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Loans (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Summary of Loans [Abstract] |  |
Net Loans | $ 7,136,098 | $ 6,887,709
Deferred loan origination costs, net | 35,300 | 43,500
Residential loans held for sale | 11,500 | 6,900
Loans serviced for unrelated third parties | 612,300 | 557,900
Mortgage servicing rights | 800 | 500
Loans and Leases Receivable, Related Parties [Roll Forward] |  |
Balance at January 1 | 1,638 | 1,577
New loans | 587 | 260
Adjustment due to change in composition of related parties | 389 | 0
Repayments | (448) | (199)
Balance at December 31 | 2,166 | 1,638
Commercial Loans [Member] |  |
Summary of Loans [Abstract] |  |
Net Loans | 3,444,266 | 3,222,310
Commercial Loans [Member] | Commercial [Member] |  |
Summary of Loans [Abstract] |  |
Net Loans | 1,302,209 | 1,291,568
Commercial Loans [Member] | Commercial Real Estate [Member] |  |
Summary of Loans [Abstract] |  |
Net Loans | 2,142,057 | 1,930,742
Commercial Loans [Member] | Agricultural and Agricultural Real Estate Mortgages [Member] |  |
Summary of Loans [Abstract] |  |
Loans serviced for unrelated third parties | 25,600 | 27,200
Residential Real Estate [Member] |  |
Summary of Loans [Abstract] |  |
Net Loans | 1,445,156 | 1,380,836
Consumer Loans [Member] |  |
Summary of Loans [Abstract] |  |
Net Loans | 2,246,676 | 2,284,563
Consumer Loans [Member] | Indirect Auto [Member] |  |
Summary of Loans [Abstract] |  |
Net Loans | 1,193,635 | 1,216,144
Consumer Loans [Member] | Specialty Lending [Member] |  |
Summary of Loans [Abstract] |  |
Net Loans | 542,063 | 524,928
Consumer Loans [Member] | Home Equity [Member] |  |
Summary of Loans [Abstract] |  |
Net Loans | 444,082 | 474,566
Consumer Loans [Member] | Other Consumer [Member] |  |
Summary of Loans [Abstract] |  |
Net Loans | $ 66,896 | $ 68,925

X
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118952595&loc=d3e4428-111522 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5074-111524 + Details
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