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Loans and Leases - Schedule of Loans and Leases (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	$ 4,921,195	$ 4,837,735
Less: unearned income and deferred costs and fees	(3,645)	(3,796)
Total originated loans and leases, net of unearned income and deferred costs and fees	4,917,550	4,833,939
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,008,061	1,077,635
Commercial and industrial | Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	105,786	107,494
Commercial and industrial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	902,275	970,141
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	2,443,565	2,340,661
Commercial real estate | Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	184,898	170,229
Commercial real estate | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	2,045,030	2,004,763
Commercial real estate | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	213,637	165,669
Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,377,837	1,333,894
Residential real estate | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	219,245	229,608
Consumer and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	74,410	70,989
Consumer and other | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	61,446	58,326
Consumer and other | Indirect
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	12,964	12,663
Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	17,322	14,556
Originated Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	4,701,046	4,572,537
Less: unearned income and deferred costs and fees	(3,645)	(3,796)
Total originated loans and leases, net of unearned income and deferred costs and fees	4,697,401	4,568,741
Originated Loans and Leases | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	968,985	1,033,923
Originated Loans and Leases | Commercial and industrial | Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	105,786	107,494
Originated Loans and Leases | Commercial and industrial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	863,199	926,429
Originated Loans and Leases | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	2,296,648	2,161,569
Originated Loans and Leases | Commercial real estate | Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	184,701	170,005
Originated Loans and Leases | Commercial real estate | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,899,645	1,827,279
Originated Loans and Leases | Commercial real estate | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	212,302	164,285
Originated Loans and Leases | Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,344,466	1,292,261
Originated Loans and Leases | Residential real estate | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	203,894	208,459
Originated Loans and Leases | Consumer and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	73,625	70,228
Originated Loans and Leases | Consumer and other | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	60,661	57,565
Originated Loans and Leases | Consumer and other | Indirect
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	12,964	12,663
Originated Loans and Leases | Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	17,322	14,556
Acquired Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	220,149	265,198
Less: unearned income and deferred costs and fees	0	0
Total originated loans and leases, net of unearned income and deferred costs and fees	220,149	265,198
Acquired Loans and Leases | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	39,076	43,712
Acquired Loans and Leases | Commercial and industrial | Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	0	0
Acquired Loans and Leases | Commercial and industrial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	39,076	43,712
Acquired Loans and Leases | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	146,917	179,092
Acquired Loans and Leases | Commercial real estate | Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	197	224
Acquired Loans and Leases | Commercial real estate | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	145,385	177,484
Acquired Loans and Leases | Commercial real estate | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,335	1,384
Acquired Loans and Leases | Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	33,371	41,633
Acquired Loans and Leases | Residential real estate | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	15,351	21,149
Acquired Loans and Leases | Consumer and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	785	761
Acquired Loans and Leases | Consumer and other | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	785	761
Acquired Loans and Leases | Consumer and other | Indirect
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	0	0
Acquired Loans and Leases | Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	$ 0	$ 0

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Amount of deferred interest and fee income, unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of acquired loans. Excludes amounts for loans and leases covered under loss sharing agreements.

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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