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Loans (Schedule of Carrying Amount of Loans with Deterioration of Credit Quality) (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total | $ 2,732,452 | [1] | $ 2,744,042 | [2]
Commercial and Industrial Loans and Leases |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total | 555,935 | [1] | 545,342 | [2]
Commercial Real Estate Loans |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total | 1,216,906 | [1] | 1,211,882 | [2]
Agricultural Loans |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total | 368,912 | [1] | 370,694 | [2]
Home Equity Loans |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total | 204,350 | [1] | 209,009 | [2]
Residential Mortgage Loans |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total | 308,525 | [1] | 329,354 | [2]
Loans Acquired With Deteriorated Credit Quality |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total | 10,029 |  | 11,556 |
Carrying Amount, Net of Allowance | 9,626 |  | 11,548 |
Loans Acquired With Deteriorated Credit Quality | Commercial and Industrial Loans and Leases |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total | 882 |  | 1,038 |
Loans Acquired With Deteriorated Credit Quality | Commercial Real Estate Loans |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total | 5,629 |  | 6,993 |
Loans Acquired With Deteriorated Credit Quality | Agricultural Loans |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total | 1,882 |  | 1,877 |
Loans Acquired With Deteriorated Credit Quality | Home Equity Loans |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total | 368 |  | 365 |
Loans Acquired With Deteriorated Credit Quality | Residential Mortgage Loans |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total | $ 1,268 |  | $ 1,283 |
[1] | Total recorded investment in loans includes $11,778 in accrued interest.
[2] | Total recorded investment in loans includes $12,301 in accrued interest.

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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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- Definition Amount, after allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919230-210447 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -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 + Details
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