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Loans (Recorded Investment of Risk Category of Loans by Class) (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Jan. 01, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total | $ 3,270,934 |  | $ 3,081,973
Commercial Real Estate Loans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total | 1,473,234 | $ 1,500,247 | 1,495,862
Agricultural Loans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total | 373,483 | $ 384,654 | 384,526
Pass |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total |  |  | 2,336,007
Pass | Acquired with Deteriorated Credit Quality |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total |  |  | 68
Pass | Acquired with Deteriorated Credit Quality | Loans Acquired In Current Year |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total |  |  | 254,629
Pass | Commercial and Industrial Loans and Leases |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total |  |  | 556,706
Pass | Commercial Real Estate Loans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total | 1,427,122 |  | 1,453,310
Pass | Agricultural Loans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total | 303,249 |  | 325,991
Special Mention |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total |  |  | 99,228
Special Mention | Acquired with Deteriorated Credit Quality |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total |  |  | 613
Special Mention | Acquired with Deteriorated Credit Quality | Loans Acquired In Current Year |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total |  |  | 16,535
Special Mention | Commercial and Industrial Loans and Leases |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total |  |  | 19,671
Special Mention | Commercial Real Estate Loans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total | 31,670 |  | 30,504
Special Mention | Agricultural Loans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total | 56,843 |  | 49,053
Substandard |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total |  |  | 46,903
Substandard | Acquired with Deteriorated Credit Quality |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total |  |  | 11,060
Substandard | Acquired with Deteriorated Credit Quality | Loans Acquired In Current Year |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total |  |  | 12,769
Substandard | Commercial and Industrial Loans and Leases |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total |  |  | 15,026
Substandard | Commercial Real Estate Loans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total | 14,442 |  | 16,050
Substandard | Agricultural Loans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total | 13,391 |  | 15,827
Doubtful |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total |  |  | 0
Doubtful | Acquired with Deteriorated Credit Quality |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total |  |  | 0
Doubtful | Acquired with Deteriorated Credit Quality | Loans Acquired In Current Year |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total |  |  | 0
Doubtful | Commercial and Industrial Loans and Leases |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total |  |  | 0
Doubtful | Commercial Real Estate Loans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total | 0 |  | 0
Doubtful | Agricultural Loans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total | $ 0 |  | 0
Total |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total |  |  | 2,482,138
Total | Acquired with Deteriorated Credit Quality |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total |  |  | 11,741
Total | Acquired with Deteriorated Credit Quality | Loans Acquired In Current Year |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total |  |  | 283,933
Total | Commercial and Industrial Loans and Leases |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total |  |  | 591,403
Total | Commercial Real Estate Loans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total |  |  | 1,499,864
Total | Agricultural Loans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total |  |  | $ 390,871

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