Loans and Asset Quality Information (Schedule of Activity in Allowance for Loan Losses for Non-Covered Loans) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Provisions	$ 10,195	$ 30,616	$ 79,672
Loans receivable:
Ending balance - total	2,395,228	2,462,266
Unamortized net deferred loan costs	946	928
Total non-covered loans	2,268,580	2,252,885
Non-covered [Member]
Beginning balance	44,263	41,643
Charge-offs	(16,288)	(19,383)
Recoveries	1,546	3,737
Transfers from covered category	1,737
Provisions	7,087	18,266
Ending balance	38,345	44,263
Ending balances: Allowance for loan losses
Individually evaluated for impairment	2,477	2,559
Collectively evaluated for impairment	35,868	41,704
Loans acquired with deteriorated credit quality
Loans receivable:
Ending balance - total	2,267,634	2,251,957
Unamortized net deferred loan costs	946	923
Total non-covered loans	2,267,634	2,251,957
Ending balances: Loans
Individually evaluated for impairment	53,531	44,649
Collectively evaluated for impairment	2,213,456	2,207,308
Loans acquired with deteriorated credit quality	647
Commercial, financial and agricultural [Member]
Beginning balance	7,432	4,687
Charge-offs	(4,039)	(4,418)
Recoveries	140	299
Transfers from covered category	36
Provisions	4,822	6,864
Ending balance	8,391	7,432
Ending balances: Allowance for loan losses
Individually evaluated for impairment	211	202
Collectively evaluated for impairment	8,180	7,230
Loans acquired with deteriorated credit quality
Loans receivable:
Ending balance - total	160,878	168,469
Ending balances: Loans
Individually evaluated for impairment	784	582
Collectively evaluated for impairment	165,944	179,889
Loans acquired with deteriorated credit quality
Commercial, financial and agricultural [Member] \| Non-covered [Member]
Loans receivable:
Ending balance - total	166,728	180,471
Real Estate construction, land development and other land loans [Member]
Beginning balance	12,966	12,856
Charge-offs	(2,148)	(2,739)
Recoveries	398	743
Transfers from covered category	813
Provisions	(5,559)	2,106
Ending balance	6,470	12,966
Ending balances: Allowance for loan losses
Individually evaluated for impairment	415	544
Collectively evaluated for impairment	6,055	12,422
Loans acquired with deteriorated credit quality
Loans receivable:
Ending balance - total	288,148	305,246
Ending balances: Loans
Individually evaluated for impairment	7,991	8,027
Collectively evaluated for impairment	249,524	236,643
Loans acquired with deteriorated credit quality
Real Estate construction, land development and other land loans [Member] \| Non-covered [Member]
Loans receivable:
Ending balance - total	257,515	244,670
Real estate residential, farmland and mutli-family [Member]
Beginning balance	15,142	14,082
Charge-offs	(4,417)	(3,732)
Recoveries	331	753
Transfers from covered category	51
Provisions	(1,387)	4,039
Ending balance	9,720	15,142
Ending balances: Allowance for loan losses
Individually evaluated for impairment	1,686	1,162
Collectively evaluated for impairment	8,034	13,980
Loans acquired with deteriorated credit quality
Ending balances: Loans
Individually evaluated for impairment	24,010	19,111
Collectively evaluated for impairment	822,823	850,276
Loans acquired with deteriorated credit quality
Real estate residential, farmland and mutli-family [Member] \| Non-covered [Member]
Loans receivable:
Ending balance - total	846,833	869,387
Total non-covered loans	846,833	869,387
Real estate home equity lines of credit [Member]
Beginning balance	1,838	1,884
Charge-offs	(912)	(1,314)
Recoveries	45	87
Transfers from covered category
Provisions	2,760	1,181
Ending balance	3,731	1,838
Ending balances: Allowance for loan losses
Individually evaluated for impairment		1
Collectively evaluated for impairment	3,731	1,837
Loans acquired with deteriorated credit quality
Ending balances: Loans
Individually evaluated for impairment	476	22
Collectively evaluated for impairment	198,101	198,105
Loans acquired with deteriorated credit quality
Real estate home equity lines of credit [Member] \| Non-covered [Member]
Loans receivable:
Ending balance - total	198,577	198,127
Total non-covered loans	198,577	198,127
Real estate mortgage commercial and other [Member]
Beginning balance	5,524	5,247
Charge-offs	(3,048)	(4,346)
Recoveries	181	1,381
Transfers from covered category	833
Provisions	5,555	3,242
Ending balance	9,045	5,524
Ending balances: Allowance for loan losses
Individually evaluated for impairment	165	649
Collectively evaluated for impairment	8,880	4,875
Loans acquired with deteriorated credit quality
Loans receivable:
Ending balance - total	882,127	855,249
Ending balances: Loans
Individually evaluated for impairment	20,263	16,894
Collectively evaluated for impairment	733,875	692,712
Loans acquired with deteriorated credit quality	647
Real estate mortgage commercial and other [Member] \| Non-covered [Member]
Loans receivable:
Ending balance - total	754,785	709,606
Consumer [Member]
Beginning balance	1,513	1,939
Charge-offs	(1,724)	(2,174)
Recoveries	451	474
Transfers from covered category	4
Provisions	597	1,274
Ending balance	841	1,513
Ending balances: Allowance for loan losses
Individually evaluated for impairment		1
Collectively evaluated for impairment	841	1,512
Loans acquired with deteriorated credit quality
Ending balances: Loans
Individually evaluated for impairment	7	13
Collectively evaluated for impairment	43,189	49,683
Loans acquired with deteriorated credit quality
Consumer [Member] \| Non-covered [Member]
Loans receivable:
Ending balance - total	43,196	49,696
Total non-covered loans	43,196	49,696
Unallocated [Member]
Beginning balance	(152)	948
Charge-offs		(660)
Recoveries
Transfers from covered category
Provisions	299	(440)
Ending balance	147	(152)
Ending balances: Allowance for loan losses
Individually evaluated for impairment
Collectively evaluated for impairment	147	(152)
Loans acquired with deteriorated credit quality
Ending balances: Loans
Individually evaluated for impairment
Collectively evaluated for impairment
Loans acquired with deteriorated credit quality
Unallocated [Member] \| Non-covered [Member]
Loans receivable:
Ending balance - total

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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.

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