Loans, Impaired Financing Receivable (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Unpaid Contractual Principal Balance [Abstract]
Unpaid Contractual Principal Balance With No Related Allowance Recorded	$ 37,232	$ 30,255	$ 36,744
Unpaid Contractual Principal Balance With An Allowance Recorded	16,054	23,840	16,526
Unpaid Contractual Principal Balance, Total	53,286	54,095	53,270
Impaired Balance [Abstract]
Impaired Balance With No Related Allowance Recorded	32,134	25,601	31,289
Impaired Balance With An Allowance Recorded	13,237	21,988	13,975
Impaired Balance, Total	45,371	47,589	45,264
Related Allowance [Abstract]
Related Allowance With No Related Allowance Recorded	0	0	0
Related Allowance With An Allowance Recorded	2,900	4,493	2,299
Related Allowance, Total	2,900	4,493	2,299
Average Recorded Investment [Abstract]
Average Recorded Investment With No Related Allowance Recorded	32,134	25,601	24,209
Average Recorded Investment With An Allowance Recorded	13,237	21,988	22,112
Average Recorded Investment, Total	45,371	47,589	46,321
Interest Income Recognized [Abstract]
Interest Income Recognized With No Related Allowance Recorded	184	118	797
Interest Income Recognized With An Allowance Recorded	57	133	243
Interest Income Recognized, Total	241	251	1,040
Interest Income Collected [Abstract]
Interest Income Collected With No Related Allowance Recorded	207	161	802
Interest Income Collected With An Allowance Recorded	61	145	240
Interest Income Collected, Total	268	306	1,042
Commercial [Member]
Unpaid Contractual Principal Balance [Abstract]
Unpaid Contractual Principal Balance With No Related Allowance Recorded	599	264	305
Unpaid Contractual Principal Balance With An Allowance Recorded	1,380	1,465	1,453
Unpaid Contractual Principal Balance, Total	1,979	1,729	1,758
Impaired Balance [Abstract]
Impaired Balance With No Related Allowance Recorded	599	122	305
Impaired Balance With An Allowance Recorded	1,380	1,465	1,453
Impaired Balance, Total	1,979	1,587	1,758
Related Allowance [Abstract]
Related Allowance With No Related Allowance Recorded	0	0	0
Related Allowance With An Allowance Recorded	423	456	434
Related Allowance, Total	423	456	434
Average Recorded Investment [Abstract]
Average Recorded Investment With No Related Allowance Recorded	599	122	216
Average Recorded Investment With An Allowance Recorded	1,380	1,465	1,689
Average Recorded Investment, Total	1,979	1,587	1,905
Interest Income Recognized [Abstract]
Interest Income Recognized With No Related Allowance Recorded	5	3	24
Interest Income Recognized With An Allowance Recorded	0	20	15
Interest Income Recognized, Total	5	23	39
Interest Income Collected [Abstract]
Interest Income Collected With No Related Allowance Recorded	13	4	25
Interest Income Collected With An Allowance Recorded	0	17	21
Interest Income Collected, Total	13	21	46
Agricultural [Member]
Unpaid Contractual Principal Balance [Abstract]
Unpaid Contractual Principal Balance With No Related Allowance Recorded	56	39	0
Unpaid Contractual Principal Balance With An Allowance Recorded	0	0	0
Unpaid Contractual Principal Balance, Total	56	39	0
Impaired Balance [Abstract]
Impaired Balance With No Related Allowance Recorded	51	39	0
Impaired Balance With An Allowance Recorded	0	0	0
Impaired Balance, Total	51	39	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	51	39	10
Average Recorded Investment With An Allowance Recorded	0	0	0
Average Recorded Investment, Total	51	39	10
Interest Income Recognized [Abstract]
Interest Income Recognized With No Related Allowance Recorded	(9)	0	0
Interest Income Recognized With An Allowance Recorded	0	0	0
Interest Income Recognized, Total	(9)	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
Commercial Construction [Member]
Unpaid Contractual Principal Balance [Abstract]
Unpaid Contractual Principal Balance With No Related Allowance Recorded	7,460	9,002	7,856
Unpaid Contractual Principal Balance With An Allowance Recorded	5,922	5,339	5,923
Unpaid Contractual Principal Balance, Total	13,382	14,341	13,779
Impaired Balance [Abstract]
Impaired Balance With No Related Allowance Recorded	4,354	4,962	4,750
Impaired Balance With An Allowance Recorded	3,470	4,690	3,472
Impaired Balance, Total	7,824	9,652	8,222
Related Allowance [Abstract]
Related Allowance With No Related Allowance Recorded	0	0	0
Related Allowance With An Allowance Recorded	1,548	1,493	830
Related Allowance, Total	1,548	1,493	830
Average Recorded Investment [Abstract]
Average Recorded Investment With No Related Allowance Recorded	4,354	4,962	4,106
Average Recorded Investment With An Allowance Recorded	3,470	4,690	5,025
Average Recorded Investment, Total	7,824	9,652	9,131
Interest Income Recognized [Abstract]
Interest Income Recognized With No Related Allowance Recorded	8	4	35
Interest Income Recognized With An Allowance Recorded	0	0	0
Interest Income Recognized, Total	8	4	35
Interest Income Collected [Abstract]
Interest Income Collected With No Related Allowance Recorded	8	5	41
Interest Income Collected With An Allowance Recorded	0	1	0
Interest Income Collected, Total	8	6	41
Commercial Real Estate [Member]
Unpaid Contractual Principal Balance [Abstract]
Unpaid Contractual Principal Balance With No Related Allowance Recorded	21,196	15,405	20,121
Unpaid Contractual Principal Balance With An Allowance Recorded	6,466	10,077	5,874
Unpaid Contractual Principal Balance, Total	27,662	25,482	25,995
Impaired Balance [Abstract]
Impaired Balance With No Related Allowance Recorded	20,686	15,331	19,253
Impaired Balance With An Allowance Recorded	6,109	9,917	5,874
Impaired Balance, Total	26,795	25,248	25,127
Related Allowance [Abstract]
Related Allowance With No Related Allowance Recorded	0	0	0
Related Allowance With An Allowance Recorded	407	1,426	424
Related Allowance, Total	407	1,426	424
Average Recorded Investment [Abstract]
Average Recorded Investment With No Related Allowance Recorded	20,686	15,331	13,199
Average Recorded Investment With An Allowance Recorded	6,109	9,917	11,072
Average Recorded Investment, Total	26,795	25,248	24,271
Interest Income Recognized [Abstract]
Interest Income Recognized With No Related Allowance Recorded	130	102	494
Interest Income Recognized With An Allowance Recorded	46	73	157
Interest Income Recognized, Total	176	175	651
Interest Income Collected [Abstract]
Interest Income Collected With No Related Allowance Recorded	132	129	504
Interest Income Collected With An Allowance Recorded	46	91	148
Interest Income Collected, Total	178	220	652
Residential Real Estate [Member]
Unpaid Contractual Principal Balance [Abstract]
Unpaid Contractual Principal Balance With No Related Allowance Recorded	7,113	2,726	7,837
Unpaid Contractual Principal Balance With An Allowance Recorded	962	6,959	1,949
Unpaid Contractual Principal Balance, Total	8,075	9,685	9,786
Impaired Balance [Abstract]
Impaired Balance With No Related Allowance Recorded	5,642	2,382	6,362
Impaired Balance With An Allowance Recorded	954	5,916	1,849
Impaired Balance, Total	6,596	8,298	8,211
Related Allowance [Abstract]
Related Allowance With No Related Allowance Recorded	0	0	0
Related Allowance With An Allowance Recorded	289	1,118	526
Related Allowance, Total	289	1,118	526
Average Recorded Investment [Abstract]
Average Recorded Investment With No Related Allowance Recorded	5,642	2,382	4,564
Average Recorded Investment With An Allowance Recorded	954	5,916	3,662
Average Recorded Investment, Total	6,596	8,298	8,226
Interest Income Recognized [Abstract]
Interest Income Recognized With No Related Allowance Recorded	46	10	224
Interest Income Recognized With An Allowance Recorded	11	40	26
Interest Income Recognized, Total	57	50	250
Interest Income Collected [Abstract]
Interest Income Collected With No Related Allowance Recorded	46	18	209
Interest Income Collected With An Allowance Recorded	15	36	24
Interest Income Collected, Total	61	54	233
Farmland [Member]
Unpaid Contractual Principal Balance [Abstract]
Unpaid Contractual Principal Balance With No Related Allowance Recorded	349	2,590	303
Unpaid Contractual Principal Balance With An Allowance Recorded	1,324	0	1,327
Unpaid Contractual Principal Balance, Total	1,673	2,590	1,630
Impaired Balance [Abstract]
Impaired Balance With No Related Allowance Recorded	348	2,548	303
Impaired Balance With An Allowance Recorded	1,324	0	1,327
Impaired Balance, Total	1,672	2,548	1,630
Related Allowance [Abstract]
Related Allowance With No Related Allowance Recorded	0	0	0
Related Allowance With An Allowance Recorded	233	0	85
Related Allowance, Total	233	0	85
Average Recorded Investment [Abstract]
Average Recorded Investment With No Related Allowance Recorded	348	2,548	1,859
Average Recorded Investment With An Allowance Recorded	1,324	0	664
Average Recorded Investment, Total	1,672	2,548	2,523
Interest Income Recognized [Abstract]
Interest Income Recognized With No Related Allowance Recorded	(2)	(1)	1
Interest Income Recognized With An Allowance Recorded	0	0	45
Interest Income Recognized, Total	(2)	(1)	46
Interest Income Collected [Abstract]
Interest Income Collected With No Related Allowance Recorded	1	3	1
Interest Income Collected With An Allowance Recorded	0	0	47
Interest Income Collected, Total	1	3	48
Consumer [Member]
Unpaid Contractual Principal Balance [Abstract]
Unpaid Contractual Principal Balance With No Related Allowance Recorded	256	229	313
Unpaid Contractual Principal Balance With An Allowance Recorded	0	0	0
Unpaid Contractual Principal Balance, Total	256	229	313
Impaired Balance [Abstract]
Impaired Balance With No Related Allowance Recorded	251	217	307
Impaired Balance With An Allowance Recorded	0	0	0
Impaired Balance, Total	251	217	307
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	251	217	253
Average Recorded Investment With An Allowance Recorded	0	0	0
Average Recorded Investment, Total	251	217	253
Interest Income Recognized [Abstract]
Interest Income Recognized With No Related Allowance Recorded	4	0	18
Interest Income Recognized With An Allowance Recorded	0	0	0
Interest Income Recognized, Total	4	0	18
Interest Income Collected [Abstract]
Interest Income Collected With No Related Allowance Recorded	5	2	21
Interest Income Collected With An Allowance Recorded	0	0	0
Interest Income Collected, Total	5	2	21
Other [Member]
Unpaid Contractual Principal Balance [Abstract]
Unpaid Contractual Principal Balance With No Related Allowance Recorded	203	0	9
Unpaid Contractual Principal Balance With An Allowance Recorded	0	0	0
Unpaid Contractual Principal Balance, Total	203	0	9
Impaired Balance [Abstract]
Impaired Balance With No Related Allowance Recorded	203	0	9
Impaired Balance With An Allowance Recorded	0	0	0
Impaired Balance, Total	203	0	9
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	203	0	2
Average Recorded Investment With An Allowance Recorded	0	0	0
Average Recorded Investment, Total	203	0	2
Interest Income Recognized [Abstract]
Interest Income Recognized With No Related Allowance Recorded	2	0	1
Interest Income Recognized With An Allowance Recorded	0	0	0
Interest Income Recognized, Total	2	0	1
Interest Income Collected [Abstract]
Interest Income Collected With No Related Allowance Recorded	2	0	1
Interest Income Collected With An Allowance Recorded	0	0	0
Interest Income Collected, Total	2	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