Loans (Details 8) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Total Commercial Real Estate	$ 1,517,512	$ 1,492,357
Pass [Member]
Total Commercial Real Estate	1,127,841	1,048,452
Special Mention [Member]
Total Commercial Real Estate	29,729	45,000
Substandard [Member]
Total Commercial Real Estate	88,043	117,947
Doubtful [Member]
Total Commercial Real Estate	0	10
Not Graded [Member]
Total Commercial Real Estate	271,899	280,948
Residential Owner Occupied [Member]
Total Commercial Real Estate	134,497	134,804
Residential Owner Occupied [Member] | Pass [Member]
Total Commercial Real Estate	4,096	5,496
Residential Owner Occupied [Member] | Special Mention [Member]
Total Commercial Real Estate	43	205
Residential Owner Occupied [Member] | Substandard [Member]
Total Commercial Real Estate	4,495	4,383
Residential Owner Occupied [Member] | Doubtful [Member]
Total Commercial Real Estate	0	0
Residential Owner Occupied [Member] | Not Graded [Member]
Total Commercial Real Estate	125,863	124,720
Residential Non Owner Occupied [Member]
Total Commercial Real Estate	76,131	69,257
Residential Non Owner Occupied [Member] | Pass [Member]
Total Commercial Real Estate	56,705	48,653
Residential Non Owner Occupied [Member] | Special Mention [Member]
Total Commercial Real Estate	2,304	2,965
Residential Non Owner Occupied [Member] | Substandard [Member]
Total Commercial Real Estate	10,675	8,408
Residential Non Owner Occupied [Member] | Doubtful [Member]
Total Commercial Real Estate	0	0
Residential Non Owner Occupied [Member] | Not Graded [Member]
Total Commercial Real Estate	6,447	9,231
Residential Real Estate [Member]
Total Commercial Real Estate	210,628	204,061
Residential Real Estate [Member] | Pass [Member]
Total Commercial Real Estate	60,801	54,149
Residential Real Estate [Member] | Special Mention [Member]
Total Commercial Real Estate	2,347	3,170
Residential Real Estate [Member] | Substandard [Member]
Total Commercial Real Estate	15,170	12,791
Residential Real Estate [Member] | Doubtful [Member]
Total Commercial Real Estate	0	0
Residential Real Estate [Member] | Not Graded [Member]
Total Commercial Real Estate	132,145	133,951
Construction Loans [Member]
Total Commercial Real Estate	16,582	18,288
Construction Loans [Member] | Pass [Member]
Total Commercial Real Estate	9,484	13,417
Construction Loans [Member] | Special Mention [Member]
Total Commercial Real Estate	0	0
Construction Loans [Member] | Substandard [Member]
Total Commercial Real Estate	0	127
Construction Loans [Member] | Doubtful [Member]
Total Commercial Real Estate	0	0
Construction Loans [Member] | Not Graded [Member]
Total Commercial Real Estate	7,098	4,744
Multi Family [Member]
Total Commercial Real Estate	120,099	126,515
Multi Family [Member] | Pass [Member]
Total Commercial Real Estate	115,662	117,699
Multi Family [Member] | Special Mention [Member]
Total Commercial Real Estate	927	3,519
Multi Family [Member] | Substandard [Member]
Total Commercial Real Estate	2,469	4,186
Multi Family [Member] | Doubtful [Member]
Total Commercial Real Estate	0	0
Multi Family [Member] | Not Graded [Member]
Total Commercial Real Estate	1,041	1,111
Commercial Real Estate Owner Occupied [Member]
Total Commercial Real Estate	323,409	295,326
Commercial Real Estate Owner Occupied [Member] | Pass [Member]
Total Commercial Real Estate	292,529	256,861
Commercial Real Estate Owner Occupied [Member] | Special Mention [Member]
Total Commercial Real Estate	9,875	12,058
Commercial Real Estate Owner Occupied [Member] | Substandard [Member]
Total Commercial Real Estate	18,489	26,323
Commercial Real Estate Owner Occupied [Member] | Doubtful [Member]
Total Commercial Real Estate	0	0
Commercial Real Estate Owner Occupied [Member] | Not Graded [Member]
Total Commercial Real Estate	2,516	84
Commercial Real Estate Non Owner Occupied [Member]
Total Commercial Real Estate	240,961	249,311
Commercial Real Estate Non Owner Occupied [Member] | Pass [Member]
Total Commercial Real Estate	208,354	210,113
Commercial Real Estate Non Owner Occupied [Member] | Special Mention [Member]
Total Commercial Real Estate	3,654	5,390
Commercial Real Estate Non Owner Occupied [Member] | Substandard [Member]
Total Commercial Real Estate	28,839	33,656
Commercial Real Estate Non Owner Occupied [Member] | Doubtful [Member]
Total Commercial Real Estate	0	0
Commercial Real Estate Non Owner Occupied [Member] | Not Graded [Member]
Total Commercial Real Estate	114	152
Agriculture Land [Member]
Total Commercial Real Estate	72,354	70,947
Agriculture Land [Member] | Pass [Member]
Total Commercial Real Estate	69,543	66,484
Agriculture Land [Member] | Special Mention [Member]
Total Commercial Real Estate	1,260	1,723
Agriculture Land [Member] | Substandard [Member]
Total Commercial Real Estate	1,551	2,740
Agriculture Land [Member] | Doubtful [Member]
Total Commercial Real Estate	0	0
Agriculture Land [Member] | Not Graded [Member]
Total Commercial Real Estate	0	0
Commercial Real Estate Other Receivable [Member]
Total Commercial Real Estate	37,830	36,105
Commercial Real Estate Other Receivable [Member] | Pass [Member]
Total Commercial Real Estate	29,458	21,616
Commercial Real Estate Other Receivable [Member] | Special Mention [Member]
Total Commercial Real Estate	497	2,687
Commercial Real Estate Other Receivable [Member] | Substandard [Member]
Total Commercial Real Estate	6,949	10,661
Commercial Real Estate Other Receivable [Member] | Doubtful [Member]
Total Commercial Real Estate	0	0
Commercial Real Estate Other Receivable [Member] | Not Graded [Member]
Total Commercial Real Estate	926	1,141
Commercial Real Estate [Member]
Total Commercial Real Estate	674,554	651,689
Commercial Real Estate [Member] | Pass [Member]
Total Commercial Real Estate	599,884	555,074
Commercial Real Estate [Member] | Special Mention [Member]
Total Commercial Real Estate	15,286	21,858
Commercial Real Estate [Member] | Substandard [Member]
Total Commercial Real Estate	55,828	73,380
Commercial Real Estate [Member] | Doubtful [Member]
Total Commercial Real Estate	0	0
Commercial Real Estate [Member] | Not Graded [Member]
Total Commercial Real Estate	3,556	1,377
Commercial Working Capital [Member]
Total Commercial Real Estate	159,571	137,775
Commercial Working Capital [Member] | Pass [Member]
Total Commercial Real Estate	150,303	125,149
Commercial Working Capital [Member] | Special Mention [Member]
Total Commercial Real Estate	4,891	6,125
Commercial Working Capital [Member] | Substandard [Member]
Total Commercial Real Estate	4,377	6,501
Commercial Working Capital [Member] | Doubtful [Member]
Total Commercial Real Estate	0	0
Commercial Working Capital [Member] | Not Graded [Member]
Total Commercial Real Estate	0	0
Commercial Loans Other [Member]
Total Commercial Real Estate	207,223	212,457
Commercial Loans Other [Member] | Pass [Member]
Total Commercial Real Estate	191,707	182,964
Commercial Loans Other [Member] | Special Mention [Member]
Total Commercial Real Estate	6,278	10,328
Commercial Loans Other [Member] | Substandard [Member]
Total Commercial Real Estate	9,238	19,165
Commercial Loans Other [Member] | Doubtful [Member]
Total Commercial Real Estate	0	0
Commercial Loans Other [Member] | Not Graded [Member]
Total Commercial Real Estate	0	0
Commercial Loan [Member]
Total Commercial Real Estate	366,794	350,232
Commercial Loan [Member] | Pass [Member]
Total Commercial Real Estate	342,010	308,113
Commercial Loan [Member] | Special Mention [Member]
Total Commercial Real Estate	11,169	16,453
Commercial Loan [Member] | Substandard [Member]
Total Commercial Real Estate	13,615	25,666
Commercial Loan [Member] | Doubtful [Member]
Total Commercial Real Estate	0	0
Commercial Loan [Member] | Not Graded [Member]
Total Commercial Real Estate	0	0
Consumer Loan [Member]
Total Commercial Real Estate	16,790	18,910
Consumer Loan [Member] | Pass [Member]
Total Commercial Real Estate	0	0
Consumer Loan [Member] | Special Mention [Member]
Total Commercial Real Estate	0	0
Consumer Loan [Member] | Substandard [Member]
Total Commercial Real Estate	63	63
Consumer Loan [Member] | Doubtful [Member]
Total Commercial Real Estate	0	10
Consumer Loan [Member] | Not Graded [Member]
Total Commercial Real Estate	16,727	18,837
Home Equity [Member]
Total Commercial Real Estate	112,065	122,663
Home Equity [Member] | Pass [Member]
Total Commercial Real Estate	0	0
Home Equity [Member] | Special Mention [Member]
Total Commercial Real Estate	0	0
Home Equity [Member] | Substandard [Member]
Total Commercial Real Estate	898	1,734
Home Equity [Member] | Doubtful [Member]
Total Commercial Real Estate	0	0
Home Equity [Member] | Not Graded [Member]
Total Commercial Real Estate	$ 111,167	$ 120,928