Loans and Allowance for Loan Losses (Allowance for Loan Losses, by Segment Portfolio) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period	$ 19,008	$ 26,039	$ 20,345	$ 26,785
Charge-offs	(1,567)	(2,033)	(2,562)	(4,010)
Recoveries	1,336	1,654	2,132	3,569
Provision (recovery of provision)	(788)	(1,685)	(1,926)	(2,369)
Balance, end of period	17,989	23,975	17,989	23,975
Commercial and agricultural [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period	3,398	3,441	3,915	2,931
Charge-offs	(257)	(621)	(306)	(1,010)
Recoveries	428	262	649	654
Provision (recovery of provision)	(857)	426	(1,546)	933
Balance, end of period	2,712	3,508	2,712	3,508
Real estate - construction [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period	3,120	5,308	3,163	5,233
Charge-offs	(4)	(91)	(85)	(624)
Recoveries	179	363	375	1,327
Provision (recovery of provision)	(1,088)	(802)	(1,246)	(1,158)
Balance, end of period	2,207	4,778	2,207	4,778
Real estate - mortgage, 1-4 family residential [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period	5,623	7,923	5,847	8,869
Charge-offs	(251)	(151)	(376)	(635)
Recoveries	171	263	309	498
Provision (recovery of provision)	(26)	(625)	(263)	(1,322)
Balance, end of period	5,517	7,410	5,517	7,410
Real estate - mortgage, commercial [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period	3,152	6,966	4,179	7,195
Charge-offs	(261)	(730)	(268)	(796)
Recoveries	328	527	386	593
Provision (recovery of provision)	87	(1,097)	(991)	(1,326)
Balance, end of period	3,306	5,666	3,306	5,666
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period	3,715	2,401	3,241	2,557
Charge-offs	(794)	(440)	(1,527)	(945)
Recoveries	230	239	413	497
Provision (recovery of provision)	1,096	413	2,120	504
Balance, end of period	$ 4,247	$ 2,613	$ 4,247	$ 2,613