Loans and Asset Quality Information (Details 8) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Provisions	$ 3,659	$ 5,591	$ 7,234	$ 16,740
Loans receivable:
Loans - non-covered	2,257,530	2,190,583	2,257,530	2,190,583	2,252,885
Non-covered [Member]
Beginning balance	44,706	44,761	44,263	41,643	41,643
Charge-offs	(4,254)	(4,546)	(7,722)	(9,341)	(19,383)
Recoveries	356	558	902	2,700	3,737
Provisions	1,158	4,043	4,523	9,814	18,266
Ending balance	41,966	44,816	41,966	44,816	44,263
Ending balances: Allowance for loan losses
Individually evaluated for impairment	3,652	3,538	3,652	3,538	2,559
Collectively evaluated for impairment	38,314	41,278	38,314	41,278	41,704
Loans receivable:
Loans - non-covered	2,256,879	2,189,415	2,256,879	2,189,415	2,251,957
Ending balances: Loans
Individually evaluated for impairment	48,227	46,217	48,227	46,217	44,649
Collectively evaluated for impairment	2,208,652	2,143,198	2,208,652	2,143,198	2,207,308
Commercial, financial and agricultural [Member]
Beginning balance	8,889	4,949	7,432	4,687	4,687
Charge-offs	(2,041)	(560)	(2,666)	(1,384)	(4,418)
Recoveries	21	214	49	233	299
Provisions	2,079	1,357	4,133	2,424	6,864
Ending balance	8,948	5,960	8,948	5,960	7,432
Ending balances: Allowance for loan losses
Individually evaluated for impairment	290	902	290	902	202
Collectively evaluated for impairment	8,658	5,058	8,658	5,058	7,230
Loans receivable:
Loans - non-covered	178,670	176,662	178,670	176,662	180,471
Ending balances: Loans
Individually evaluated for impairment	679	1,920	679	1,920	582
Collectively evaluated for impairment	177,991	174,742	177,991	174,742	179,889
Real Estate construction, land development and other land loans [Member]
Beginning balance	8,650	14,857	12,966	12,856	12,856
Charge-offs	(307)	(394)	(1,234)	(1,217)	(2,739)
Recoveries	73	24	309	617	743
Provisions	(1,002)	106	(4,627)	2,337	2,106
Ending balance	7,414	14,593	7,414	14,593	12,966
Ending balances: Allowance for loan losses
Individually evaluated for impairment	818	480	818	480	544
Collectively evaluated for impairment	6,596	14,113	6,596	14,113	12,422
Loans receivable:
Loans - non-covered	247,369	232,352	247,369	232,352	244,670
Ending balances: Loans
Individually evaluated for impairment	7,541	7,596	7,541	7,596	8,027
Collectively evaluated for impairment	239,828	224,756	239,828	224,756	236,643
Real estate residential, farmland and mutli-family [Member]
Beginning balance	12,733	15,285	15,142	14,082	14,082
Charge-offs	(861)	(858)	(1,631)	(1,655)	(3,732)
Recoveries	114	117	179	663	753
Provisions	(854)	417	(2,558)	1,871	4,039
Ending balance	11,132	14,961	11,132	14,961	15,142
Ending balances: Allowance for loan losses
Individually evaluated for impairment	2,016	1,373	2,016	1,373	1,162
Collectively evaluated for impairment	9,116	13,588	9,116	13,588	13,980
Loans receivable:
Loans - non-covered	867,175	850,060	867,175	850,060	869,387
Ending balances: Loans
Individually evaluated for impairment	22,505	19,080	22,505	19,080	19,111
Collectively evaluated for impairment	844,670	830,980	844,670	830,980	850,276
Real estate residential, farmland and mutli-family [Member] | Non-covered [Member]
Loans receivable:
Loans - non-covered	867,175		867,175		869,387
Real estate home equity lines of credit [Member]
Beginning balance	3,662	2,040	1,838	1,884	1,884
Charge-offs	(397)	(265)	(503)	(889)	(1,314)
Recoveries	6	4	11	62	87
Provisions	484	282	2,409	1,004	1,181
Ending balance	3,755	2,061	3,755	2,061	1,838
Ending balances: Allowance for loan losses
Individually evaluated for impairment		1		1	1
Collectively evaluated for impairment	3,755	2,060	3,755	2,060	1,837
Loans receivable:
Loans - non-covered	200,510	198,281	200,510	198,281	198,127
Ending balances: Loans
Individually evaluated for impairment	483	22	483	22	22
Collectively evaluated for impairment	200,027	198,259	200,027	198,259	198,105
Real estate home equity lines of credit [Member] | Non-covered [Member]
Loans receivable:
Loans - non-covered	200,510		200,510		198,127
Real estate mortgage commercial and other [Member]
Beginning balance	9,375	5,714	5,524	5,247	5,247
Charge-offs	(277)	(1,907)	(889)	(2,447)	(4,346)
Recoveries	26	93	121	882	1,381
Provisions	88	1,339	4,456	1,557	3,242
Ending balance	9,212	5,239	9,212	5,239	5,524
Ending balances: Allowance for loan losses
Individually evaluated for impairment	528	781	528	781	649
Collectively evaluated for impairment	8,684	4,458	8,684	4,458	4,875
Loans receivable:
Loans - non-covered	717,905	680,607	717,905	680,607	709,606
Ending balances: Loans
Individually evaluated for impairment	17,009	17,585	17,009	17,585	16,894
Collectively evaluated for impairment	700,896	663,022	700,896	663,022	692,712
Consumer [Member]
Beginning balance	1,030	1,791	1,513	1,939	1,939
Charge-offs	(371)	(562)	(799)	(1,090)	(2,174)
Recoveries	116	106	233	243	474
Provisions	131	368	(41)	611	1,274
Ending balance	906	1,703	906	1,703	1,513
Ending balances: Allowance for loan losses
Individually evaluated for impairment		1		1	1
Collectively evaluated for impairment	906	1,702	906	1,702	1,512
Loans receivable:
Loans - non-covered	45,250	51,453	45,250	51,453	49,696
Ending balances: Loans
Individually evaluated for impairment	10	14	10	14	13
Collectively evaluated for impairment	45,240	51,439	45,240	51,439	49,683
Consumer [Member] | Non-covered [Member]
Loans receivable:
Loans - non-covered	45,250		45,250		49,696
Unallocated [Member]
Beginning balance	367	125	(152)	948	948
Charge-offs				(659)	(660)
Recoveries
Provisions	232	174	751	10	(440)
Ending balance	599	299	599	299	(152)
Ending balances: Allowance for loan losses
Collectively evaluated for impairment	$ 599	$ 299	$ 599	$ 299	$ (152)