Allowance for Loan and Lease Losses (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Allowance for loan losses [Roll Forward]
Beginning balance	$ 33,393	$ 33,172	$ 33,245	$ 33,171	$ 33,171
Provision charged to expense	3,661	2,425	5,220	3,585	9,450
Losses charged off	4,115	3,207	6,303	5,333	12,590
Recoveries	662	744	1,439	1,711	3,214
Ending balance	33,601	33,134	33,601	33,134	33,245
Allowance for Loan Losses Ending balance: [Abstract]
Individually evaluated for impairment	3,839	3,329	3,839	3,329	3,248
Collectively evaluated for impairment	29,762	29,805	29,762	29,805	29,997
Loans Ending balance: [Abstract]
Individually evaluated for impairment	63,418	64,448	63,418	64,448	62,498
Collectively evaluated for impairment	2,521,383	2,482,988	2,521,383	2,482,988	2,488,075
Commercial Construction [Member]
Allowance for loan losses [Roll Forward]
Beginning balance	3,827	4,066	4,033	4,023	4,023
Provision charged to expense	1,119	209	907	251	1,009
Losses charged off	1,112	457	1,112	475	1,034
Recoveries	1	113	7	132	35
Ending balance	3,835	3,931	3,835	3,931	4,033
Allowance for Loan Losses Ending balance: [Abstract]
Individually evaluated for impairment	1,890	1,823	1,890	1,823	1,820
Collectively evaluated for impairment	1,945	2,108	1,945	2,108	2,213
Loans Ending balance: [Abstract]
Individually evaluated for impairment	10,576	12,115	10,576	12,115	9,395
Collectively evaluated for impairment	93,224	103,852	93,224	103,852	110,052
Commercial Secured by Real Estate [Member]
Allowance for loan losses [Roll Forward]
Beginning balance	13,682	12,977	13,541	11,753	11,753
Provision charged to expense	1,132	1,170	1,616	2,450	3,520
Losses charged off	653	891	1,018	987	2,035
Recoveries	1	6	23	46	303
Ending balance	14,162	13,262	14,162	13,262	13,541
Allowance for Loan Losses Ending balance: [Abstract]
Individually evaluated for impairment	1,866	1,084	1,866	1,084	1,090
Collectively evaluated for impairment	12,296	12,178	12,296	12,178	12,451
Loans Ending balance: [Abstract]
Individually evaluated for impairment	35,426	38,892	35,426	38,892	38,113
Collectively evaluated for impairment	823,596	775,733	823,596	775,733	769,100
Commercial Other [Member]
Allowance for loan losses [Roll Forward]
Beginning balance	5,151	5,965	5,469	5,608	5,608
Provision charged to expense	541	207	386	925	2,330
Losses charged off	972	783	1,304	1,395	3,233
Recoveries	73	98	242	349	764
Ending balance	4,793	5,487	4,793	5,487	5,469
Allowance for Loan Losses Ending balance: [Abstract]
Individually evaluated for impairment	83	422	83	422	338
Collectively evaluated for impairment	4,710	5,065	4,710	5,065	5,131
Loans Ending balance: [Abstract]
Individually evaluated for impairment	16,389	13,164	16,389	13,164	14,295
Collectively evaluated for impairment	360,517	368,473	360,517	368,473	362,053
Equipment Lease Financing [Member]
Allowance for loan losses [Roll Forward]
Beginning balance	128	105	126	112	112
Provision charged to expense	(11)	37	(9)	30	14
Losses charged off	0	0	0	0	0
Recoveries	0	0	0	0	0
Ending balance	117	142	117	142	126
Allowance for Loan Losses Ending balance: [Abstract]
Individually evaluated for impairment	0	0	0	0	0
Collectively evaluated for impairment	117	142	117	142	126
Loans Ending balance: [Abstract]
Individually evaluated for impairment	0	0	0	0	0
Collectively evaluated for impairment	9,383	10,714	9,383	10,714	9,246
Real Estate Construction [Member]
Allowance for loan losses [Roll Forward]
Beginning balance	372	344	376	354	354
Provision charged to expense	34	42	30	197	183
Losses charged off	38	0	38	171	189
Recoveries	0	4	0	10	28
Ending balance	368	390	368	390	376
Allowance for Loan Losses Ending balance: [Abstract]
Individually evaluated for impairment	0	0	0	0	0
Collectively evaluated for impairment	368	390	368	390	376
Loans Ending balance: [Abstract]
Individually evaluated for impairment	0	0	0	0	0
Collectively evaluated for impairment	51,462	56,451	51,462	56,451	55,041
Real Estate Mortgage [Member]
Allowance for loan losses [Roll Forward]
Beginning balance	4,980	4,240	4,767	4,302	4,302
Provision charged to expense	112	414	446	485	1,437
Losses charged off	151	232	282	422	1,123
Recoveries	9	50	19	107	151
Ending balance	4,950	4,472	4,950	4,472	4,767
Allowance for Loan Losses Ending balance: [Abstract]
Individually evaluated for impairment	0	0	0	0	0
Collectively evaluated for impairment	4,950	4,472	4,950	4,472	4,767
Loans Ending balance: [Abstract]
Individually evaluated for impairment	1,027	277	1,027	277	695
Collectively evaluated for impairment	691,907	647,557	691,907	647,557	696,233
Home Equity [Member]
Allowance for loan losses [Roll Forward]
Beginning balance	571	546	563	562	562
Provision charged to expense	127	64	177	93	238
Losses charged off	126	36	173	82	248
Recoveries	4	0	9	1	11
Ending balance	576	574	576	574	563
Allowance for Loan Losses Ending balance: [Abstract]
Individually evaluated for impairment	0	0	0	0	0
Collectively evaluated for impairment	576	574	576	574	563
Loans Ending balance: [Abstract]
Individually evaluated for impairment	0	0	0	0	0
Collectively evaluated for impairment	80,631	83,101	80,631	83,101	82,292
Consumer Direct [Member]
Allowance for loan losses [Roll Forward]
Beginning balance	1,098	846	1,102	917	917
Provision charged to expense	174	69	339	(48)	892
Losses charged off	277	203	591	349	1,245
Recoveries	139	145	284	337	538
Ending balance	1,134	857	1,134	857	1,102
Allowance for Loan Losses Ending balance: [Abstract]
Individually evaluated for impairment	0	0	0	0	0
Collectively evaluated for impairment	1,134	857	1,134	857	1,102
Loans Ending balance: [Abstract]
Individually evaluated for impairment	0	0	0	0	0
Collectively evaluated for impairment	123,565	124,946	123,565	124,946	122,581
Consumer Indirect [Member]
Allowance for loan losses [Roll Forward]
Beginning balance	3,584	4,083	3,268	5,540	5,540
Provision charged to expense	433	213	1,328	(798)	(173)
Losses charged off	786	605	1,785	1,452	3,483
Recoveries	435	328	855	729	1,384
Ending balance	3,666	4,019	3,666	4,019	3,268
Allowance for Loan Losses Ending balance: [Abstract]
Individually evaluated for impairment	0	0	0	0	0
Collectively evaluated for impairment	3,666	4,019	3,666	4,019	3,268
Loans Ending balance: [Abstract]
Individually evaluated for impairment	0	0	0	0	0
Collectively evaluated for impairment	$ 287,098	$ 312,161	$ 287,098	$ 312,161	$ 281,477