Allowance for Loan Losses (Details 4) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Aging of recorded investment in loans by past due category and class of loans
30-59 Days Past Due	$ 8,213	$ 21,884
60-89 Days Past Due	3,800	4,532
Greater than 90 days Past Due	17,201	18,650
Total Past Due	29,214	45,066
Current	1,788,659	1,816,866
Total	1,817,873	1,861,932
Commercial & Industrial
Aging of recorded investment in loans by past due category and class of loans
30-59 Days Past Due	1,863	1,315
60-89 Days Past Due	1,096	861
Greater than 90 days Past Due	10,830	3,616
Total Past Due	13,789	5,792
Current	466,057	487,160
Total	479,846	492,952
Farmland
Aging of recorded investment in loans by past due category and class of loans
30-59 Days Past Due	58	534
60-89 Days Past Due	0	0
Greater than 90 days Past Due	123	1,122
Total Past Due	181	1,656
Current	85,479	87,270
Total	85,660	88,926
Non Farm, Non Residential
Aging of recorded investment in loans by past due category and class of loans
30-59 Days Past Due	204	5,618
60-89 Days Past Due	464	1,004
Greater than 90 days Past Due	3,080	2,449
Total Past Due	3,748	9,071
Current	255,676	290,023
Total	259,424	299,094
Agriculture
Aging of recorded investment in loans by past due category and class of loans
30-59 Days Past Due	280	137
60-89 Days Past Due	0	0
Greater than 90 days Past Due	1	78
Total Past Due	281	215
Current	129,151	130,404
Total	129,432	130,619
All Other Commercial
Aging of recorded investment in loans by past due category and class of loans
30-59 Days Past Due	260	568
60-89 Days Past Due	102	202
Greater than 90 days Past Due	0	350
Total Past Due	362	1,120
Current	108,605	81,453
Total	108,967	82,573
First Liens
Aging of recorded investment in loans by past due category and class of loans
30-59 Days Past Due	1,701	8,359
60-89 Days Past Due	1,563	1,659
Greater than 90 days Past Due	1,889	4,599
Total Past Due	5,153	14,617
Current	331,226	336,230
Total	336,379	350,847
Home Equity
Aging of recorded investment in loans by past due category and class of loans
30-59 Days Past Due	177	143
60-89 Days Past Due	9	15
Greater than 90 days Past Due	22	24
Total Past Due	208	182
Current	42,288	43,317
Total	42,496	43,499
Junior Liens
Aging of recorded investment in loans by past due category and class of loans
30-59 Days Past Due	248	555
60-89 Days Past Due	57	98
Greater than 90 days Past Due	659	586
Total Past Due	964	1,239
Current	32,864	36,535
Total	33,828	37,774
Multifamily
Aging of recorded investment in loans by past due category and class of loans
30-59 Days Past Due	20	52
60-89 Days Past Due	0	0
Greater than 90 days Past Due	404	5,641
Total Past Due	424	5,693
Current	60,584	49,019
Total	61,008	54,712
All Other Residential
Aging of recorded investment in loans by past due category and class of loans
30-59 Days Past Due	0	214
60-89 Days Past Due	26	0
Greater than 90 days Past Due	0	0
Total Past Due	26	214
Current	10,289	10,834
Total	10,315	11,048
Motor Vehicle
Aging of recorded investment in loans by past due category and class of loans
30-59 Days Past Due	3,250	4,164
60-89 Days Past Due	474	600
Greater than 90 days Past Due	189	182
Total Past Due	3,913	4,946
Current	244,281	241,303
Total	248,194	246,249
All Other Consumer
Aging of recorded investment in loans by past due category and class of loans
30-59 Days Past Due	152	225
60-89 Days Past Due	9	93
Greater than 90 days Past Due	4	3
Total Past Due	165	321
Current	22,159	23,318
Total	$ 22,324	$ 23,639