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Loans and Leases - Schedule of Loans and Leases (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	$ 4,708,325	$ 4,672,909
Less: unearned income and deferred costs and fees	(3,479)	(3,789)
Total loans and leases, net of unearned income and deferred costs and fees	4,704,846	4,669,120
Originated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	4,411,560	4,362,332
Less: unearned income and deferred costs and fees	(3,479)	(3,789)
Total loans and leases, net of unearned income and deferred costs and fees	4,408,081	4,358,543
Acquired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	296,765	310,577
Less: unearned income and deferred costs and fees	0	0
Total loans and leases, net of unearned income and deferred costs and fees	296,765	310,577
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,060,945	1,091,651
Commercial and industrial | Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	93,896	108,608
Commercial and industrial | Commercial and industrial other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	967,049	983,043
Commercial and industrial | Originated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,010,416	1,040,675
Commercial and industrial | Originated | Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	93,896	108,608
Commercial and industrial | Originated | Commercial and industrial other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	916,520	932,067
Commercial and industrial | Acquired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	50,529	50,976
Commercial and industrial | Acquired | Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	0	0
Commercial and industrial | Acquired | Commercial and industrial other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	50,529	50,976
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	2,259,386	2,200,727
Commercial real estate | Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	135,725	129,959
Commercial real estate | Commercial and industrial other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,922,020	1,866,802
Commercial real estate | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	201,641	203,966
Commercial real estate | Originated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	2,062,343	1,992,980
Commercial real estate | Originated | Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	135,484	129,712
Commercial real estate | Originated | Commercial and industrial other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,726,674	1,660,782
Commercial real estate | Originated | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	200,185	202,486
Commercial real estate | Acquired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	197,043	207,747
Commercial real estate | Acquired | Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	241	247
Commercial real estate | Acquired | Commercial and industrial other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	195,346	206,020
Commercial real estate | Acquired | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,456	1,480
Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,311,443	1,302,941
Residential real estate | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	237,528	241,256
Residential real estate | Mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,073,915	1,061,685
Residential real estate | Originated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,263,155	1,251,852
Residential real estate | Originated | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	211,444	212,812
Residential real estate | Originated | Mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,051,711	1,039,040
Residential real estate | Acquired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	48,288	51,089
Residential real estate | Acquired | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	26,084	28,444
Residential real estate | Acquired | Mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	22,204	22,645
Consumer and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	62,733	63,123
Consumer and other | Commercial and industrial other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	50,812	50,979
Consumer and other | Indirect
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	11,921	12,144
Consumer and other | Originated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	61,828	62,358
Consumer and other | Originated | Commercial and industrial other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	49,907	50,214
Consumer and other | Originated | Indirect
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	11,921	12,144
Consumer and other | Acquired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	905	765
Consumer and other | Acquired | Commercial and industrial other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	905	765
Consumer and other | Acquired | Indirect
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	0	0
Finance Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	13,818	14,467
Finance Leases | Originated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	13,818	14,467
Finance 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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