Allowance for Loan Losses (Details 1) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012
Presentation of credit quality indicators
Total loans	$ 1,532,362	$ 1,564,823	$ 1,511,085
Originated loans [Member]
Presentation of credit quality indicators
Total loans	1,372,671	1,397,335
PNCI loans [Member]
Presentation of credit quality indicators
Total loans	94,788	97,920
PCI loans [Member]
Presentation of credit quality indicators
Total loans	64,903	69,568
Pass [Member] | Originated loans [Member]
Presentation of credit quality indicators
Total loans	1,245,461	1,256,795
Pass [Member] | PNCI loans [Member]
Presentation of credit quality indicators
Total loans	85,897	89,230
Special mention [Member] | Originated loans [Member]
Presentation of credit quality indicators
Total loans	34,662	37,170
Special mention [Member] | PNCI loans [Member]
Presentation of credit quality indicators
Total loans	4,073	5,567
Substandard [Member] | Originated loans [Member]
Presentation of credit quality indicators
Total loans	92,548	103,370
Substandard [Member] | PNCI loans [Member]
Presentation of credit quality indicators
Total loans	4,818	3,114
Loss [Member] | PNCI loans [Member]
Presentation of credit quality indicators
Total loans		9
RE Mortgage [Member] | Residential [Member]
Presentation of credit quality indicators
Total loans	135,960	131,684	130,500
RE Mortgage [Member] | Residential [Member] | Originated loans [Member]
Presentation of credit quality indicators
Total loans	125,875	121,255
RE Mortgage [Member] | Residential [Member] | PNCI loans [Member]
Presentation of credit quality indicators
Total loans	5,075	5,413
RE Mortgage [Member] | Residential [Member] | PCI loans [Member]
Presentation of credit quality indicators
Total loans	5,010	5,016
RE Mortgage [Member] | Residential [Member] | Pass [Member] | Originated loans [Member]
Presentation of credit quality indicators
Total loans	116,293	108,946
RE Mortgage [Member] | Residential [Member] | Pass [Member] | PNCI loans [Member]
Presentation of credit quality indicators
Total loans	4,532	4,968
RE Mortgage [Member] | Residential [Member] | Special mention [Member] | Originated loans [Member]
Presentation of credit quality indicators
Total loans	1,920	3,122
RE Mortgage [Member] | Residential [Member] | Substandard [Member] | Originated loans [Member]
Presentation of credit quality indicators
Total loans	7,662	9,187
RE Mortgage [Member] | Residential [Member] | Substandard [Member] | PNCI loans [Member]
Presentation of credit quality indicators
Total loans	543	436
RE Mortgage [Member] | Residential [Member] | Loss [Member] | PNCI loans [Member]
Presentation of credit quality indicators
Total loans		9
RE Mortgage [Member] | Commercial [Member]
Presentation of credit quality indicators
Total loans	874,289	878,446	816,859
RE Mortgage [Member] | Commercial [Member] | Originated loans [Member]
Presentation of credit quality indicators
Total loans	772,296	775,124
RE Mortgage [Member] | Commercial [Member] | PNCI loans [Member]
Presentation of credit quality indicators
Total loans	69,982	72,090
RE Mortgage [Member] | Commercial [Member] | PCI loans [Member]
Presentation of credit quality indicators
Total loans	32,011	31,232
RE Mortgage [Member] | Commercial [Member] | Pass [Member] | Originated loans [Member]
Presentation of credit quality indicators
Total loans	686,714	686,593
RE Mortgage [Member] | Commercial [Member] | Pass [Member] | PNCI loans [Member]
Presentation of credit quality indicators
Total loans	62,804	64,917
RE Mortgage [Member] | Commercial [Member] | Special mention [Member] | Originated loans [Member]
Presentation of credit quality indicators
Total loans	21,690	21,184
RE Mortgage [Member] | Commercial [Member] | Special mention [Member] | PNCI loans [Member]
Presentation of credit quality indicators
Total loans	3,711	5,249
RE Mortgage [Member] | Commercial [Member] | Substandard [Member] | Originated loans [Member]
Presentation of credit quality indicators
Total loans	63,892	67,347
RE Mortgage [Member] | Commercial [Member] | Substandard [Member] | PNCI loans [Member]
Presentation of credit quality indicators
Total loans	3,467	1,924
Home Equity Lines [Member]
Presentation of credit quality indicators
Total loans	333,044	342,025	350,062
Home Equity Lines [Member] | Originated loans [Member]
Presentation of credit quality indicators
Total loans	303,638	311,671
Home Equity Lines [Member] | PNCI loans [Member]
Presentation of credit quality indicators
Total loans	16,341	16,788
Home Equity Lines [Member] | PCI loans [Member]
Presentation of credit quality indicators
Total loans	13,065	13,566
Home Equity Lines [Member] | Pass [Member] | Originated loans [Member]
Presentation of credit quality indicators
Total loans	288,765	291,701
Home Equity Lines [Member] | Pass [Member] | PNCI loans [Member]
Presentation of credit quality indicators
Total loans	15,292	15,915
Home Equity Lines [Member] | Special mention [Member] | Originated loans [Member]
Presentation of credit quality indicators
Total loans	4,450	6,955
Home Equity Lines [Member] | Special mention [Member] | PNCI loans [Member]
Presentation of credit quality indicators
Total loans	282	193
Home Equity Lines [Member] | Substandard [Member] | Originated loans [Member]
Presentation of credit quality indicators
Total loans	10,423	13,015
Home Equity Lines [Member] | Substandard [Member] | PNCI loans [Member]
Presentation of credit quality indicators
Total loans	767	680
Home equity loans [Member]
Presentation of credit quality indicators
Total loans	13,083	13,557	14,559
Home equity loans [Member] | Originated loans [Member]
Presentation of credit quality indicators
Total loans	12,533	13,011
Home equity loans [Member] | PNCI loans [Member]
Presentation of credit quality indicators
Total loans	347	342
Home equity loans [Member] | PCI loans [Member]
Presentation of credit quality indicators
Total loans	203	204
Home equity loans [Member] | Pass [Member] | Originated loans [Member]
Presentation of credit quality indicators
Total loans	11,508	11,892
Home equity loans [Member] | Pass [Member] | PNCI loans [Member]
Presentation of credit quality indicators
Total loans	347	342
Home equity loans [Member] | Special mention [Member] | Originated loans [Member]
Presentation of credit quality indicators
Total loans	295	555
Home equity loans [Member] | Substandard [Member] | Originated loans [Member]
Presentation of credit quality indicators
Total loans	730	564
Auto indirect [Member]
Presentation of credit quality indicators
Total loans	2,821	3,816	8,397
Auto indirect [Member] | Originated loans [Member]
Presentation of credit quality indicators
Total loans	2,821	3,816
Auto indirect [Member] | PNCI loans [Member]
Presentation of credit quality indicators
Total loans
Auto indirect [Member] | PCI loans [Member]
Presentation of credit quality indicators
Total loans
Auto indirect [Member] | Pass [Member] | Originated loans [Member]
Presentation of credit quality indicators
Total loans	2,185	2,949
Auto indirect [Member] | Pass [Member] | PNCI loans [Member]
Presentation of credit quality indicators
Total loans
Auto indirect [Member] | Special mention [Member] | Originated loans [Member]
Presentation of credit quality indicators
Total loans	367	531
Auto indirect [Member] | Special mention [Member] | PNCI loans [Member]
Presentation of credit quality indicators
Total loans
Auto indirect [Member] | Substandard [Member] | Originated loans [Member]
Presentation of credit quality indicators
Total loans	269	336
Auto indirect [Member] | Substandard [Member] | PNCI loans [Member]
Presentation of credit quality indicators
Total loans
Auto indirect [Member] | Loss [Member] | PNCI loans [Member]
Presentation of credit quality indicators
Total loans
Other Consumer [Member]
Presentation of credit quality indicators
Total loans	27,115	26,713	23,671
Other Consumer [Member] | Originated loans [Member]
Presentation of credit quality indicators
Total loans	24,826	24,263
Other Consumer [Member] | PNCI loans [Member]
Presentation of credit quality indicators
Total loans	2,264	2,418
Other Consumer [Member] | PCI loans [Member]
Presentation of credit quality indicators
Total loans	25	32
Other Consumer [Member] | Pass [Member] | Originated loans [Member]
Presentation of credit quality indicators
Total loans	24,007	23,154
Other Consumer [Member] | Pass [Member] | PNCI loans [Member]
Presentation of credit quality indicators
Total loans	2,162	2,240
Other Consumer [Member] | Special mention [Member] | Originated loans [Member]
Presentation of credit quality indicators
Total loans	693	958
Other Consumer [Member] | Special mention [Member] | PNCI loans [Member]
Presentation of credit quality indicators
Total loans	61	104
Other Consumer [Member] | Substandard [Member] | Originated loans [Member]
Presentation of credit quality indicators
Total loans	126	151
Other Consumer [Member] | Substandard [Member] | PNCI loans [Member]
Presentation of credit quality indicators
Total loans	41	74
C&I [Member]
Presentation of credit quality indicators
Total loans	115,483	135,528	128,343
C&I [Member] | Originated loans [Member]
Presentation of credit quality indicators
Total loans	106,275	125,122
C&I [Member] | PNCI loans [Member]
Presentation of credit quality indicators
Total loans	779	869
C&I [Member] | PCI loans [Member]
Presentation of credit quality indicators
Total loans	8,429	9,537
C&I [Member] | Pass [Member] | Originated loans [Member]
Presentation of credit quality indicators
Total loans	96,302	113,595
C&I [Member] | Pass [Member] | PNCI loans [Member]
Presentation of credit quality indicators
Total loans	760	848
C&I [Member] | Special mention [Member] | Originated loans [Member]
Presentation of credit quality indicators
Total loans	4,461	3,224
C&I [Member] | Special mention [Member] | PNCI loans [Member]
Presentation of credit quality indicators
Total loans	19	21
C&I [Member] | Substandard [Member] | Originated loans [Member]
Presentation of credit quality indicators
Total loans	5,512	8,303
Construction [Member] | Residential [Member]
Presentation of credit quality indicators
Total loans	19,521	18,459	22,364
Construction [Member] | Residential [Member] | Originated loans [Member]
Presentation of credit quality indicators
Total loans	14,498	11,877
Construction [Member] | Residential [Member] | PNCI loans [Member]
Presentation of credit quality indicators
Total loans
Construction [Member] | Residential [Member] | PCI loans [Member]
Presentation of credit quality indicators
Total loans	5,023	6,582
Construction [Member] | Residential [Member] | Pass [Member] | Originated loans [Member]
Presentation of credit quality indicators
Total loans	10,487	7,744
Construction [Member] | Residential [Member] | Pass [Member] | PNCI loans [Member]
Presentation of credit quality indicators
Total loans
Construction [Member] | Residential [Member] | Special mention [Member] | Originated loans [Member]
Presentation of credit quality indicators
Total loans	385	285
Construction [Member] | Residential [Member] | Special mention [Member] | PNCI loans [Member]
Presentation of credit quality indicators
Total loans
Construction [Member] | Residential [Member] | Substandard [Member] | Originated loans [Member]
Presentation of credit quality indicators
Total loans	3,626	3,848
Construction [Member] | Residential [Member] | Substandard [Member] | PNCI loans [Member]
Presentation of credit quality indicators
Total loans
Construction [Member] | Residential [Member] | Loss [Member] | PNCI loans [Member]
Presentation of credit quality indicators
Total loans
Construction [Member] | Commercial [Member]
Presentation of credit quality indicators
Total loans	11,046	14,595	16,330
Construction [Member] | Commercial [Member] | Originated loans [Member]
Presentation of credit quality indicators
Total loans	9,909	11,196
Construction [Member] | Commercial [Member] | PNCI loans [Member]
Presentation of credit quality indicators
Total loans
Construction [Member] | Commercial [Member] | PCI loans [Member]
Presentation of credit quality indicators
Total loans	1,137	3,399
Construction [Member] | Commercial [Member] | Pass [Member] | Originated loans [Member]
Presentation of credit quality indicators
Total loans	9,200	10,221
Construction [Member] | Commercial [Member] | Pass [Member] | PNCI loans [Member]
Presentation of credit quality indicators
Total loans
Construction [Member] | Commercial [Member] | Special mention [Member] | Originated loans [Member]
Presentation of credit quality indicators
Total loans	401	356
Construction [Member] | Commercial [Member] | Special mention [Member] | PNCI loans [Member]
Presentation of credit quality indicators
Total loans
Construction [Member] | Commercial [Member] | Substandard [Member] | Originated loans [Member]
Presentation of credit quality indicators
Total loans	308	619
Construction [Member] | Commercial [Member] | Substandard [Member] | PNCI loans [Member]
Presentation of credit quality indicators
Total loans
Construction [Member] | Commercial [Member] | Loss [Member] | PNCI loans [Member]
Presentation of credit quality indicators
Total loans