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Loans (Schedule of Allowance for Loan Losses and Recorded Investment in Loans) (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017
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Allowance for Loan Losses: |  |  |  |  |  |  |  |
Individually Evaluated for Impairment | $ 1,550 |  |  | $ 1,823 |  |  |  |
Collectively Evaluated for Impairment | 14,327 |  |  | 13,992 |  |  |  |
Total Ending Allowance Balance | 16,239 |  | $ 16,243 | 15,823 |  | $ 15,637 | $ 14,460 | $ 15,694
Loans: |  |  |  |  |  |  |  |
Loans Individually Evaluated for Impairment | 6,047 |  |  | 9,619 |  |  |  |
Loans Collectively Evaluated for Impairment | 2,716,376 |  |  | 2,722,867 |  |  |  |
Loans, net of deferred income | 2,732,452 | [1] |  | 2,744,042 | [2] |  |  |
Accrued interest included in recorded investment | 11,778 |  |  | 12,301 |  |  |  |
Loans Acquired With Deteriorated Credit Quality |  |  |  |  |  |  |  |
Allowance for Loan Losses: |  |  |  |  |  |  |  |
Acquired with Deteriorated Credit Quality | 362 |  |  | 8 |  |  |  |
Loans: |  |  |  |  |  |  |  |
Loans, net of deferred income | 10,029 |  |  | 11,556 |  |  |  |
Commercial and Industrial Loans and Leases |  |  |  |  |  |  |  |
Allowance for Loan Losses: |  |  |  |  |  |  |  |
Individually Evaluated for Impairment | 139 |  |  | 143 |  |  |  |
Collectively Evaluated for Impairment | 2,853 |  |  | 2,810 |  |  |  |
Total Ending Allowance Balance | 2,992 |  | 3,317 | 2,953 |  | 3,563 | 3,603 | 4,735
Loans: |  |  |  |  |  |  |  |
Loans Individually Evaluated for Impairment | 2,115 |  |  | 3,536 |  |  |  |
Loans Collectively Evaluated for Impairment | 552,938 |  |  | 540,768 |  |  |  |
Loans, net of deferred income | 555,935 | [1] |  | 545,342 | [2] |  |  |
Commercial and Industrial Loans and Leases | Loans Acquired With Deteriorated Credit Quality |  |  |  |  |  |  |  |
Allowance for Loan Losses: |  |  |  |  |  |  |  |
Acquired with Deteriorated Credit Quality | 0 |  |  | 0 |  |  |  |
Loans: |  |  |  |  |  |  |  |
Loans, net of deferred income | 882 |  |  | 1,038 |  |  |  |
Commercial Real Estate Loans |  |  |  |  |  |  |  |
Allowance for Loan Losses: |  |  |  |  |  |  |  |
Individually Evaluated for Impairment | 1,411 |  |  | 1,680 |  |  |  |
Collectively Evaluated for Impairment | 4,073 |  |  | 3,608 |  |  |  |
Total Ending Allowance Balance | 5,841 |  | 5,741 | 5,291 |  | 4,958 | 4,622 | 4,591
Loans: |  |  |  |  |  |  |  |
Loans Individually Evaluated for Impairment | 3,932 |  |  | 6,083 |  |  |  |
Loans Collectively Evaluated for Impairment | 1,207,345 |  |  | 1,198,806 |  |  |  |
Loans, net of deferred income | 1,216,906 | [1] |  | 1,211,882 | [2] |  |  |
Commercial Real Estate Loans | Loans Acquired With Deteriorated Credit Quality |  |  |  |  |  |  |  |
Allowance for Loan Losses: |  |  |  |  |  |  |  |
Acquired with Deteriorated Credit Quality | 357 |  |  | 3 |  |  |  |
Loans: |  |  |  |  |  |  |  |
Loans, net of deferred income | 5,629 |  |  | 6,993 |  |  |  |
Agricultural Loans |  |  |  |  |  |  |  |
Allowance for Loan Losses: |  |  |  |  |  |  |  |
Individually Evaluated for Impairment | 0 |  |  | 0 |  |  |  |
Collectively Evaluated for Impairment | 5,725 |  |  | 5,776 |  |  |  |
Total Ending Allowance Balance | 5,725 |  | 5,453 | 5,776 |  | 5,578 | 4,825 | 4,894
Loans: |  |  |  |  |  |  |  |
Loans Individually Evaluated for Impairment | 0 |  |  | 0 |  |  |  |
Loans Collectively Evaluated for Impairment | 367,030 |  |  | 368,817 |  |  |  |
Loans, net of deferred income | 368,912 | [1] |  | 370,694 | [2] |  |  |
Agricultural Loans | Loans Acquired With Deteriorated Credit Quality |  |  |  |  |  |  |  |
Allowance for Loan Losses: |  |  |  |  |  |  |  |
Acquired with Deteriorated Credit Quality | 0 |  |  | 0 |  |  |  |
Loans: |  |  |  |  |  |  |  |
Loans, net of deferred income | 1,882 |  |  | 1,877 |  |  |  |
Home Equity Loans |  |  |  |  |  |  |  |
Allowance for Loan Losses: |  |  |  |  |  |  |  |
Individually Evaluated for Impairment | 0 |  |  | 0 |  |  |  |
Collectively Evaluated for Impairment | 258 |  |  | 229 |  |  |  |
Total Ending Allowance Balance | 258 |  | 214 | 229 |  | 366 | 272 | 330
Loans: |  |  |  |  |  |  |  |
Loans Individually Evaluated for Impairment | 0 |  |  | 0 |  |  |  |
Loans Collectively Evaluated for Impairment | 203,982 |  |  | 208,644 |  |  |  |
Loans, net of deferred income | 204,350 | [1] |  | 209,009 | [2] |  |  |
Home Equity Loans | Loans Acquired With Deteriorated Credit Quality |  |  |  |  |  |  |  |
Allowance for Loan Losses: |  |  |  |  |  |  |  |
Acquired with Deteriorated Credit Quality | 0 |  |  | 0 |  |  |  |
Loans: |  |  |  |  |  |  |  |
Loans, net of deferred income | 368 |  |  | 365 |  |  |  |
Consumer Loans |  |  |  |  |  |  |  |
Allowance for Loan Losses: |  |  |  |  |  |  |  |
Individually Evaluated for Impairment | 0 |  |  | 0 |  |  |  |
Collectively Evaluated for Impairment | 422 |  |  | 420 |  |  |  |
Total Ending Allowance Balance | 422 |  | 483 | 420 |  | 347 | 316 | 298
Loans: |  |  |  |  |  |  |  |
Loans Individually Evaluated for Impairment | 0 |  |  | 0 |  |  |  |
Loans Collectively Evaluated for Impairment | 77,824 |  |  | 77,761 |  |  |  |
Loans, net of deferred income | 77,824 | [1] |  | 77,761 | [2] |  |  |
Consumer Loans | Loans Acquired With Deteriorated Credit Quality |  |  |  |  |  |  |  |
Allowance for Loan Losses: |  |  |  |  |  |  |  |
Acquired with Deteriorated Credit Quality | 0 |  |  | 0 |  |  |  |
Loans: |  |  |  |  |  |  |  |
Loans, net of deferred income | 0 |  |  | 0 |  |  |  |
Residential Mortgage Loans |  |  |  |  |  |  |  |
Allowance for Loan Losses: |  |  |  |  |  |  |  |
Individually Evaluated for Impairment | 0 |  |  | 0 |  |  |  |
Collectively Evaluated for Impairment | 344 |  |  | 467 |  |  |  |
Total Ending Allowance Balance | 349 |  | 429 | 472 |  | 366 | 327 | 343
Loans: |  |  |  |  |  |  |  |
Loans Individually Evaluated for Impairment | 0 |  |  | 0 |  |  |  |
Loans Collectively Evaluated for Impairment | 307,257 |  |  | 328,071 |  |  |  |
Loans, net of deferred income | 308,525 | [1] |  | 329,354 | [2] |  |  |
Residential Mortgage Loans | Loans Acquired With Deteriorated Credit Quality |  |  |  |  |  |  |  |
Allowance for Loan Losses: |  |  |  |  |  |  |  |
Acquired with Deteriorated Credit Quality | 5 |  |  | 5 |  |  |  |
Loans: |  |  |  |  |  |  |  |
Loans, net of deferred income | 1,268 |  |  | 1,283 |  |  |  |
Unallocated |  |  |  |  |  |  |  |
Allowance for Loan Losses: |  |  |  |  |  |  |  |
Individually Evaluated for Impairment | 0 |  |  | 0 |  |  |  |
Collectively Evaluated for Impairment | 652 |  |  | 682 |  |  |  |
Total Ending Allowance Balance | 652 |  | $ 606 | 682 |  | $ 459 | $ 495 | $ 503
Unallocated | Loans Acquired With Deteriorated Credit Quality |  |  |  |  |  |  |  |
Allowance for Loan Losses: |  |  |  |  |  |  |  |
Acquired with Deteriorated Credit Quality | $ 0 |  |  | $ 0 |  |  |  |
[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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