Loans (Summary of Information Related to Impaired Loans) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Schedule representing information related to impaired loans
Average recorded investment related to impaired loans	$ 129,459	$ 127,576
Interest income recognized related to loans with impaired status	1,034	869
Commercial [Member]
Schedule representing information related to impaired loans
Average recorded investment related to impaired loans	41,607	26,953
Interest income recognized related to loans with impaired status	333	193
Real estate commercial [Member]
Schedule representing information related to impaired loans
Average recorded investment related to impaired loans	53,320	56,745
Interest income recognized related to loans with impaired status	361	288
Real estate construction [Member]
Schedule representing information related to impaired loans
Average recorded investment related to impaired loans	167	363
Interest income recognized related to loans with impaired status	0	2
Land development [Member]
Schedule representing information related to impaired loans
Average recorded investment related to impaired loans	4,643	10,914
Interest income recognized related to loans with impaired status	37	91
Real estate residential [Member]
Schedule representing information related to impaired loans
Average recorded investment related to impaired loans	26,781	28,920
Interest income recognized related to loans with impaired status	303	295
Consumer installment [Member]
Schedule representing information related to impaired loans
Average recorded investment related to impaired loans	773	719
Interest income recognized related to loans with impaired status	0	0
Home equity [Member]
Schedule representing information related to impaired loans
Average recorded investment related to impaired loans	2,168	2,962
Interest income recognized related to loans with impaired status	$ 0	$ 0