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Loans (Schedule of Carrying Amount of Loans with Deterioration of Credit Quality) (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loans, net of deferred income | $ 2,725,212 | [1] | $ 2,744,042 | [2]
Commercial and Industrial Loans and Leases |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loans, net of deferred income | 557,660 | [1] | 545,342 | [2]
Commercial Real Estate Loans |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loans, net of deferred income | 1,215,532 | [1] | 1,211,882 | [2]
Agricultural Loans |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loans, net of deferred income | 353,606 | [1] | 370,694 | [2]
Home Equity Loans |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loans, net of deferred income | 204,626 | [1] | 209,009 | [2]
Residential Mortgage Loans |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loans, net of deferred income | 315,432 | [1] | 329,354 | [2]
Loans Acquired With Deteriorated Credit Quality |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loans, net of deferred income | 10,472 |  | 11,556 |
Carrying Amount, Net of Allowance | 10,190 |  | 11,548 |
Loans Acquired With Deteriorated Credit Quality | Commercial and Industrial Loans and Leases |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loans, net of deferred income | 902 |  | 1,038 |
Loans Acquired With Deteriorated Credit Quality | Commercial Real Estate Loans |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loans, net of deferred income | 6,127 |  | 6,993 |
Loans Acquired With Deteriorated Credit Quality | Agricultural Loans |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loans, net of deferred income | 1,798 |  | 1,877 |
Loans Acquired With Deteriorated Credit Quality | Home Equity Loans |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loans, net of deferred income | 368 |  | 365 |
Loans Acquired With Deteriorated Credit Quality | Residential Mortgage Loans |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loans, net of deferred income | $ 1,277 |  | $ 1,283 |
[1] | Total recorded investment in loans includes $12,798 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=82891408&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=84173941&loc=d3e5074-111524 + Details
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- Definition Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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