Allowance for Loan Losses, Nonperforming Assets and Impaired Loans, Non-impaired Loans by Credit Quality Indicator (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended																																																																			12 Months Ended																																																																		12 Months Ended
	Dec. 31, 2012	Dec. 31, 2012 Pass [Member]	Dec. 31, 2012 Pass [Member] Scenario, Previously Reported [Member]	Dec. 31, 2011 Pass [Member] Scenario, Previously Reported [Member]		Dec. 31, 2011 Pass [Member] Commercial and Industrial [Member] Scenario, Previously Reported [Member]		Dec. 31, 2012 Pass [Member] Real Estate Construction [Member] Construction, 1-4 Family Residential [Member]	Dec. 31, 2012 Pass [Member] Real Estate Construction [Member] Construction, Other [Member]	Dec. 31, 2012 Pass [Member] Real Estate Construction [Member] Construction, Other [Member] Scenario, Previously Reported [Member]	Dec. 31, 2012 Pass [Member] Consumer Real Estate [Member] Equity Lines [Member]	Dec. 31, 2011 Pass [Member] Consumer Real Estate [Member] Equity Lines [Member] Scenario, Previously Reported [Member]		Dec. 31, 2011 Pass [Member] Consumer Real Estate [Member] Closed end Consumer Real Estate [Member] Scenario, Previously Reported [Member]		Dec. 31, 2011 Pass [Member] Consumer Real Estate [Member] Consumer Construction [Member] Scenario, Previously Reported [Member]		Dec. 31, 2012 Pass [Member] Consumer Real Estate [Member] Closed-end First Liens [Member]	Dec. 31, 2012 Pass [Member] Consumer Real Estate [Member] Closed-end Junior Liens [Member]	Dec. 31, 2012 Pass [Member] Commercial Real Estate [Member] Commercial Real Estate, Other [Member]	Dec. 31, 2011 Pass [Member] Commercial Real Estate [Member] Commercial Real Estate, Other [Member] Scenario, Previously Reported [Member]		Dec. 31, 2012 Pass [Member] Commercial Real Estate [Member] Commercial Real Estate, Owner Occupied [Member]	Dec. 31, 2012 Pass [Member] Commercial Real Estate [Member] Commercial Real Estate, Owner Occupied [Member] Scenario, Previously Reported [Member]	Dec. 31, 2011 Pass [Member] Commercial Real Estate [Member] College Housing [Member] Scenario, Previously Reported [Member]		Dec. 31, 2011 Pass [Member] Commercial Real Estate [Member] Office/Retail [Member] Scenario, Previously Reported [Member]		Dec. 31, 2011 Pass [Member] Commercial Real Estate [Member] Nursing Homes [Member] Scenario, Previously Reported [Member]		Dec. 31, 2011 Pass [Member] Commercial Real Estate [Member] Hotels [Member] Scenario, Previously Reported [Member]		Dec. 31, 2011 Pass [Member] Commercial Real Estate [Member] Municipalities [Member] Scenario, Previously Reported [Member]		Dec. 31, 2012 Pass [Member] Commercial Real Estate [Member] Multifamily Real Estate [Member]	Dec. 31, 2012 Pass [Member] Commercial Real Estate [Member] Multifamily Real Estate [Member] Scenario, Previously Reported [Member]	Dec. 31, 2011 Pass [Member] Commercial Real Estate [Member] Medical Professionals [Member] Scenario, Previously Reported [Member]		Dec. 31, 2011 Pass [Member] Commercial Real Estate [Member] Religious Organizations [Member] Scenario, Previously Reported [Member]		Dec. 31, 2011 Pass [Member] Commercial Real Estate [Member] Convenience Stores [Member] Scenario, Previously Reported [Member]		Dec. 31, 2011 Pass [Member] Commercial Real Estate [Member] Entertainment and Sports [Member] Scenario, Previously Reported [Member]		Dec. 31, 2011 Pass [Member] Commercial Real Estate [Member] Nonprofits [Member] Scenario, Previously Reported [Member]		Dec. 31, 2011 Pass [Member] Commercial Real Estate [Member] Restaurants [Member] Scenario, Previously Reported [Member]		Dec. 31, 2011 Pass [Member] Commercial Real Estate [Member] General Contractors [Member] Scenario, Previously Reported [Member]		Dec. 31, 2012 Pass [Member] Commercial Non Real Estate [Member] Commercial and Industrial [Member]	Dec. 31, 2012 Pass [Member] Commercial Non Real Estate [Member] Commercial and Industrial [Member] Scenario, Previously Reported [Member]	Dec. 31, 2012 Pass [Member] Public Sector and IDA [Member] States & Political Subdivisions [Member]	Dec. 31, 2012 Pass [Member] Consumer Non Real Estate [Member] Automobile [Member]	Dec. 31, 2012 Pass [Member] Consumer Non Real Estate [Member] Automobile [Member] Scenario, Previously Reported [Member]	Dec. 31, 2012 Pass [Member] Consumer Non Real Estate [Member] Other Consumer [Member]	Dec. 31, 2012 Pass [Member] Consumer Non Real Estate [Member] Credit Cards [Member]	Dec. 31, 2011 Pass [Member] Consumer Non Real Estate [Member] Credit Cards [Member] Scenario, Previously Reported [Member]		Dec. 31, 2011 Pass [Member] Consumer Non Real Estate [Member] Consumer General [Member] Scenario, Previously Reported [Member]		Dec. 31, 2011 Pass [Member] Consumer Non Real Estate [Member] Consumer Overdraft [Member] Scenario, Previously Reported [Member]		Dec. 31, 2011 Pass [Member] Construction Development and Other land [Member] Residential [Member] Scenario, Previously Reported [Member]		Dec. 31, 2011 Pass [Member] Construction Development and Other land [Member] Commercial [Member] Scenario, Previously Reported [Member]		Dec. 31, 2012 Special Mention [Member]	Dec. 31, 2012 Special Mention [Member] Scenario, Previously Reported [Member]	Dec. 31, 2011 Special Mention [Member] Scenario, Previously Reported [Member]		Dec. 31, 2011 Special Mention [Member] Commercial and Industrial [Member] Scenario, Previously Reported [Member]		Dec. 31, 2012 Special Mention [Member] Real Estate Construction [Member] Construction, 1-4 Family Residential [Member]	Dec. 31, 2012 Special Mention [Member] Real Estate Construction [Member] Construction, Other [Member]	Dec. 31, 2012 Special Mention [Member] Real Estate Construction [Member] Construction, Other [Member] Scenario, Previously Reported [Member]	Dec. 31, 2012 Special Mention [Member] Consumer Real Estate [Member] Equity Lines [Member]	Dec. 31, 2011 Special Mention [Member] Consumer Real Estate [Member] Equity Lines [Member] Scenario, Previously Reported [Member]		Dec. 31, 2011 Special Mention [Member] Consumer Real Estate [Member] Closed end Consumer Real Estate [Member] Scenario, Previously Reported [Member]		Dec. 31, 2011 Special Mention [Member] Consumer Real Estate [Member] Consumer Construction [Member] Scenario, Previously Reported [Member]		Dec. 31, 2012 Special Mention [Member] Consumer Real Estate [Member] Closed-end First Liens [Member]	Dec. 31, 2012 Special Mention [Member] Consumer Real Estate [Member] Closed-end Junior Liens [Member]	Dec. 31, 2012 Special Mention [Member] Commercial Real Estate [Member] Commercial Real Estate, Other [Member]	Dec. 31, 2011 Special Mention [Member] Commercial Real Estate [Member] Commercial Real Estate, Other [Member] Scenario, Previously Reported [Member]		Dec. 31, 2012 Special Mention [Member] Commercial Real Estate [Member] Commercial Real Estate, Owner Occupied [Member]	Dec. 31, 2012 Special Mention [Member] Commercial Real Estate [Member] Commercial Real Estate, Owner Occupied [Member] Scenario, Previously Reported [Member]	Dec. 31, 2011 Special Mention [Member] Commercial Real Estate [Member] College Housing [Member] Scenario, Previously Reported [Member]		Dec. 31, 2011 Special Mention [Member] Commercial Real Estate [Member] Office/Retail [Member] Scenario, Previously Reported [Member]		Dec. 31, 2011 Special Mention [Member] Commercial Real Estate [Member] Nursing Homes [Member] Scenario, Previously Reported [Member]		Dec. 31, 2011 Special Mention [Member] Commercial Real Estate [Member] Hotels [Member] Scenario, Previously Reported [Member]		Dec. 31, 2011 Special Mention [Member] Commercial Real Estate [Member] Municipalities [Member] Scenario, Previously Reported [Member]		Dec. 31, 2012 Special Mention [Member] Commercial Real Estate [Member] Multifamily Real Estate [Member]	Dec. 31, 2012 Special Mention [Member] Commercial Real Estate [Member] Multifamily Real Estate [Member] Scenario, Previously Reported [Member]	Dec. 31, 2011 Special Mention [Member] Commercial Real Estate [Member] Medical Professionals [Member] Scenario, Previously Reported [Member]		Dec. 31, 2011 Special Mention [Member] Commercial Real Estate [Member] Religious Organizations [Member] Scenario, Previously Reported [Member]		Dec. 31, 2011 Special Mention [Member] Commercial Real Estate [Member] Convenience Stores [Member] Scenario, Previously Reported [Member]		Dec. 31, 2011 Special Mention [Member] Commercial Real Estate [Member] Entertainment and Sports [Member] Scenario, Previously Reported [Member]		Dec. 31, 2011 Special Mention [Member] Commercial Real Estate [Member] Nonprofits [Member] Scenario, Previously Reported [Member]		Dec. 31, 2011 Special Mention [Member] Commercial Real Estate [Member] Restaurants [Member] Scenario, Previously Reported [Member]		Dec. 31, 2011 Special Mention [Member] Commercial Real Estate [Member] General Contractors [Member] Scenario, Previously Reported [Member]		Dec. 31, 2012 Special Mention [Member] Commercial Non Real Estate [Member] Commercial and Industrial [Member]	Dec. 31, 2012 Special Mention [Member] Commercial Non Real Estate [Member] Commercial and Industrial [Member] Scenario, Previously Reported [Member]	Dec. 31, 2012 Special Mention [Member] Public Sector and IDA [Member] States & Political Subdivisions [Member]	Dec. 31, 2012 Special Mention [Member] Consumer Non Real Estate [Member] Automobile [Member]	Dec. 31, 2012 Special Mention [Member] Consumer Non Real Estate [Member] Automobile [Member] Scenario, Previously Reported [Member]	Dec. 31, 2012 Special Mention [Member] Consumer Non Real Estate [Member] Other Consumer [Member]	Dec. 31, 2012 Special Mention [Member] Consumer Non Real Estate [Member] Credit Cards [Member]	Dec. 31, 2011 Special Mention [Member] Consumer Non Real Estate [Member] Credit Cards [Member] Scenario, Previously Reported [Member]		Dec. 31, 2011 Special Mention [Member] Consumer Non Real Estate [Member] Consumer General [Member] Scenario, Previously Reported [Member]		Dec. 31, 2011 Special Mention [Member] Consumer Non Real Estate [Member] Consumer Overdraft [Member] Scenario, Previously Reported [Member]		Dec. 31, 2011 Special Mention [Member] Construction Development and Other land [Member] Residential [Member] Scenario, Previously Reported [Member]		Dec. 31, 2011 Special Mention [Member] Construction Development and Other land [Member] Commercial [Member] Scenario, Previously Reported [Member]		Dec. 31, 2012 Classified (Excluding Impaired) [Member]	Dec. 31, 2012 Classified (Excluding Impaired) [Member] Scenario, Previously Reported [Member]	Dec. 31, 2011 Classified (Excluding Impaired) [Member] Scenario, Previously Reported [Member]		Dec. 31, 2011 Classified (Excluding Impaired) [Member] Commercial and Industrial [Member] Scenario, Previously Reported [Member]		Dec. 31, 2012 Classified (Excluding Impaired) [Member] Real Estate Construction [Member] Construction, 1-4 Family Residential [Member]	Dec. 31, 2012 Classified (Excluding Impaired) [Member] Real Estate Construction [Member] Construction, Other [Member]	Dec. 31, 2012 Classified (Excluding Impaired) [Member] Real Estate Construction [Member] Construction, Other [Member] Scenario, Previously Reported [Member]	Dec. 31, 2012 Classified (Excluding Impaired) [Member] Consumer Real Estate [Member] Equity Lines [Member]	Dec. 31, 2011 Classified (Excluding Impaired) [Member] Consumer Real Estate [Member] Equity Lines [Member] Scenario, Previously Reported [Member]		Dec. 31, 2011 Classified (Excluding Impaired) [Member] Consumer Real Estate [Member] Closed end Consumer Real Estate [Member] Scenario, Previously Reported [Member]		Dec. 31, 2011 Classified (Excluding Impaired) [Member] Consumer Real Estate [Member] Consumer Construction [Member] Scenario, Previously Reported [Member]		Dec. 31, 2012 Classified (Excluding Impaired) [Member] Consumer Real Estate [Member] Closed-end First Liens [Member]	Dec. 31, 2012 Classified (Excluding Impaired) [Member] Consumer Real Estate [Member] Closed-end Junior Liens [Member]	Dec. 31, 2012 Classified (Excluding Impaired) [Member] Commercial Real Estate [Member] Commercial Real Estate, Other [Member]	Dec. 31, 2011 Classified (Excluding Impaired) [Member] Commercial Real Estate [Member] Commercial Real Estate, Other [Member] Scenario, Previously Reported [Member]		Dec. 31, 2012 Classified (Excluding Impaired) [Member] Commercial Real Estate [Member] Commercial Real Estate, Owner Occupied [Member]	Dec. 31, 2012 Classified (Excluding Impaired) [Member] Commercial Real Estate [Member] Commercial Real Estate, Owner Occupied [Member] Scenario, Previously Reported [Member]	Dec. 31, 2011 Classified (Excluding Impaired) [Member] Commercial Real Estate [Member] College Housing [Member] Scenario, Previously Reported [Member]		Dec. 31, 2011 Classified (Excluding Impaired) [Member] Commercial Real Estate [Member] Office/Retail [Member] Scenario, Previously Reported [Member]		Dec. 31, 2011 Classified (Excluding Impaired) [Member] Commercial Real Estate [Member] Nursing Homes [Member] Scenario, Previously Reported [Member]		Dec. 31, 2011 Classified (Excluding Impaired) [Member] Commercial Real Estate [Member] Hotels [Member] Scenario, Previously Reported [Member]		Dec. 31, 2011 Classified (Excluding Impaired) [Member] Commercial Real Estate [Member] Municipalities [Member] Scenario, Previously Reported [Member]		Dec. 31, 2012 Classified (Excluding Impaired) [Member] Commercial Real Estate [Member] Multifamily Real Estate [Member]	Dec. 31, 2012 Classified (Excluding Impaired) [Member] Commercial Real Estate [Member] Multifamily Real Estate [Member] Scenario, Previously Reported [Member]	Dec. 31, 2011 Classified (Excluding Impaired) [Member] Commercial Real Estate [Member] Medical Professionals [Member] Scenario, Previously Reported [Member]		Dec. 31, 2011 Classified (Excluding Impaired) [Member] Commercial Real Estate [Member] Religious Organizations [Member] Scenario, Previously Reported [Member]		Dec. 31, 2011 Classified (Excluding Impaired) [Member] Commercial Real Estate [Member] Convenience Stores [Member] Scenario, Previously Reported [Member]		Dec. 31, 2011 Classified (Excluding Impaired) [Member] Commercial Real Estate [Member] Entertainment and Sports [Member] Scenario, Previously Reported [Member]		Dec. 31, 2011 Classified (Excluding Impaired) [Member] Commercial Real Estate [Member] Nonprofits [Member] Scenario, Previously Reported [Member]		Dec. 31, 2011 Classified (Excluding Impaired) [Member] Commercial Real Estate [Member] Restaurants [Member] Scenario, Previously Reported [Member]		Dec. 31, 2011 Classified (Excluding Impaired) [Member] Commercial Real Estate [Member] General Contractors [Member] Scenario, Previously Reported [Member]		Dec. 31, 2012 Classified (Excluding Impaired) [Member] Commercial Non Real Estate [Member] Commercial and Industrial [Member]	Dec. 31, 2012 Classified (Excluding Impaired) [Member] Commercial Non Real Estate [Member] Commercial and Industrial [Member] Scenario, Previously Reported [Member]	Dec. 31, 2012 Classified (Excluding Impaired) [Member] Public Sector and IDA [Member] States & Political Subdivisions [Member]	Dec. 31, 2012 Classified (Excluding Impaired) [Member] Consumer Non Real Estate [Member] Automobile [Member]	Dec. 31, 2012 Classified (Excluding Impaired) [Member] Consumer Non Real Estate [Member] Automobile [Member] Scenario, Previously Reported [Member]	Dec. 31, 2012 Classified (Excluding Impaired) [Member] Consumer Non Real Estate [Member] Other Consumer [Member]	Dec. 31, 2012 Classified (Excluding Impaired) [Member] Consumer Non Real Estate [Member] Credit Cards [Member]	Dec. 31, 2011 Classified (Excluding Impaired) [Member] Consumer Non Real Estate [Member] Credit Cards [Member] Scenario, Previously Reported [Member]		Dec. 31, 2011 Classified (Excluding Impaired) [Member] Consumer Non Real Estate [Member] Consumer General [Member] Scenario, Previously Reported [Member]		Dec. 31, 2011 Classified (Excluding Impaired) [Member] Consumer Non Real Estate [Member] Consumer Overdraft [Member] Scenario, Previously Reported [Member]		Dec. 31, 2011 Classified (Excluding Impaired) [Member] Construction Development and Other land [Member] Residential [Member] Scenario, Previously Reported [Member]		Dec. 31, 2011 Classified (Excluding Impaired) [Member] Construction Development and Other land [Member] Commercial [Member] Scenario, Previously Reported [Member]
Financing Receivable, Recorded Investment [Line Items]
Threshold period for considering loans as special mention or classified	75 days
Increase in percentage of allocation for internal and external factors used for estimating credit risk for non-impaired loans (in hundredths)																																																																				50.00%																																																																		100.00%
Non-impaired loans		$ 564,331	$ 564,391	$ 563,687	[1]	$ 37,252	[1]	$ 14,344	$ 29,011	$ 29,011	$ 17,742	$ 17,971	[1]	$ 87,882	[1]	$ 2,050	[1]	$ 113,893	$ 6,713	$ 92,628	$ 63,422	[1]	$ 160,188	$ 160,188	$ 88,157	[1]	$ 73,106	[1]	$ 16,173	[1]	$ 24,498	[1]	$ 19,230	[1]	$ 36,421	$ 36,432	$ 18,577	[1]	$ 15,852	[1]	$ 10,519	[1]	$ 7,346	[1]	$ 3,265	[1]	$ 6,138	[1]	$ 4,550	[1]	$ 36,372	$ 36,374	$ 26,170	$ 12,344	$ 12,391	$ 11,815	$ 6,690	$ 6,594	[1]	$ 22,679	[1]	$ 285	[1]	$ 15,732	[1]	$ 22,409	[1]	$ 4,639	$ 11,983	$ 7,945	[1]	$ 196	[1]	$ 158	$ 0	$ 3,020	$ 100	$ 0	[1]	$ 595	[1]	$ 0	[1]	$ 652	$ 119	$ 3,112	$ 0	[1]	$ 253	$ 1,004	$ 452	[1]	$ 420	[1]	$ 0	[1]	$ 0	[1]	$ 0	[1]	$ 0	$ 3,520	$ 0	[1]	$ 0	[1]	$ 0	[1]	$ 0	[1]	$ 3,170	[1]	$ 0	[1]	$ 109	[1]	$ 99	$ 152	$ 0	$ 101	$ 101	$ 45	$ 0	$ 0	[1]	$ 42	[1]	$ 0	[1]	$ 0	[1]	$ 2,961	[1]	$ 4,735	$ 4,735	$ 4,242	[1]	$ 137	[1]	$ 0	$ 120	$ 120	$ 182	$ 14	[1]	$ 1,332	[1]	$ 0	[1]	$ 2,413	$ 138	$ 0	$ 790	[1]	$ 1,079	$ 1,079	$ 215	[1]	$ 267	[1]	$ 0	[1]	$ 616	[1]	$ 0	[1]	$ 324	$ 324	$ 0	[1]	$ 0	[1]	$ 0	[1]	$ 0	[1]	$ 0	[1]	$ 387	[1]	$ 247	[1]	$ 318	$ 318	$ 0	$ 56	$ 56	$ 105	$ 0	$ 1	[1]	$ 105	[1]	$ 1	[1]	$ 0	[1]	$ 130	[1]

[1] Segments and classes at December 31, 2011 are reported using the segmentation method in effect for 2011. The Company began reporting under revised segments beginning in 2012.