Loans and Leases (Details 3) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	$ 3,429,878	$ 3,395,676
Less: unearned income and deferred costs and fees	(2,321)	(2,388)
Total loans and leases, net	3,427,557	3,393,288
Commercial and Industrial - Agriculture [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	58,742	78,507
Commercial and Industrial Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	800,296	785,563
Commercial and industrial, total [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	859,038	864,070
Commercial Real Estate - Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	114,876	108,333
Commercial Real Estate - Agriculture [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	62,249	62,176
Commercial Real Estate Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	1,304,132	1,288,109
Commercial real estate, total [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	1,481,257	1,458,618
Residential Real Estate - Home equity [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	241,261	242,965
Residential Real Estate - Mortgages [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	763,738	743,186
Residential real estate, total [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	1,004,999	986,151
Consumer and other - Indirect [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	17,716	18,298
Consumer and other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	36,994	36,969
Consumer and other, total [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	54,710	55,267
Finance Leases [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	13,106	12,251
Covered Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	16,768	19,319
Originated Loans and Leases [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	2,885,247	2,824,384
Total loans and leases	2,900,854	2,842,362
90 days and accruing	236	106
Nonaccrual	13,811	14,299
Less: unearned income and deferred costs and fees	(2,321)	(2,388)
Total loans and leases, net	2,898,533	2,839,974
Originated Loans and Leases [Member] | 30 - 89 Days [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	2,438	6,849
Originated Loans and Leases [Member] | 90 Days or More [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	13,169	11,129
Originated Loans and Leases [Member] | Commercial and Industrial - Agriculture [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	58,742	78,507
Total loans and leases	58,742	78,507
Originated Loans and Leases [Member] | Commercial and Industrial Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	705,666	686,311
Total loans and leases	707,283	688,529
Nonaccrual	960	1,435
Originated Loans and Leases [Member] | Commercial and Industrial Other [Member] | 30 - 89 Days [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	389	889
Originated Loans and Leases [Member] | Commercial and Industrial Other [Member] | 90 Days or More [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	1,228	1,329
Originated Loans and Leases [Member] | Commercial and industrial, total [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	764,408	764,818
Total loans and leases	766,025	767,036
Nonaccrual	960	1,435
Originated Loans and Leases [Member] | Commercial and industrial, total [Member] | 30 - 89 Days [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	389	889
Originated Loans and Leases [Member] | Commercial and industrial, total [Member] | 90 Days or More [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	1,228	1,329
Originated Loans and Leases [Member] | Commercial Real Estate - Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	70,657	72,221
Total loans and leases	70,657	72,427
Originated Loans and Leases [Member] | Commercial Real Estate - Construction [Member] | 30 - 89 Days [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		206
Originated Loans and Leases [Member] | Commercial Real Estate - Agriculture [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	59,905	58,889
Total loans and leases	59,905	58,994
Nonaccrual	115	131
Originated Loans and Leases [Member] | Commercial Real Estate - Agriculture [Member] | 90 Days or More [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		105
Originated Loans and Leases [Member] | Commercial Real Estate Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	1,012,355	975,614
Total loans and leases	1,016,309	979,621
Nonaccrual	4,510	4,911
Originated Loans and Leases [Member] | Commercial Real Estate Other [Member] | 30 - 89 Days [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	573	760
Originated Loans and Leases [Member] | Commercial Real Estate Other [Member] | 90 Days or More [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	3,381	3,247
Originated Loans and Leases [Member] | Commercial real estate, total [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	1,142,917	1,106,724
Total loans and leases	1,146,871	1,111,042
Nonaccrual	4,625	5,042
Originated Loans and Leases [Member] | Commercial real estate, total [Member] | 30 - 89 Days [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	573	966
Originated Loans and Leases [Member] | Commercial real estate, total [Member] | 90 Days or More [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	3,381	3,352
Originated Loans and Leases [Member] | Residential Real Estate - Home equity [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	186,383	184,482
Total loans and leases	188,546	186,957
90 days and accruing	59	59
Nonaccrual	1,374	1,279
Originated Loans and Leases [Member] | Residential Real Estate - Home equity [Member] | 30 - 89 Days [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	117	1,414
Originated Loans and Leases [Member] | Residential Real Estate - Home equity [Member] | 90 Days or More [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	2,046	1,061
Originated Loans and Leases [Member] | Residential Real Estate - Mortgages [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	725,273	702,633
Total loans and leases	732,643	710,904
90 days and accruing	177	47
Nonaccrual	6,609	6,194
Originated Loans and Leases [Member] | Residential Real Estate - Mortgages [Member] | 30 - 89 Days [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	1,041	2,963
Originated Loans and Leases [Member] | Residential Real Estate - Mortgages [Member] | 90 Days or More [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	6,329	5,308
Originated Loans and Leases [Member] | Residential real estate, total [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	911,656	887,115
Total loans and leases	921,189	897,861
90 days and accruing	236	106
Nonaccrual	7,983	7,473
Originated Loans and Leases [Member] | Residential real estate, total [Member] | 30 - 89 Days [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	1,158	4,377
Originated Loans and Leases [Member] | Residential real estate, total [Member] | 90 Days or More [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	8,375	6,369
Originated Loans and Leases [Member] | Consumer and other - Indirect [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	17,369	17,681
Total loans and leases	17,716	18,298
Nonaccrual	62	101
Originated Loans and Leases [Member] | Consumer and other - Indirect [Member] | 30 - 89 Days [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	308	542
Originated Loans and Leases [Member] | Consumer and other - Indirect [Member] | 90 Days or More [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	39	75
Originated Loans and Leases [Member] | Consumer and other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	35,791	35,795
Total loans and leases	35,947	35,874
Nonaccrual	181	248
Originated Loans and Leases [Member] | Consumer and other [Member] | 30 - 89 Days [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	10	75
Originated Loans and Leases [Member] | Consumer and other [Member] | 90 Days or More [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	146	4
Originated Loans and Leases [Member] | Consumer and other, total [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	53,160	53,476
Total loans and leases	53,663	54,172
Nonaccrual	243	349
Originated Loans and Leases [Member] | Consumer and other, total [Member] | 30 - 89 Days [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	318	617
Originated Loans and Leases [Member] | Consumer and other, total [Member] | 90 Days or More [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	185	79
Originated Loans and Leases [Member] | Finance Leases [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	13,106	12,251
Total loans and leases	13,106	12,251
Acquired Loans and Leases [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	519,472	544,237
Total loans and leases	529,024	553,314
90 days and accruing	3,493	3,528
Nonaccrual	4,683	4,729
Total loans and leases, net	529,024	553,314
Acquired Loans and Leases [Member] | 30 - 89 Days [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	3,093	1,719
Acquired Loans and Leases [Member] | 90 Days or More [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	6,459	7,358
Acquired Loans and Leases [Member] | Commercial and Industrial Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	92,238	95,873
Total loans and leases	93,013	97,034
90 days and accruing	486	475
Nonaccrual	669	681
Acquired Loans and Leases [Member] | Commercial and Industrial Other [Member] | 30 - 89 Days [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		5
Acquired Loans and Leases [Member] | Commercial and Industrial Other [Member] | 90 Days or More [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	775	1,156
Acquired Loans and Leases [Member] | Commercial and industrial, total [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	92,238	95,873
Total loans and leases	93,013	97,034
90 days and accruing	486	475
Nonaccrual	669	681
Acquired Loans and Leases [Member] | Commercial and industrial, total [Member] | 30 - 89 Days [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		5
Acquired Loans and Leases [Member] | Commercial and industrial, total [Member] | 90 Days or More [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	775	1,156
Acquired Loans and Leases [Member] | Commercial Real Estate - Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	42,500	34,147
Total loans and leases	44,219	35,906
90 days and accruing	1,347	1,385
Nonaccrual	372	436
Acquired Loans and Leases [Member] | Commercial Real Estate - Construction [Member] | 90 Days or More [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	1,719	1,759
Acquired Loans and Leases [Member] | Commercial Real Estate - Agriculture [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	2,344	3,182
Total loans and leases	2,344	3,182
Acquired Loans and Leases [Member] | Commercial Real Estate Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	284,560	306,570
Total loans and leases	287,823	308,488
90 days and accruing	116	77
Nonaccrual	2,061	2,042
Acquired Loans and Leases [Member] | Commercial Real Estate Other [Member] | 30 - 89 Days [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	1,412
Acquired Loans and Leases [Member] | Commercial Real Estate Other [Member] | 90 Days or More [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	1,851	1,918
Acquired Loans and Leases [Member] | Commercial real estate, total [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	329,404	343,899
Total loans and leases	334,386	347,576
90 days and accruing	1,463	1,462
Nonaccrual	2,433	2,478
Acquired Loans and Leases [Member] | Commercial real estate, total [Member] | 30 - 89 Days [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	1,412
Acquired Loans and Leases [Member] | Commercial real estate, total [Member] | 90 Days or More [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	3,570	3,677
Acquired Loans and Leases [Member] | Residential Real Estate - Home equity [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	51,969	55,169
Total loans and leases	52,715	56,008
90 days and accruing	190	177
Nonaccrual	616	592
Acquired Loans and Leases [Member] | Residential Real Estate - Home equity [Member] | 30 - 89 Days [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	197	135
Acquired Loans and Leases [Member] | Residential Real Estate - Home equity [Member] | 90 Days or More [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	549	704
Acquired Loans and Leases [Member] | Residential Real Estate - Mortgages [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	29,275	30,334
Total loans and leases	31,095	32,282
90 days and accruing	672	500
Nonaccrual	965	978
Acquired Loans and Leases [Member] | Residential Real Estate - Mortgages [Member] | 30 - 89 Days [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	937	1,041
Acquired Loans and Leases [Member] | Residential Real Estate - Mortgages [Member] | 90 Days or More [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	883	907
Acquired Loans and Leases [Member] | Residential real estate, total [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	81,244	85,503
Total loans and leases	83,810	88,290
90 days and accruing	862	677
Nonaccrual	1,581	1,570
Acquired Loans and Leases [Member] | Residential real estate, total [Member] | 30 - 89 Days [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	1,134	1,176
Acquired Loans and Leases [Member] | Residential real estate, total [Member] | 90 Days or More [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	1,432	1,611
Acquired Loans and Leases [Member] | Consumer and other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	1,047	1,090
Total loans and leases	1,047	1,095
Acquired Loans and Leases [Member] | Consumer and other [Member] | 30 - 89 Days [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		5
Acquired Loans and Leases [Member] | Consumer and other, total [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	1,047	1,090
Total loans and leases	1,047	1,095
Acquired Loans and Leases [Member] | Consumer and other, total [Member] | 30 - 89 Days [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		5
Acquired Loans and Leases [Member] | Covered Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	15,539	17,872
Total loans and leases	16,768	19,319
90 days and accruing	682	914
Acquired Loans and Leases [Member] | Covered Loans [Member] | 30 - 89 Days [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	547	533
Acquired Loans and Leases [Member] | Covered Loans [Member] | 90 Days or More [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	$ 682	$ 914