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Loans Receivable and Allowance for Loan Losses (Loan Portfolio Summarized by the Past Due Status) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Past Due | $ 1,360,467 | $ 1,397,574
Non-Accrual | 2,722 | 3,391
Total Past Due and Non-Accrual | 3,826 | 5,434
Total Loans | 1,372,774 | 1,412,289
Purchased Credit-Impaired [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Non-Accrual | 8,481 | 9,281
Total Loans | 1,372,774 | 1,412,289
Financing Receivables, 31 to 60 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 913 | 1,656
Financing Receivables, 61 to 90 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 191 | 387
Residential Real Estate Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 264,251 | 261,406
Non-Accrual | 522 | 571
Total Past Due and Non-Accrual | 740 | 1,130
Total Loans | 265,778 | 263,127
Residential Real Estate Loans [Member] | Purchased Credit-Impaired [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Non-Accrual | 787 | 591
Total Loans | 265,778 | 263,127
Residential Real Estate Loans [Member] | Financing Receivables, 31 to 60 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 186 | 355
Residential Real Estate Loans [Member] | Financing Receivables, 61 to 90 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 32 | 204
Commercial Real Estate Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 609,048 | 573,376
Non-Accrual | 39 | 1,674
Total Past Due and Non-Accrual | 341 | 1,733
Total Loans | 612,794 | 579,104
Commercial Real Estate Loans [Member] | Purchased Credit-Impaired [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Non-Accrual | 3,405 | 3,995
Total Loans | 611,935 | 579,104
Commercial Real Estate Loans [Member] | Financing Receivables, 31 to 60 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 244 | 59
Commercial Real Estate Loans [Member] | Financing Receivables, 61 to 90 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 58 |
Agricultural Real Estate Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 61,201 | 63,615
Non-Accrual | 858 | 676
Total Past Due and Non-Accrual | 858 | 676
Total Loans | 64,018 | 66,334
Agricultural Real Estate Loans [Member] | Purchased Credit-Impaired [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Non-Accrual | 1,959 | 2,043
Total Loans | 64,876 | 66,334
Construction Real Estate Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 23,831 | 20,811
Total Past Due and Non-Accrual | 61 |
Total Loans | 23,892 | 21,005
Construction Real Estate Loans [Member] | Purchased Credit-Impaired [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Non-Accrual |  | 194
Total Loans | 23,892 | 21,005
Construction Real Estate Loans [Member] | Financing Receivables, 31 to 60 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 61 |
Commercial [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 215,349 | 282,374
Non-Accrual | 1,077 | 22
Total Past Due and Non-Accrual | 1,215 | 1,121
Total Loans | 216,692 | 283,741
Commercial [Member] | Purchased Credit-Impaired [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Non-Accrual | 128 | 246
Total Loans | 216,567 | 283,741
Commercial [Member] | Financing Receivables, 31 to 60 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 112 | 1,009
Commercial [Member] | Financing Receivables, 61 to 90 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 26 | 90
Other Agricultural Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 37,929 | 38,454
Non-Accrual | 126 | 263
Total Past Due and Non-Accrual | 126 | 263
Total Loans | 40,257 | 40,929
Other Agricultural Loans [Member] | Purchased Credit-Impaired [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Non-Accrual | 2,202 | 2,212
Total Loans | 40,383 | 40,929
Consumer Loans To Individuals [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 148,858 | 157,538
Non-Accrual | 100 | 185
Total Past Due and Non-Accrual | 485 | 511
Total Loans | 149,343 | 158,049
Consumer Loans To Individuals [Member] | Purchased Credit-Impaired [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans | 149,343 | 158,049
Consumer Loans To Individuals [Member] | Financing Receivables, 31 to 60 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 310 | 233
Consumer Loans To Individuals [Member] | Financing Receivables, 61 to 90 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | $ 75 | $ 93

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