Loans and Leases - Schedule of Loans and Leases (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	$ 4,941,469	$ 4,921,195
Less: unearned income and deferred costs and fees	(3,647)	(3,645)
Total loans and leases, net of unearned income and deferred costs and fees	4,937,822	4,917,550
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	983,228	1,008,061
Commercial and industrial | Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	95,385	105,786
Total loans and leases, net of unearned income and deferred costs and fees	95,385
Commercial and industrial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	887,843	902,275
Total loans and leases, net of unearned income and deferred costs and fees	887,843
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	2,476,450	2,443,565
Commercial real estate | Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	187,061	184,898
Total loans and leases, net of unearned income and deferred costs and fees	187,061
Commercial real estate | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	2,120,939	2,045,030
Total loans and leases, net of unearned income and deferred costs and fees	2,120,939
Commercial real estate | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	168,450	213,637
Total loans and leases, net of unearned income and deferred costs and fees	168,450
Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,391,713	1,377,837
Residential real estate | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	215,740	219,245
Total loans and leases, net of unearned income and deferred costs and fees	215,740
Residential real estate | Mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,175,973	1,158,592
Total loans and leases, net of unearned income and deferred costs and fees	1,175,973
Consumer and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	73,032	74,410
Consumer and other | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	61,161	61,446
Consumer and other | Indirect
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	11,871	12,964
Total loans and leases, net of unearned income and deferred costs and fees	11,871
Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	17,046	17,322
Originated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	4,727,924	4,701,046
Less: unearned income and deferred costs and fees	(3,647)	(3,645)
Total loans and leases, net of unearned income and deferred costs and fees	4,724,277	4,697,401
Originated | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	944,658	968,985
Originated | Commercial and industrial | Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	95,385	105,786
Originated | Commercial and industrial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	849,273	863,199
Originated | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	2,334,273	2,296,648
Originated | Commercial real estate | Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	186,870	184,701
Originated | Commercial real estate | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,980,264	1,899,645
Originated | Commercial real estate | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	167,139	212,302
Originated | Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,359,775	1,344,466
Originated | Residential real estate | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	201,231	203,894
Originated | Residential real estate | Mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,158,544	1,140,572
Originated | Consumer and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	72,172	73,625
Originated | Consumer and other | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	60,301	60,661
Originated | Consumer and other | Indirect
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	11,871	12,964
Originated | Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	17,046	17,322
Acquired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	213,545	220,149
Less: unearned income and deferred costs and fees	0	0
Total loans and leases, net of unearned income and deferred costs and fees	213,545	220,149
Acquired | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	38,570	39,076
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	38,570	39,076
Acquired | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	142,177	146,917
Acquired | Commercial real estate | Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	191	197
Acquired | Commercial real estate | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	140,675	145,385
Acquired | Commercial real estate | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,311	1,335
Acquired | Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	31,938	33,371
Acquired | Residential real estate | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	14,509	15,351
Acquired | Residential real estate | Mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	17,429	18,020
Acquired | Consumer and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	860	785
Acquired | Consumer and other | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	860	785
Acquired | Consumer and other | Indirect
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	0	0
Acquired | Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	$ 0	$ 0