Loans and Asset Quality Information (Schedule of Analysis of Payment Status of Loans) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Analysis of the payment status of loans
30-59 Days Past Due	$ 23,762	$ 24,849
60-89 Days Past Due	5,581	6,433
Nonaccrual loans	56,012	60,574
Current	2,309,261	2,303,372
Total loans	2,275,570	2,268,580	2,256,726
Total Covered Loans - Carrying Value	119,829	127,594	190,551
Loans	2,395,399fbp_Loans	2,396,174fbp_Loans	2,447,277fbp_Loans
Commercial Unsecured [Member]
Analysis of the payment status of loans
Nonaccrual loans	217	188
Commercial Secured [Member]
Analysis of the payment status of loans
Nonaccrual loans	2,998	2,927
Secured by Inventory and Accounts Receivable [Member]
Analysis of the payment status of loans
Nonaccrual loans	683	557
Real Estate construction, land development and other land loans [Member]
Analysis of the payment status of loans
Nonaccrual loans	7,820	9,031
Real estate residential, farmland and mutli-family [Member]
Analysis of the payment status of loans
Nonaccrual loans	28,413	32,244
Real estate home equity lines of credit [Member]
Analysis of the payment status of loans
Nonaccrual loans	2,430	2,851
Real estate commercial [Member]
Analysis of the payment status of loans
Nonaccrual loans	13,120	12,271
Consumer [Member]
Analysis of the payment status of loans
Nonaccrual loans	331	505
Non-covered [Member]
Analysis of the payment status of loans
30-59 Days Past Due	19,403	20,464
60-89 Days Past Due	5,581	5,469
Nonaccrual loans	47,416	50,066
Current	2,202,387	2,191,635
Total loans	2,275,570	2,268,580	2,256,726
Non-covered [Member] \| Commercial Unsecured [Member]
Analysis of the payment status of loans
30-59 Days Past Due	172	191
60-89 Days Past Due	33	35
Nonaccrual loans	217	187
Current	36,102	36,871
Total loans	36,524	37,284
Non-covered [Member] \| Commercial Secured [Member]
Analysis of the payment status of loans
30-59 Days Past Due	1,097	1,003
60-89 Days Past Due	235	373
Nonaccrual loans	2,998	2,927
Current	116,571	102,671
Total loans	120,901	106,974
Non-covered [Member] \| Secured by Inventory and Accounts Receivable [Member]
Analysis of the payment status of loans
30-59 Days Past Due		30
60-89 Days Past Due	21	225
Nonaccrual loans	536	454
Current	23,939	21,761
Total loans	24,496	22,470
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	2,219	1,950
60-89 Days Past Due	1,207	139
Nonaccrual loans	6,796	7,891
Current	246,629	247,535
Total loans	256,851	257,515
Non-covered [Member] \| Real estate residential, farmland and mutli-family [Member]
Analysis of the payment status of loans
30-59 Days Past Due	13,902	11,272
60-89 Days Past Due	2,268	3,218
Nonaccrual loans	23,371	24,459
Current	799,110	807,884
Total loans	838,651	846,833
Non-covered [Member] \| Real estate home equity lines of credit [Member]
Analysis of the payment status of loans
30-59 Days Past Due	497	1,585
60-89 Days Past Due	301	352
Nonaccrual loans	2,140	2,573
Current	196,238	194,067
Total loans	199,176	198,577
Non-covered [Member] \| Real estate commercial [Member]
Analysis of the payment status of loans
30-59 Days Past Due	1,171	3,738
60-89 Days Past Due	1,318	996
Nonaccrual loans	11,027	11,070
Current	743,502	738,981
Total loans	757,018	754,785
Non-covered [Member] \| Consumer [Member]
Analysis of the payment status of loans
30-59 Days Past Due	345	695
60-89 Days Past Due	198	131
Nonaccrual loans	331	505
Current	40,296	41,865
Total loans	41,170	43,196
Covered [Member]
Analysis of the payment status of loans
30-59 Days Past Due	4,359	4,385
60-89 Days Past Due		964
Nonaccrual loans	8,596	10,508
Current	106,874	111,737
Total Covered Loans - Carrying Value	119,829	127,594	190,551
Covered [Member] \| Commercial Unsecured [Member]
Analysis of the payment status of loans
Nonaccrual loans		1
Covered [Member] \| Commercial Secured [Member]
Analysis of the payment status of loans
Nonaccrual loans
Covered [Member] \| Secured by Inventory and Accounts Receivable [Member]
Analysis of the payment status of loans
Nonaccrual loans	147	103
Covered [Member] \| Real Estate construction, land development and other land loans [Member]
Analysis of the payment status of loans
Nonaccrual loans	1,024	1,140
Covered [Member] \| Real estate residential, farmland and mutli-family [Member]
Analysis of the payment status of loans
Nonaccrual loans	5,042	7,785
Covered [Member] \| Real estate home equity lines of credit [Member]
Analysis of the payment status of loans
Nonaccrual loans	290	278
Covered [Member] \| Real estate commercial [Member]
Analysis of the payment status of loans
Nonaccrual loans	2,093	1,201
Covered [Member] \| Consumer [Member]
Analysis of the payment status of loans
Nonaccrual loans

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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.

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

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-Name Accounting Standards Codification

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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

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-Name Accounting Standards Codification

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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

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-Name Accounting Standards Codification

-Topic 310

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

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