Loans and Leases (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	$ 4,301,931	$ 4,261,979
Less: unearned income and deferred costs and fees	(4,138)	(3,946)
Total loans and leases, net of unearned income and deferred costs and fees	4,297,793	4,258,033
Commercial and Industrial - Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	88,999	118,247
Commercial and Industrial Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	965,726	926,372
Commercial and industrial, total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,054,725	1,044,619
Commercial Real Estate - Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	144,233	144,770
Commercial Real Estate - Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	116,944	102,776
Commercial Real Estate Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,673,988	1,673,295
Commercial real estate, total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,935,165	1,920,841
Residential Real Estate - Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	245,031	247,014
Residential Real Estate - Mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	993,977	972,801
Residential real estate, total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,239,008	1,219,815
Consumer Indirect
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	13,853	14,835
Consumer Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	43,565	45,219
Consumer and other, total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	57,418	60,054
Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	15,615	16,650
Originated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	3,926,551	3,867,868
Less: unearned income and deferred costs and fees	(4,138)	(3,946)
Total loans and leases, net of unearned income and deferred costs and fees	3,922,413	3,863,922
Originated | Commercial and Industrial - Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	88,999	118,247
Originated | Commercial and Industrial Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	886,370	847,055
Originated | Commercial and industrial, total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	975,369	965,302
Originated | Commercial Real Estate - Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	142,685	135,834
Originated | Commercial Real Estate - Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	116,682	102,509
Originated | Commercial Real Estate Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,440,690	1,431,690
Originated | Commercial real estate, total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,700,057	1,670,033
Originated | Residential Real Estate - Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	209,740	209,277
Originated | Residential Real Estate - Mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	969,153	947,378
Originated | Residential real estate, total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,178,893	1,156,655
Originated | Consumer Indirect
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	13,853	14,835
Originated | Consumer Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	42,764	44,393
Originated | Consumer and other, total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	56,617	59,228
Originated | Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	15,615	16,650
Acquired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	375,380	394,111
Less: unearned income and deferred costs and fees	0	0
Total loans and leases, net of unearned income and deferred costs and fees	375,380	394,111
Acquired | Commercial and Industrial - Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	0	0
Acquired | Commercial and Industrial Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	79,356	79,317
Acquired | Commercial and industrial, total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	79,356	79,317
Acquired | Commercial Real Estate - Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,548	8,936
Acquired | Commercial Real Estate - Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	262	267
Acquired | Commercial Real Estate Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	233,298	241,605
Acquired | Commercial real estate, total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	235,108	250,808
Acquired | Residential Real Estate - Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	35,291	37,737
Acquired | Residential Real Estate - Mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	24,824	25,423
Acquired | Residential real estate, total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	60,115	63,160
Acquired | Consumer Indirect
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	0	0
Acquired | Consumer Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	801	826
Acquired | Consumer and other, total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	801	826
Acquired | Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	0	0
Acquired | Covered Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	$ 0	$ 0