Loans and Leases (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	$ 4,422,513	$ 4,261,979
Less: unearned income and deferred costs and fees	(3,917)	(3,946)
Total loans and leases, net of unearned income and deferred costs and fees	4,418,596	4,258,033
Commercial and industrial - Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	89,017	118,247
Commercial and industrial other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,039,025	926,372
Commercial and industrial, total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,128,042	1,044,619
Commercial real estate - Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	97,160	144,770
Commercial real estate - Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	120,900	102,776
Commercial real estate other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,730,157	1,673,295
Commercial real estate, total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,948,217	1,920,841
Residential real estate - Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	244,709	247,014
Residential real estate - Mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,025,356	972,801
Residential real estate, total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,270,065	1,219,815
Consumer Indirect
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	13,088	14,835
Consumer Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	47,170	45,219
Consumer and other, total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	60,258	60,054
Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	15,931	16,650
Originated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	4,074,672	3,867,868
Less: unearned income and deferred costs and fees	(3,917)	(3,946)
Total loans and leases, net of unearned income and deferred costs and fees	4,070,755	3,863,922
Originated | Commercial and industrial - Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	89,017	118,247
Originated | Commercial and industrial other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	977,891	847,055
Originated | Commercial and industrial, total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,066,908	965,302
Originated | Commercial real estate - Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	95,634	135,834
Originated | Commercial real estate - Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	120,643	102,509
Originated | Commercial real estate other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,503,385	1,431,690
Originated | Commercial real estate, total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,719,662	1,670,033
Originated | Residential real estate - Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	211,179	209,277
Originated | Residential real estate - Mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,001,630	947,378
Originated | Residential real estate, total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,212,809	1,156,655
Originated | Consumer Indirect
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	13,088	14,835
Originated | Consumer Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	46,274	44,393
Originated | Consumer and other, total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	59,362	59,228
Originated | Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	15,931	16,650
Acquired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	347,841	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	347,841	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	61,134	79,317
Acquired | Commercial and industrial, total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	61,134	79,317
Acquired | Commercial real estate - Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,526	8,936
Acquired | Commercial real estate - Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	257	267
Acquired | Commercial real estate other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	226,772	241,605
Acquired | Commercial real estate, total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	228,555	250,808
Acquired | Residential real estate - Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	33,530	37,737
Acquired | Residential real estate - Mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	23,726	25,423
Acquired | Residential real estate, total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	57,256	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	896	826
Acquired | Consumer and other, total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	896	826
Acquired | Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	$ 0	$ 0