Loans and Leases (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	$ 3,823,818	$ 3,774,832
Less: unearned income and deferred costs and fees	(2,905)	(2,790)
Total loans and leases, net of unearned income and deferred costs and fees	3,820,913	3,772,042
Commercial and Industrial - Agriculture [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	74,890	88,299
Commercial and Industrial Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	855,589	852,834
Commercial and industrial, total [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	930,479	941,133
Commercial Real Estate - Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	117,693	107,929
Commercial Real Estate - Agriculture [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	96,313	89,030
Commercial Real Estate Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,492,213	1,452,202
Commercial real estate, total [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,706,219	1,649,161
Residential Real Estate - Home equity [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	240,087	244,670
Residential Real Estate - Mortgages [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	861,169	851,332
Residential real estate, total [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,101,256	1,096,002
Consumer Indirect [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	17,714	17,829
Consumer Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	40,987	41,815
Consumer and other, total [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	58,701	59,644
Leases [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	14,426	14,861
Covered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	12,737	14,031
Originated Loans and Leases [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	3,373,696	3,313,558
Less: unearned income and deferred costs and fees	(2,905)	(2,790)
Total loans and leases, net of unearned income and deferred costs and fees	3,370,791	3,310,768
Originated Loans and Leases [Member] | Commercial and Industrial - Agriculture [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	74,890	88,299
Originated Loans and Leases [Member] | Commercial and Industrial Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	769,047	768,024
Originated Loans and Leases [Member] | Commercial and industrial, total [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	843,937	856,323
Originated Loans and Leases [Member] | Commercial Real Estate - Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	115,584	103,037
Originated Loans and Leases [Member] | Commercial Real Estate - Agriculture [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	94,300	86,935
Originated Loans and Leases [Member] | Commercial Real Estate Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,214,190	1,167,250
Originated Loans and Leases [Member] | Commercial real estate, total [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,424,074	1,357,222
Originated Loans and Leases [Member] | Residential Real Estate - Home equity [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	199,245	202,578
Originated Loans and Leases [Member] | Residential Real Estate - Mortgages [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	834,298	823,841
Originated Loans and Leases [Member] | Residential real estate, total [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,033,543	1,026,419
Originated Loans and Leases [Member] | Consumer Indirect [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	17,714	17,829
Originated Loans and Leases [Member] | Consumer Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	40,002	40,904
Originated Loans and Leases [Member] | Consumer and other, total [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	57,716	58,733
Originated Loans and Leases [Member] | Leases [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	14,426	14,861
Originated Loans and Leases [Member] | Covered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	0	0
Acquired Loans and Leases [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	450,122	461,274
Less: unearned income and deferred costs and fees	0	0
Total loans and leases, net of unearned income and deferred costs and fees	450,122	461,274
Acquired Loans and Leases [Member] | Commercial and Industrial - Agriculture [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	0	0
Acquired Loans and Leases [Member] | Commercial and Industrial Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	86,542	84,810
Acquired Loans and Leases [Member] | Commercial and industrial, total [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	86,542	84,810
Acquired Loans and Leases [Member] | Commercial Real Estate - Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	2,109	4,892
Acquired Loans and Leases [Member] | Commercial Real Estate - Agriculture [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	2,013	2,095
Acquired Loans and Leases [Member] | Commercial Real Estate Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	278,023	284,952
Acquired Loans and Leases [Member] | Commercial real estate, total [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	282,145	291,939
Acquired Loans and Leases [Member] | Residential Real Estate - Home equity [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	40,842	42,092
Acquired Loans and Leases [Member] | Residential Real Estate - Mortgages [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	26,871	27,491
Acquired Loans and Leases [Member] | Residential real estate, total [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	67,713	69,583
Acquired Loans and Leases [Member] | Consumer Indirect [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	0	0
Acquired Loans and Leases [Member] | Consumer Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	985	911
Acquired Loans and Leases [Member] | Consumer and other, total [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	985	911
Acquired Loans and Leases [Member] | Leases [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	0	0
Acquired Loans and Leases [Member] | Covered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	$ 12,737	$ 14,031