Loans and Asset Quality Information (Schedule of Analysis of Payment Status of Loans) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Analysis of the payment status of loans
30-59 Days Past Due	$ 24,849	$ 26,338
60-89 Days Past Due	6,433	6,819
Nonaccrual loans	60,574	79,155
Current	2,303,372	2,349,954
Total loans	2,268,580	2,252,885
Total Covered Loans - Carrying Value	127,594	210,309
Loans	2,396,174fbp_Loans	2,463,194fbp_Loans
Commercial Unsecured [Member]
Analysis of the payment status of loans
Nonaccrual loans	188	260
Commercial Secured [Member]
Analysis of the payment status of loans
Nonaccrual loans	2,927	2,776
Secured by Inventory and Accounts Receivable [Member]
Analysis of the payment status of loans
Nonaccrual loans	557	1,327
Real Estate construction, land development and other land loans [Member]
Analysis of the payment status of loans
Nonaccrual loans	9,031	21,557
Real estate residential, farmland and mutli-family [Member]
Analysis of the payment status of loans
Nonaccrual loans	32,244	30,158
Real estate home equity lines of credit [Member]
Analysis of the payment status of loans
Nonaccrual loans	2,851	2,535
Real estate commercial [Member]
Analysis of the payment status of loans
Nonaccrual loans	12,271	20,214
Consumer [Member]
Analysis of the payment status of loans
Nonaccrual loans	505	328
Non-covered [Member]
Analysis of the payment status of loans
30-59 Days Past Due	20,464	21,159
60-89 Days Past Due	5,469	6,051
Nonaccrual loans	50,066	41,938
Current	2,191,635	2,182,809
Total loans	2,267,634	2,251,957
Non-covered [Member] \| Commercial Unsecured [Member]
Analysis of the payment status of loans
30-59 Days Past Due	191	347
60-89 Days Past Due	35	94
Nonaccrual loans	187	222
Current	36,871	36,352
Total loans	37,284	37,015
Non-covered [Member] \| Commercial Secured [Member]
Analysis of the payment status of loans
30-59 Days Past Due	1,003	1,233
60-89 Days Past Due	373	462
Nonaccrual loans	2,927	2,662
Current	102,671	117,923
Total loans	106,974	122,280
Non-covered [Member] \| Secured by Inventory and Accounts Receivable [Member]
Analysis of the payment status of loans
30-59 Days Past Due	30	438
60-89 Days Past Due	225	767
Nonaccrual loans	454	545
Current	21,761	19,426
Total loans	22,470	21,176
Non-covered [Member] \| Real Estate construction, land development and other land loans [Member]
Analysis of the payment status of loans
30-59 Days Past Due	1,950	2,304
60-89 Days Past Due	139	1,391
Nonaccrual loans	7,891	8,055
Current	247,535	232,920
Total loans	257,515	244,670
Non-covered [Member] \| Real estate residential, farmland and mutli-family [Member]
Analysis of the payment status of loans
30-59 Days Past Due	11,272	11,682
60-89 Days Past Due	3,218	2,631
Nonaccrual loans	24,459	17,814
Current	807,884	837,260
Total loans	846,833	869,387
Non-covered [Member] \| Real estate home equity lines of credit [Member]
Analysis of the payment status of loans
30-59 Days Past Due	1,585	1,465
60-89 Days Past Due	352	305
Nonaccrual loans	2,573	2,200
Current	194,067	194,157
Total loans	198,577	198,127
Non-covered [Member] \| Real estate commercial [Member]
Analysis of the payment status of loans
30-59 Days Past Due	3,738	3,196
60-89 Days Past Due	996	214
Nonaccrual loans	11,070	10,115
Current	738,981	696,081
Total loans	754,785	709,606
Non-covered [Member] \| Consumer [Member]
Analysis of the payment status of loans
30-59 Days Past Due	695	494
60-89 Days Past Due	131	187
Nonaccrual loans	505	325
Current	41,865	48,690
Total loans	43,196	49,696
Covered [Member]
Analysis of the payment status of loans
30-59 Days Past Due	4,385	5,179
60-89 Days Past Due	964	768
Nonaccrual loans	10,508	37,217
Current	111,737	167,145
Total Covered Loans - Carrying Value	127,594	210,309
Covered [Member] \| Commercial Unsecured [Member]
Analysis of the payment status of loans
Nonaccrual loans	1	38
Covered [Member] \| Commercial Secured [Member]
Analysis of the payment status of loans
Nonaccrual loans		114
Covered [Member] \| Secured by Inventory and Accounts Receivable [Member]
Analysis of the payment status of loans
Nonaccrual loans	103	782
Covered [Member] \| Real Estate construction, land development and other land loans [Member]
Analysis of the payment status of loans
Nonaccrual loans	1,140	13,502
Covered [Member] \| Real estate residential, farmland and mutli-family [Member]
Analysis of the payment status of loans
Nonaccrual loans	7,785	12,344
Covered [Member] \| Real estate home equity lines of credit [Member]
Analysis of the payment status of loans
Nonaccrual loans	278	335
Covered [Member] \| Real estate commercial [Member]
Analysis of the payment status of loans
Nonaccrual loans	1,201	10,099
Covered [Member] \| Consumer [Member]
Analysis of the payment status of loans
Nonaccrual loans		$ 3

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Aggregate gross carrying amount of loans receivable.

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- Definition

Financing receivables that are less than 60 days past due but more than 29 days past due.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 7A

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Financing receivables that are less than 90 days past due but more than 59 days past due.

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Financing receivables that are current.

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Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 45

-Paragraph 2

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Aggregate gross carrying amount of loans and leases receivable covered by loss sharing agreements.

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