Loans (Summary of Information Related to Impaired Loans) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Schedule representing information related to impaired loans
Average recorded investment related to impaired loans	$ 131,805	$ 127,956	$ 131,670	$ 128,707
Interest income recognized related to loans with impaired status	1,152	1,075	2,332	2,109
Commercial [Member]
Schedule representing information related to impaired loans
Average recorded investment related to impaired loans	36,735	42,629	37,655	42,118
Interest income recognized related to loans with impaired status	263	347	552	680
Real estate commercial [Member]
Schedule representing information related to impaired loans
Average recorded investment related to impaired loans	60,393	51,260	60,317	52,290
Interest income recognized related to loans with impaired status	458	366	983	727
Real estate construction [Member]
Schedule representing information related to impaired loans
Average recorded investment related to impaired loans	390	163	515	165
Interest income recognized related to loans with impaired status	2	0	2	0
Land development [Member]
Schedule representing information related to impaired loans
Average recorded investment related to impaired loans	1,900	4,312	1,888	4,478
Interest income recognized related to loans with impaired status	34	34	61	71
Real estate residential [Member]
Schedule representing information related to impaired loans
Average recorded investment related to impaired loans	29,432	26,737	28,392	26,758
Interest income recognized related to loans with impaired status	380	328	711	631
Consumer installment [Member]
Schedule representing information related to impaired loans
Average recorded investment related to impaired loans	426	634	463	704
Interest income recognized related to loans with impaired status	1	0	1	0
Home equity [Member]
Schedule representing information related to impaired loans
Average recorded investment related to impaired loans	2,529	2,221	2,440	2,194
Interest income recognized related to loans with impaired status	$ 14	$ 0	$ 22	$ 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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