Loans and Allowance for Loan Losses (Allowance for Loan Losses, by Segment Portfolio) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period	$ 29,314	$ 39,360	$ 93,687
Charge-offs	(13,344)	(30,968)	(128,424)
Recoveries	10,292	6,873	6,735
Provision (Recovery)	523	14,049	67,362
Balance, end of period	26,785	29,314	39,360
Commercial and agricultural [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period	3,238	5,776	11,144
Charge-offs	(1,277)	(3,494)	(10,832)
Recoveries	1,623	991	855
Provision (Recovery)	(653)	(35)	4,609
Balance, end of period	2,931	3,238	5,776
Real estate - construction [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period	4,987	11,995	46,792
Charge-offs	(1,080)	(11,084)	(65,526)
Recoveries	2,681	3,237	2,637
Provision (Recovery)	(1,355)	839	28,092
Balance, end of period	5,233	4,987	11,995
Real estate - mortgage, 1-4 family residential [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period	8,701	8,885	7,742
Charge-offs	(4,032)	(6,422)	(11,384)
Recoveries	1,266	573	831
Provision (Recovery)	2,934	5,665	11,696
Balance, end of period	8,869	8,701	8,885
Real estate - mortgage, commercial [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period	9,627	11,063	26,851
Charge-offs	(2,808)	(5,510)	(36,998)
Recoveries	3,048	852	891
Provision (Recovery)	(2,672)	3,222	20,319
Balance, end of period	7,195	9,627	11,063
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period	2,761	1,641	1,158
Charge-offs	(4,147)	(4,458)	(3,684)
Recoveries	1,674	1,220	1,521
Provision (Recovery)	2,269	4,358	2,646
Balance, end of period	$ 2,557	$ 2,761	$ 1,641