Loans, Impaired Financing Receivable (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended		12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Unpaid Contractual Principal Balance [Abstract]
Unpaid Contractual Principal Balance With No Related Allowance Recorded	$ 27,110	$ 52,977	$ 36,332
Unpaid Contractual Principal Balance With An Allowance Recorded	26,583	24,057	28,034
Unpaid Contractual Principal Balance, Total	53,693	77,034	64,366
Impaired Balance [Abstract]
Impaired Balance With No Related Allowance Recorded	21,727	44,699	29,820
Impaired Balance With An Allowance Recorded	24,132	20,893	26,278
Impaired Balance, Total	45,859	65,592	56,098
Related Allowance [Abstract]
Related Allowance With No Related Allowance Recorded	0	0	0
Related Allowance With An Allowance Recorded	3,216	4,214	4,272
Related Allowance, Total	3,216	4,214	4,272
Average Recorded Investment [Abstract]
Average Recorded Investment With No Related Allowance Recorded	14,605	46,676	42,461
Average Recorded Investment With An Allowance Recorded	16,782	20,878	22,229
Average Recorded Investment, Total	31,387	67,554	64,690
Interest Income Recognized [Abstract]
Interest Income Recognized With No Related Allowance Recorded	292	793	627
Interest Income Recognized With An Allowance Recorded	410	264	621
Interest Income Recognized, Total	702	1,057	1,248
Interest Income Collected [Abstract]
Interest Income Collected With No Related Allowance Recorded	316	837	693
Interest Income Collected With An Allowance Recorded	415	262	571
Interest Income Collected, Total	731	1,099	1,264
Commercial [Member]
Unpaid Contractual Principal Balance [Abstract]
Unpaid Contractual Principal Balance With No Related Allowance Recorded	266	85	1,508
Unpaid Contractual Principal Balance With An Allowance Recorded	1,465	1,677	1,493
Unpaid Contractual Principal Balance, Total	1,731	1,762	3,001
Impaired Balance [Abstract]
Impaired Balance With No Related Allowance Recorded	265	34	1,042
Impaired Balance With An Allowance Recorded	1,465	1,677	1,493
Impaired Balance, Total	1,730	1,711	2,535
Related Allowance [Abstract]
Related Allowance With No Related Allowance Recorded	0	0	0
Related Allowance With An Allowance Recorded	108	514	463
Related Allowance, Total	108	514	463
Average Recorded Investment [Abstract]
Average Recorded Investment With No Related Allowance Recorded	98	1,056	1,053
Average Recorded Investment With An Allowance Recorded	1,280	759	943
Average Recorded Investment, Total	1,378	1,815	1,996
Interest Income Recognized [Abstract]
Interest Income Recognized With No Related Allowance Recorded	11	4	27
Interest Income Recognized With An Allowance Recorded	14	69	92
Interest Income Recognized, Total	25	73	119
Interest Income Collected [Abstract]
Interest Income Collected With No Related Allowance Recorded	14	2	28
Interest Income Collected With An Allowance Recorded	19	64	88
Interest Income Collected, Total	33	66	116
Agricultural [Member]
Unpaid Contractual Principal Balance [Abstract]
Unpaid Contractual Principal Balance With No Related Allowance Recorded	0	109	39
Unpaid Contractual Principal Balance With An Allowance Recorded	0	0	0
Unpaid Contractual Principal Balance, Total	0	109	39
Impaired Balance [Abstract]
Impaired Balance With No Related Allowance Recorded	0	109	39
Impaired Balance With An Allowance Recorded	0	0	0
Impaired Balance, Total	0	109	39
Related Allowance [Abstract]
Related Allowance With No Related Allowance Recorded	0	0	0
Related Allowance With An Allowance Recorded	0	0	0
Related Allowance, Total	0	0	0
Average Recorded Investment [Abstract]
Average Recorded Investment With No Related Allowance Recorded	13	64	58
Average Recorded Investment With An Allowance Recorded	0	0	0
Average Recorded Investment, Total	13	64	58
Interest Income Recognized [Abstract]
Interest Income Recognized With No Related Allowance Recorded	0	8	0
Interest Income Recognized With An Allowance Recorded	0	0	0
Interest Income Recognized, Total	0	8	0
Interest Income Collected [Abstract]
Interest Income Collected With No Related Allowance Recorded	0	18	0
Interest Income Collected With An Allowance Recorded	0	0	0
Interest Income Collected, Total	0	18	0
Commercial Construction [Member]
Unpaid Contractual Principal Balance [Abstract]
Unpaid Contractual Principal Balance With No Related Allowance Recorded	8,335	10,527	10,625
Unpaid Contractual Principal Balance With An Allowance Recorded	5,924	12,331	8,267
Unpaid Contractual Principal Balance, Total	14,259	22,858	18,892
Impaired Balance [Abstract]
Impaired Balance With No Related Allowance Recorded	5,010	8,205	6,415
Impaired Balance With An Allowance Recorded	3,473	10,610	7,618
Impaired Balance, Total	8,483	18,815	14,033
Related Allowance [Abstract]
Related Allowance With No Related Allowance Recorded	0	0	0
Related Allowance With An Allowance Recorded	573	1,786	1,733
Related Allowance, Total	573	1,786	1,733
Average Recorded Investment [Abstract]
Average Recorded Investment With No Related Allowance Recorded	2,220	10,121	9,194
Average Recorded Investment With An Allowance Recorded	4,386	11,506	10,534
Average Recorded Investment, Total	6,606	21,627	19,728
Interest Income Recognized [Abstract]
Interest Income Recognized With No Related Allowance Recorded	17	(9)	27
Interest Income Recognized With An Allowance Recorded	0	1	0
Interest Income Recognized, Total	17	(8)	27
Interest Income Collected [Abstract]
Interest Income Collected With No Related Allowance Recorded	23	1	52
Interest Income Collected With An Allowance Recorded	0	4	0
Interest Income Collected, Total	23	5	52
Commercial Real Estate [Member]
Unpaid Contractual Principal Balance [Abstract]
Unpaid Contractual Principal Balance With No Related Allowance Recorded	8,559	35,399	16,566
Unpaid Contractual Principal Balance With An Allowance Recorded	15,061	4,789	12,759
Unpaid Contractual Principal Balance, Total	23,620	40,188	29,325
Impaired Balance [Abstract]
Impaired Balance With No Related Allowance Recorded	8,064	30,152	15,506
Impaired Balance With An Allowance Recorded	15,061	4,059	12,745
Impaired Balance, Total	23,125	34,211	28,251
Related Allowance [Abstract]
Related Allowance With No Related Allowance Recorded	0	0	0
Related Allowance With An Allowance Recorded	1,559	864	1,236
Related Allowance, Total	1,559	864	1,236
Average Recorded Investment [Abstract]
Average Recorded Investment With No Related Allowance Recorded	8,493	30,141	26,482
Average Recorded Investment With An Allowance Recorded	7,785	4,282	6,399
Average Recorded Investment, Total	16,278	34,423	32,881
Interest Income Recognized [Abstract]
Interest Income Recognized With No Related Allowance Recorded	95	670	430
Interest Income Recognized With An Allowance Recorded	287	115	384
Interest Income Recognized, Total	382	785	814
Interest Income Collected [Abstract]
Interest Income Collected With No Related Allowance Recorded	113	667	421
Interest Income Collected With An Allowance Recorded	285	116	366
Interest Income Collected, Total	398	783	787
Residential Real Estate [Member]
Unpaid Contractual Principal Balance [Abstract]
Unpaid Contractual Principal Balance With No Related Allowance Recorded	7,378	4,291	4,450
Unpaid Contractual Principal Balance With An Allowance Recorded	2,804	5,260	5,515
Unpaid Contractual Principal Balance, Total	10,182	9,551	9,965
Impaired Balance [Abstract]
Impaired Balance With No Related Allowance Recorded	5,830	3,694	4,132
Impaired Balance With An Allowance Recorded	2,804	4,547	4,422
Impaired Balance, Total	8,634	8,241	8,554
Related Allowance [Abstract]
Related Allowance With No Related Allowance Recorded	0	0	0
Related Allowance With An Allowance Recorded	774	1,050	840
Related Allowance, Total	774	1,050	840
Average Recorded Investment [Abstract]
Average Recorded Investment With No Related Allowance Recorded	2,022	2,751	3,096
Average Recorded Investment With An Allowance Recorded	3,331	4,244	4,288
Average Recorded Investment, Total	5,353	6,995	7,384
Interest Income Recognized [Abstract]
Interest Income Recognized With No Related Allowance Recorded	157	84	89
Interest Income Recognized With An Allowance Recorded	65	79	145
Interest Income Recognized, Total	222	163	234
Interest Income Collected [Abstract]
Interest Income Collected With No Related Allowance Recorded	152	99	123
Interest Income Collected With An Allowance Recorded	64	78	117
Interest Income Collected, Total	216	177	240
Farmland [Member]
Unpaid Contractual Principal Balance [Abstract]
Unpaid Contractual Principal Balance With No Related Allowance Recorded	2,277	2,340	2,829
Unpaid Contractual Principal Balance With An Allowance Recorded	1,329	0	0
Unpaid Contractual Principal Balance, Total	3,606	2,340	2,829
Impaired Balance [Abstract]
Impaired Balance With No Related Allowance Recorded	2,277	2,297	2,413
Impaired Balance With An Allowance Recorded	1,329	0	0
Impaired Balance, Total	3,606	2,297	2,413
Related Allowance [Abstract]
Related Allowance With No Related Allowance Recorded	0	0	0
Related Allowance With An Allowance Recorded	202	0	0
Related Allowance, Total	202	0	0
Average Recorded Investment [Abstract]
Average Recorded Investment With No Related Allowance Recorded	1,618	2,297	2,326
Average Recorded Investment With An Allowance Recorded	0	87	65
Average Recorded Investment, Total	1,618	2,384	2,391
Interest Income Recognized [Abstract]
Interest Income Recognized With No Related Allowance Recorded	0	31	43
Interest Income Recognized With An Allowance Recorded	44	0	0
Interest Income Recognized, Total	44	31	43
Interest Income Collected [Abstract]
Interest Income Collected With No Related Allowance Recorded	0	44	55
Interest Income Collected With An Allowance Recorded	47	0	0
Interest Income Collected, Total	47	44	55
Consumer [Member]
Unpaid Contractual Principal Balance [Abstract]
Unpaid Contractual Principal Balance With No Related Allowance Recorded	295	226	297
Unpaid Contractual Principal Balance With An Allowance Recorded	0	0	0
Unpaid Contractual Principal Balance, Total	295	226	297
Impaired Balance [Abstract]
Impaired Balance With No Related Allowance Recorded	281	208	255
Impaired Balance With An Allowance Recorded	0	0	0
Impaired Balance, Total	281	208	255
Related Allowance [Abstract]
Related Allowance With No Related Allowance Recorded	0	0	0
Related Allowance With An Allowance Recorded	0	0	0
Related Allowance, Total	0	0	0
Average Recorded Investment [Abstract]
Average Recorded Investment With No Related Allowance Recorded	141	219	228
Average Recorded Investment With An Allowance Recorded	0	0	0
Average Recorded Investment, Total	141	219	228
Interest Income Recognized [Abstract]
Interest Income Recognized With No Related Allowance Recorded	12	5	10
Interest Income Recognized With An Allowance Recorded	0	0	0
Interest Income Recognized, Total	12	5	10
Interest Income Collected [Abstract]
Interest Income Collected With No Related Allowance Recorded	14	6	13
Interest Income Collected With An Allowance Recorded	0	0	0
Interest Income Collected, Total	14	6	13
Other [Member]
Unpaid Contractual Principal Balance [Abstract]
Unpaid Contractual Principal Balance With No Related Allowance Recorded	0	0	18
Unpaid Contractual Principal Balance With An Allowance Recorded	0	0	0
Unpaid Contractual Principal Balance, Total	0	0	18
Impaired Balance [Abstract]
Impaired Balance With No Related Allowance Recorded	0	0	18
Impaired Balance With An Allowance Recorded	0	0	0
Impaired Balance, Total	0	0	18
Related Allowance [Abstract]
Related Allowance With No Related Allowance Recorded	0	0	0
Related Allowance With An Allowance Recorded	0	0	0
Related Allowance, Total	0	0	0
Average Recorded Investment [Abstract]
Average Recorded Investment With No Related Allowance Recorded	0	27	24
Average Recorded Investment With An Allowance Recorded	0	0	0
Average Recorded Investment, Total	0	27	24
Interest Income Recognized [Abstract]
Interest Income Recognized With No Related Allowance Recorded	0	0	1
Interest Income Recognized With An Allowance Recorded	0	0	0
Interest Income Recognized, Total	0	0	1
Interest Income Collected [Abstract]
Interest Income Collected With No Related Allowance Recorded	0	0	1
Interest Income Collected With An Allowance Recorded	0	0	0
Interest Income Collected, Total	0	0	1
Residential Construction [Member]
Unpaid Contractual Principal Balance [Abstract]
Unpaid Contractual Principal Balance With No Related Allowance Recorded	0	0	0
Unpaid Contractual Principal Balance With An Allowance Recorded	0	0	0
Unpaid Contractual Principal Balance, Total	0	0	0
Impaired Balance [Abstract]
Impaired Balance With No Related Allowance Recorded	0	0	0
Impaired Balance With An Allowance Recorded	0	0	0
Impaired Balance, Total	0	0	0
Related Allowance [Abstract]
Related Allowance With No Related Allowance Recorded	0	0	0
Related Allowance With An Allowance Recorded	0	0	0
Related Allowance, Total	0	0	0
Average Recorded Investment [Abstract]
Average Recorded Investment With No Related Allowance Recorded	0	0	0
Average Recorded Investment With An Allowance Recorded	0	0	0
Average Recorded Investment, Total	0	0	0
Interest Income Recognized [Abstract]
Interest Income Recognized With No Related Allowance Recorded	0	0	0
Interest Income Recognized With An Allowance Recorded	0	0	0
Interest Income Recognized, Total	0	0	0
Interest Income Collected [Abstract]
Interest Income Collected With No Related Allowance Recorded	0	0	0
Interest Income Collected With An Allowance Recorded	0	0	0
Interest Income Collected, Total	$ 0	$ 0	$ 0