Loans (Details 3) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired Financing Receivable, Average Recorded Investment	$ 49,191	$ 59,274	$ 48,897	$ 64,262
Impaired Financing Receivable, Interest Income Recognized	277	386	637	1,480
Impaired Financing Receivable, Cash Basis Income Recognized	326	382	635	1,401
Residential Owner Occupied [Member]
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired Financing Receivable, Average Recorded Investment	1,912	2,224	1,921	2,763
Impaired Financing Receivable, Interest Income Recognized	15	14	45	53
Impaired Financing Receivable, Cash Basis Income Recognized	14	14	42	51
Residential Non Owner Occupied [Member]
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired Financing Receivable, Average Recorded Investment	6,141	2,249	5,397	2,656
Impaired Financing Receivable, Interest Income Recognized	54	28	126	64
Impaired Financing Receivable, Cash Basis Income Recognized	58	28	129	68
Residential Real Estate [Member]
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired Financing Receivable, Average Recorded Investment	8,053	4,473	7,318	5,419
Impaired Financing Receivable, Interest Income Recognized	69	42	171	117
Impaired Financing Receivable, Cash Basis Income Recognized	72	42	171	119
Construction Loans [Member]
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired Financing Receivable, Average Recorded Investment	0	0	0	31
Impaired Financing Receivable, Interest Income Recognized	0	0	0	0
Impaired Financing Receivable, Cash Basis Income Recognized	0	0	0	0
Multi Family [Member]
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired Financing Receivable, Average Recorded Investment	811	1,836	627	2,263
Impaired Financing Receivable, Interest Income Recognized	10	16	11	73
Impaired Financing Receivable, Cash Basis Income Recognized	10	16	11	67
Commercial Real Estate Owner Occupied [Member]
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired Financing Receivable, Average Recorded Investment	12,414	10,210	11,019	11,340
Impaired Financing Receivable, Interest Income Recognized	53	52	92	267
Impaired Financing Receivable, Cash Basis Income Recognized	44	55	88	249
Commercial Real Estate Non Owner Occupied [Member]
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired Financing Receivable, Average Recorded Investment	14,881	19,830	15,231	19,950
Impaired Financing Receivable, Interest Income Recognized	104	184	284	674
Impaired Financing Receivable, Cash Basis Income Recognized	161	183	287	624
Agriculture Land [Member]
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired Financing Receivable, Average Recorded Investment	773	1,773	1,107	2,072
Impaired Financing Receivable, Interest Income Recognized	6	17	20	39
Impaired Financing Receivable, Cash Basis Income Recognized	1	16	15	39
Commercial Real Estate Other Receivable [Member]
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired Financing Receivable, Average Recorded Investment	5,987	8,483	7,015	7,869
Impaired Financing Receivable, Interest Income Recognized	1	10	4	51
Impaired Financing Receivable, Cash Basis Income Recognized	1	7	4	42
Commercial Real Estate [Member]
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired Financing Receivable, Average Recorded Investment	34,055	40,296	34,372	41,231
Impaired Financing Receivable, Interest Income Recognized	164	263	400	1,031
Impaired Financing Receivable, Cash Basis Income Recognized	207	261	394	954
Commercial Working Capital [Member]
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired Financing Receivable, Average Recorded Investment	2,048	3,346	2,005	4,260
Impaired Financing Receivable, Interest Income Recognized	9	21	13	68
Impaired Financing Receivable, Cash Basis Income Recognized	11	21	15	71
Commercial Loans Other [Member]
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired Financing Receivable, Average Recorded Investment	4,188	9,012	4,538	10,745
Impaired Financing Receivable, Interest Income Recognized	25	40	40	180
Impaired Financing Receivable, Cash Basis Income Recognized	26	39	42	179
Commercial Loan [Member]
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired Financing Receivable, Average Recorded Investment	6,236	12,358	6,543	15,005
Impaired Financing Receivable, Interest Income Recognized	34	61	53	248
Impaired Financing Receivable, Cash Basis Income Recognized	37	60	57	250
Consumer Loan [Member]
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired Financing Receivable, Average Recorded Investment	0	0	0	0
Impaired Financing Receivable, Interest Income Recognized	0	0	0	0
Impaired Financing Receivable, Cash Basis Income Recognized	0	0	0	0
Home Equity [Member]
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired Financing Receivable, Average Recorded Investment	36	311	37	313
Impaired Financing Receivable, Interest Income Recognized	0	4	2	11
Impaired Financing Receivable, Cash Basis Income Recognized	$ 0	$ 3	$ 2	$ 11