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Loans Receivable and Allowance for Loan Losses (Loan Portfolio Summarized by the Past Due Status) (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Current | $ 1,408,933 | $ 1,397,574
Non-Accrual | 3,198 | 3,391
Total Past Due and Non-Accrual | 6,230 | 5,434
Total Loans | 1,424,328 | 1,412,289
Purchased Credit-Impaired [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Non-Accrual | 9,165 | 9,281
Total Loans | 1,424,328 | 1,412,289
Financing Receivables, 31 to 60 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 2,889 | 1,656
Financing Receivables, 61 to 90 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 143 | 387
Residential Real Estate Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 259,978 | 261,406
Non-Accrual | 417 | 571
Total Past Due and Non-Accrual | 890 | 1,130
Total Loans | 261,450 | 263,127
Residential Real Estate Loans [Member] | Purchased Credit-Impaired [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Non-Accrual | 582 | 591
Total Loans | 261,450 | 263,127
Residential Real Estate Loans [Member] | Financing Receivables, 31 to 60 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 413 | 355
Residential Real Estate Loans [Member] | Financing Receivables, 61 to 90 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 60 | 204
Commercial Real Estate Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 575,207 | 573,376
Non-Accrual | 1,638 | 1,674
Total Past Due and Non-Accrual | 2,156 | 1,733
Total Loans | 581,329 | 579,104
Commercial Real Estate Loans [Member] | Purchased Credit-Impaired [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Non-Accrual | 3,966 | 3,995
Total Loans | 581,329 | 579,104
Commercial Real Estate Loans [Member] | Financing Receivables, 31 to 60 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 518 | 59
Agricultural Real Estate Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 62,176 | 63,615
Non-Accrual | 676 | 676
Total Past Due and Non-Accrual | 772 | 676
Total Loans | 64,954 | 66,334
Agricultural Real Estate Loans [Member] | Purchased Credit-Impaired [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Non-Accrual | 2,006 | 2,043
Total Loans | 64,954 | 66,334
Agricultural Real Estate Loans [Member] | Financing Receivables, 31 to 60 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 96 |
Construction Real Estate Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 20,039 | 20,811
Total Loans | 20,237 | 21,005
Construction Real Estate Loans [Member] | Purchased Credit-Impaired [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Non-Accrual | 198 | 194
Total Loans | 20,237 | 21,005
Commercial [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 300,486 | 282,374
Non-Accrual | 38 | 22
Total Past Due and Non-Accrual | 1,705 | 1,121
Total Loans | 302,431 | 283,741
Commercial [Member] | Purchased Credit-Impaired [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Non-Accrual | 240 | 246
Total Loans | 302,431 | 283,741
Commercial [Member] | Financing Receivables, 31 to 60 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 1,667 | 1,009
Commercial [Member] | Financing Receivables, 61 to 90 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due |  | 90
Other Agricultural Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 37,587 | 38,454
Non-Accrual | 308 | 263
Total Past Due and Non-Accrual | 362 | 263
Total Loans | 40,122 | 40,929
Other Agricultural Loans [Member] | Purchased Credit-Impaired [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Non-Accrual | 2,173 | 2,212
Total Loans | 40,122 | 40,929
Other Agricultural Loans [Member] | Financing Receivables, 31 to 60 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 54 |
Consumer Loans To Individuals [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 153,460 | 157,538
Non-Accrual | 121 | 185
Total Past Due and Non-Accrual | 345 | 511
Total Loans | 153,805 | 158,049
Consumer Loans To Individuals [Member] | Purchased Credit-Impaired [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans | 153,805 | 158,049
Consumer Loans To Individuals [Member] | Financing Receivables, 31 to 60 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 141 | 233
Consumer Loans To Individuals [Member] | Financing Receivables, 61 to 90 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | $ 83 | $ 93

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