Allowance for Loan Losses (Details 4) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Aging of recorded investment in loans by past due category and class of loans
30-59 Days Past Due	$ 7,459	$ 12,277
60-89 Days Past Due	996	2,145
Greater than 90 days Past Due	5,850	5,987
Total Past Due	14,305	20,409
Current	1,748,650	1,768,416
Total	1,762,955	1,788,825
Commercial & Industrial
Aging of recorded investment in loans by past due category and class of loans
30-59 Days Past Due	835	574
60-89 Days Past Due	190	416
Greater than 90 days Past Due	3,425	3,046
Total Past Due	4,450	4,036
Current	473,658	451,549
Total	478,108	455,585
Farmland
Aging of recorded investment in loans by past due category and class of loans
30-59 Days Past Due	42	0
60-89 Days Past Due	0	0
Greater than 90 days Past Due	0	0
Total Past Due	42	0
Current	95,681	95,452
Total	95,723	95,452
Non Farm, Non Residential
Aging of recorded investment in loans by past due category and class of loans
30-59 Days Past Due	299	1,528
60-89 Days Past Due	76	68
Greater than 90 days Past Due	257	202
Total Past Due	632	1,798
Current	224,880	232,440
Total	225,512	234,238
Agriculture
Aging of recorded investment in loans by past due category and class of loans
30-59 Days Past Due	126	246
60-89 Days Past Due	0	18
Greater than 90 days Past Due	177	502
Total Past Due	303	766
Current	127,201	149,099
Total	127,504	149,865
All Other Commercial
Aging of recorded investment in loans by past due category and class of loans
30-59 Days Past Due	100	255
60-89 Days Past Due	0	0
Greater than 90 days Past Due	257	0
Total Past Due	357	255
Current	119,957	115,014
Total	120,314	115,269
First Liens
Aging of recorded investment in loans by past due category and class of loans
30-59 Days Past Due	3,186	6,011
60-89 Days Past Due	363	963
Greater than 90 days Past Due	1,242	1,522
Total Past Due	4,791	8,496
Current	306,789	308,068
Total	311,580	316,564
Home Equity
Aging of recorded investment in loans by past due category and class of loans
30-59 Days Past Due	146	141
60-89 Days Past Due	18	33
Greater than 90 days Past Due	191	310
Total Past Due	355	484
Current	38,215	40,043
Total	38,570	40,527
Junior Liens
Aging of recorded investment in loans by past due category and class of loans
30-59 Days Past Due	316	270
60-89 Days Past Due	64	83
Greater than 90 days Past Due	184	217
Total Past Due	564	570
Current	30,966	31,487
Total	31,530	32,057
Multifamily
Aging of recorded investment in loans by past due category and class of loans
30-59 Days Past Due	174	0
60-89 Days Past Due	0	0
Greater than 90 days Past Due	0	0
Total Past Due	174	0
Current	60,595	72,310
Total	60,769	72,310
All Other Residential
Aging of recorded investment in loans by past due category and class of loans
30-59 Days Past Due	22	112
60-89 Days Past Due	0	0
Greater than 90 days Past Due	6	5
Total Past Due	28	117
Current	7,656	8,961
Total	7,684	9,078
Motor Vehicle
Aging of recorded investment in loans by past due category and class of loans
30-59 Days Past Due	2,156	3,026
60-89 Days Past Due	285	557
Greater than 90 days Past Due	106	180
Total Past Due	2,547	3,763
Current	242,859	242,406
Total	245,406	246,169
All Other Consumer
Aging of recorded investment in loans by past due category and class of loans
30-59 Days Past Due	57	114
60-89 Days Past Due	0	7
Greater than 90 days Past Due	5	3
Total Past Due	62	124
Current	20,193	21,587
Total	$ 20,255	$ 21,711