Loans and Allowance for Loan Losses (Impaired Financing Receivables) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Dec. 31, 2011
Financing Receivable, Impaired [Line Items]
Recorded investment (after charge-offs): with no specific allowance recorded	$ 26,491	$ 21,822
Recorded investment (after charge-offs): With an allowance recorded	7,979	8,546
Recorded investment (after charge-offs): Total	34,470	30,368
Unpaid principal balance: With no specific allowance recorded	27,596	23,018
Unpaid principal balance: With an allowance recorded	8,607	9,255
Unpaid principal balance: Total	36,203	32,273
Related allowance	2,350	2,065
Average recorded investment	32,113
Interest income recognized	625
Commercial: Commercial and industrial [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment (after charge-offs): with no specific allowance recorded	6,413	4,923
Recorded investment (after charge-offs): With an allowance recorded	1,987	3,165
Recorded investment (after charge-offs): Total	8,400	8,088
Unpaid principal balance: With no specific allowance recorded	6,636	5,580
Unpaid principal balance: With an allowance recorded	2,082	3,231
Unpaid principal balance: Total	8,718	8,811
Related allowance	1,390	1,444
Average recorded investment	7,544
Interest income recognized	55
Commercial: Construction [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment (after charge-offs): with no specific allowance recorded	4,644	4,016
Recorded investment (after charge-offs): With an allowance recorded		647
Recorded investment (after charge-offs): Total	4,644	4,663
Unpaid principal balance: With no specific allowance recorded	4,792	4,047
Unpaid principal balance: With an allowance recorded		654
Unpaid principal balance: Total	4,792	4,701
Related allowance		65
Average recorded investment	5,188
Interest income recognized	92
Commercial: Secured by commercial real estate [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment (after charge-offs): with no specific allowance recorded	12,254	10,400
Recorded investment (after charge-offs): With an allowance recorded	3,457	3,179
Recorded investment (after charge-offs): Total	15,711	13,579
Unpaid principal balance: With no specific allowance recorded	12,942	10,841
Unpaid principal balance: With an allowance recorded	3,912	3,779
Unpaid principal balance: Total	16,854	14,620
Related allowance	376	181
Average recorded investment	14,578
Interest income recognized	387
Commercial: Secured by residential real estate [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment (after charge-offs): with no specific allowance recorded	920	1,598
Recorded investment (after charge-offs): With an allowance recorded	1,953	969
Recorded investment (after charge-offs): Total	2,873	2,567
Unpaid principal balance: With no specific allowance recorded	932	1,603
Unpaid principal balance: With an allowance recorded	2,004	985
Unpaid principal balance: Total	2,936	2,588
Related allowance	352	211
Average recorded investment	2,311
Interest income recognized	39
State and political subdivisions [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment (after charge-offs): with no specific allowance recorded	1,881
Recorded investment (after charge-offs): With an allowance recorded	9	4
Recorded investment (after charge-offs): Total	1,890	4
Unpaid principal balance: With no specific allowance recorded	1,881
Unpaid principal balance: With an allowance recorded	12	5
Unpaid principal balance: Total	1,893	5
Related allowance	5	2
Average recorded investment	1,363
Interest income recognized	43
Indirect lease financing [member]
Financing Receivable, Impaired [Line Items]
Recorded investment (after charge-offs): with no specific allowance recorded	33	47
Recorded investment (after charge-offs): With an allowance recorded	69	74
Recorded investment (after charge-offs): Total	102	121
Unpaid principal balance: With no specific allowance recorded	40	71
Unpaid principal balance: With an allowance recorded	72	84
Unpaid principal balance: Total	112	155
Related allowance	23	18
Average recorded investment	84
Retail: 1-4 family residential mortgages [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment (after charge-offs): with no specific allowance recorded	185	352
Recorded investment (after charge-offs): With an allowance recorded	278	288
Recorded investment (after charge-offs): Total	463	640
Unpaid principal balance: With no specific allowance recorded	200	384
Unpaid principal balance: With an allowance recorded	288	293
Unpaid principal balance: Total	488	677
Related allowance	88	81
Average recorded investment	536
Interest income recognized	4
Retail: Home equity loans and lines [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment (after charge-offs): with no specific allowance recorded	161	486
Recorded investment (after charge-offs): With an allowance recorded	226	220
Recorded investment (after charge-offs): Total	387	706
Unpaid principal balance: With no specific allowance recorded	173	492
Unpaid principal balance: With an allowance recorded	237	224
Unpaid principal balance: Total	410	716
Related allowance	116	63
Average recorded investment	509
Interest income recognized	$ 5