Loans (Summary of Information Related to Impaired Loans) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Schedule representing information related to impaired loans
Average recorded investment related to impaired loans	$ 138,197	$ 124,375	$ 133,845	$ 127,263
Interest income recognized related to loans with impaired status	1,213	949	3,545	3,058
Commercial [Member]
Schedule representing information related to impaired loans
Average recorded investment related to impaired loans	42,847	41,903	39,387	42,046
Interest income recognized related to loans with impaired status	310	346	862	1,026
Real estate commercial [Member]
Schedule representing information related to impaired loans
Average recorded investment related to impaired loans	59,150	50,133	59,927	51,571
Interest income recognized related to loans with impaired status	470	263	1,453	990
Real estate construction [Member]
Schedule representing information related to impaired loans
Average recorded investment related to impaired loans	445	162	491	164
Interest income recognized related to loans with impaired status	3	0	5	0
Land development [Member]
Schedule representing information related to impaired loans
Average recorded investment related to impaired loans	1,765	3,284	1,847	4,079
Interest income recognized related to loans with impaired status	23	30	84	101
Real estate residential [Member]
Schedule representing information related to impaired loans
Average recorded investment related to impaired loans	30,467	26,166	29,084	26,561
Interest income recognized related to loans with impaired status	387	310	1,098	941
Consumer installment [Member]
Schedule representing information related to impaired loans
Average recorded investment related to impaired loans	497	481	474	630
Interest income recognized related to loans with impaired status	0	0	1	0
Home equity [Member]
Schedule representing information related to impaired loans
Average recorded investment related to impaired loans	3,026	2,246	2,635	2,212
Interest income recognized related to loans with impaired status	$ 20	$ 0	$ 42	$ 0

Schedule representing information related to impaired loans.

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- Definition

Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5212-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 17

-URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5258-111524

+ Details

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- Definition

Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

+ References

+ Details

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