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Loans and Leases - Schedule of Loans and Leases (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	$ 4,793,446	$ 4,837,735
Less: unearned income and deferred costs and fees	(3,746)	(3,796)
Total loans and leases, net of unearned income and deferred costs and fees	4,789,700	4,833,939
Originated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	4,536,549	4,572,537
Less: unearned income and deferred costs and fees	(3,746)	(3,796)
Total loans and leases, net of unearned income and deferred costs and fees	4,532,803	4,568,741
Acquired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	256,897	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	256,897	265,198
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,048,186	1,077,635
Commercial and industrial | Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	94,737	107,494
Commercial and industrial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	953,449	970,141
Commercial and industrial | Originated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,005,521	1,033,923
Commercial and industrial | Originated | Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	94,737	107,494
Commercial and industrial | Originated | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	910,784	926,429
Commercial and industrial | Acquired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	42,665	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 | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	42,665	43,712
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	2,345,954	2,340,661
Commercial real estate | Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	170,747	170,229
Commercial real estate | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	2,006,665	2,004,763
Commercial real estate | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	168,542	165,669
Commercial real estate | Originated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	2,172,205	2,161,569
Commercial real estate | Originated | Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	170,528	170,005
Commercial real estate | Originated | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,834,496	1,827,279
Commercial real estate | Originated | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	167,181	164,285
Commercial real estate | Acquired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	173,749	179,092
Commercial real estate | Acquired | Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	219	224
Commercial real estate | Acquired | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	172,169	177,484
Commercial real estate | Acquired | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,361	1,384
Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,314,016	1,333,894
Residential real estate | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	223,124	229,608
Residential real estate | Mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,090,892	1,104,286
Residential real estate | Originated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,274,344	1,292,261
Residential real estate | Originated | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	203,538	208,459
Residential real estate | Originated | Mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,070,806	1,083,802
Residential real estate | Acquired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	39,672	41,633
Residential real estate | Acquired | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	19,586	21,149
Residential real estate | Acquired | Mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	20,086	20,484
Consumer and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	70,126	70,989
Consumer and other | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	56,696	58,326
Consumer and other | Indirect
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	13,430	12,663
Consumer and other | Originated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	69,315	70,228
Consumer and other | Originated | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	55,885	57,565
Consumer and other | Originated | Indirect
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	13,430	12,663
Consumer and other | Acquired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	811	761
Consumer and other | Acquired | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	811	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	15,164	14,556
Leases | Originated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	15,164	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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