Line of credit, outstanding	247,000,000	353,000,000
Line of credit, amount reduced	190,000,000	190,000,000
Unused portion	610,000,000	502,000,000
FRB Line of Credit
Debt Instrument [Line Items]
Line of credit, borrowing capacity	129,000,000
Line of credit, outstanding	0	0
Federal Funds Line of Credit
Debt Instrument [Line Items]
Line of credit, borrowing capacity	35,000,000
Line of credit, outstanding	$ 0	$ 0

X

- Definition

Amount reduced due to the Company''s pledging letters of credit for public deposits.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

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- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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