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Loans and Leases - Schedule of Loans and Leases (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	$ 4,860,898	$ 4,837,735
Less: unearned income and deferred costs and fees	(3,825)	(3,796)
Total loans and leases, net of unearned income and deferred costs and fees	4,857,073	4,833,939
Originated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	4,632,441	4,572,537
Less: unearned income and deferred costs and fees	(3,825)	(3,796)
Total loans and leases, net of unearned income and deferred costs and fees	4,628,616	4,568,741
Acquired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	228,457	265,198
Less: unearned income and deferred costs and fees	0	0
Total loans and leases, net of unearned income and deferred costs and fees	228,457	265,198
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	994,505	1,077,635
Commercial and industrial | Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	94,302	107,494
Commercial and industrial | Consumer Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	900,203	970,141
Commercial and industrial | Originated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	954,734	1,033,923
Commercial and industrial | Originated | Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	94,302	107,494
Commercial and industrial | Originated | Consumer Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	860,432	926,429
Commercial and industrial | Acquired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	39,771	43,712
Commercial and industrial | Acquired | Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	0	0
Commercial and industrial | Acquired | Consumer Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	39,771	43,712
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	2,426,770	2,340,661
Commercial real estate | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	192,015	165,669
Commercial real estate | Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	180,593	170,229
Commercial real estate | Consumer Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	2,054,162	2,004,763
Commercial real estate | Originated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	2,273,981	2,161,569
Commercial real estate | Originated | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	190,657	164,285
Commercial real estate | Originated | Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	180,385	170,005
Commercial real estate | Originated | Consumer Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,902,939	1,827,279
Commercial real estate | Acquired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	152,789	179,092
Commercial real estate | Acquired | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,358	1,384
Commercial real estate | Acquired | Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	208	224
Commercial real estate | Acquired | Consumer Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	151,223	177,484
Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,347,320	1,333,894
Residential real estate | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	221,538	229,608
Residential real estate | Mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,125,782	1,104,286
Residential real estate | Originated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,312,197	1,292,261
Residential real estate | Originated | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	205,050	208,459
Residential real estate | Originated | Mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,107,147	1,083,802
Residential real estate | Acquired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	35,123	41,633
Residential real estate | Acquired | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	16,488	21,149
Residential real estate | Acquired | Mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	18,635	20,484
Consumer and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	75,174	70,989
Consumer and other | Consumer Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	61,563	58,326
Consumer and other | Indirect
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	13,611	12,663
Consumer and other | Originated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	74,400	70,228
Consumer and other | Originated | Consumer Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	60,789	57,565
Consumer and other | Originated | Indirect
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	13,611	12,663
Consumer and other | Acquired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	774	761
Consumer and other | Acquired | Consumer Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	774	761
Consumer and other | Acquired | Indirect
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	0	0
Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	17,129	14,556
Leases | Originated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	17,129	14,556
Leases | Acquired
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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Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

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