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Loans and Leases - Schedule of Loans and Leases (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	$ 4,494,234	$ 4,261,979
Less: unearned income and deferred costs and fees	(3,721)	(3,946)
Total loans and leases, net of unearned income and deferred costs and fees	4,490,513	4,258,033
Originated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	4,170,975	3,867,868
Less: unearned income and deferred costs and fees	(3,721)	(3,946)
Total loans and leases, net of unearned income and deferred costs and fees	4,167,254	3,863,922
Acquired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	323,259	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	323,259	394,111
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,039,886	1,044,619
Commercial and industrial | Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	91,054	118,247
Commercial and industrial | Other financing receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	948,832	926,372
Commercial and industrial | Originated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	986,402	965,302
Commercial and industrial | Originated | Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	91,054	118,247
Commercial and industrial | Originated | Other financing receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	895,348	847,055
Commercial and industrial | Acquired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	53,484	79,317
Commercial and industrial | Acquired | Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	0	0
Commercial and industrial | Acquired | Other financing receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	53,484	79,317
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	2,091,145	1,920,841
Commercial real estate | Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	122,561	102,776
Commercial real estate | Other financing receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,749,840	1,673,295
Commercial real estate | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	218,744	144,770
Commercial real estate | Originated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,876,716	1,670,033
Commercial real estate | Originated | Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	122,304	102,509
Commercial real estate | Originated | Other financing receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,537,194	1,431,690
Commercial real estate | Originated | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	217,218	135,834
Commercial real estate | Acquired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	214,429	250,808
Commercial real estate | Acquired | Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	257	267
Commercial real estate | Acquired | Other financing receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	212,646	241,605
Commercial real estate | Acquired | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,526	8,936
Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,285,247	1,219,815
Residential real estate | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	244,875	247,014
Residential real estate | Mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,040,372	972,801
Residential real estate | Originated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,230,775	1,156,655
Residential real estate | Originated | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	213,570	209,277
Residential real estate | Originated | Mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,017,205	947,378
Residential real estate | Acquired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	54,472	63,160
Residential real estate | Acquired | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	31,305	37,737
Residential real estate | Acquired | Mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	23,167	25,423
Consumer and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	62,434	60,054
Consumer and other | Other financing receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	49,802	45,219
Consumer and other | Indirect
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	12,632	14,835
Consumer and other | Originated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	61,560	59,228
Consumer and other | Originated | Other financing receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	48,928	44,393
Consumer and other | Originated | Indirect
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	12,632	14,835
Consumer and other | Acquired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	874	826
Consumer and other | Acquired | Other financing receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	874	826
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	15,522	16,650
Leases | Originated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	15,522	16,650
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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