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Loans - Contractual Maturity Schedule by Major Category of Loans Excluding Fair Value Adjustments (Detail) $ in Thousands | Dec. 31, 2019 USD ($)
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Accounts, Notes, Loans and Financing Receivable [Line Items] |
Loans excluding fair value adjustments | $ 1,221,966
Consumer Real Estate [Member] |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Loans excluding fair value adjustments | 165,419
Agricultural Real Estate [Member] |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Loans excluding fair value adjustments | 200,102
Agricultural [Member] |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Loans excluding fair value adjustments | 111,811
Commercial Real Estate [Member] |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Loans excluding fair value adjustments | 551,491
Commercial and Industrial [Member] |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Loans excluding fair value adjustments | 135,683
Consumer [Member] |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Loans excluding fair value adjustments | 49,153
Other Loan [Member] |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Loans excluding fair value adjustments | 8,307
Major Category Of Receivables Due Within One Year [Member] |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Loans excluding fair value adjustments | 197,074
Major Category Of Receivables Due Within One Year [Member] | Consumer Real Estate [Member] |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Loans excluding fair value adjustments | 5,163
Major Category Of Receivables Due Within One Year [Member] | Agricultural Real Estate [Member] |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Loans excluding fair value adjustments | 272
Major Category Of Receivables Due Within One Year [Member] | Agricultural [Member] |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Loans excluding fair value adjustments | 66,851
Major Category Of Receivables Due Within One Year [Member] | Commercial Real Estate [Member] |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Loans excluding fair value adjustments | 49,976
Major Category Of Receivables Due Within One Year [Member] | Commercial and Industrial [Member] |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Loans excluding fair value adjustments | 68,257
Major Category Of Receivables Due Within One Year [Member] | Consumer [Member] |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Loans excluding fair value adjustments | 6,215
Major Category Of Receivables Due Within One Year [Member] | Other Loan [Member] |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Loans excluding fair value adjustments | 340
Major Category Of Receivables Due Within One Year to Five Years [Member] |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Loans excluding fair value adjustments | 372,697
Major Category Of Receivables Due Within One Year to Five Years [Member] | Consumer Real Estate [Member] |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Loans excluding fair value adjustments | 19,025
Major Category Of Receivables Due Within One Year to Five Years [Member] | Agricultural Real Estate [Member] |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Loans excluding fair value adjustments | 4,668
Major Category Of Receivables Due Within One Year to Five Years [Member] | Agricultural [Member] |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Loans excluding fair value adjustments | 29,954
Major Category Of Receivables Due Within One Year to Five Years [Member] | Commercial Real Estate [Member] |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Loans excluding fair value adjustments | 230,817
Major Category Of Receivables Due Within One Year to Five Years [Member] | Commercial and Industrial [Member] |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Loans excluding fair value adjustments | 54,718
Major Category Of Receivables Due Within One Year to Five Years [Member] | Consumer [Member] |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Loans excluding fair value adjustments | 32,711
Major Category Of Receivables Due Within One Year to Five Years [Member] | Other Loan [Member] |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Loans excluding fair value adjustments | 804
Major Category Of Receivables Over Five Years [Member] |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Loans excluding fair value adjustments | 652,195
Major Category Of Receivables Over Five Years [Member] | Consumer Real Estate [Member] |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Loans excluding fair value adjustments | 141,231
Major Category Of Receivables Over Five Years [Member] | Agricultural Real Estate [Member] |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Loans excluding fair value adjustments | 195,162
Major Category Of Receivables Over Five Years [Member] | Agricultural [Member] |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Loans excluding fair value adjustments | 15,006
Major Category Of Receivables Over Five Years [Member] | Commercial Real Estate [Member] |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Loans excluding fair value adjustments | 270,698
Major Category Of Receivables Over Five Years [Member] | Commercial and Industrial [Member] |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Loans excluding fair value adjustments | 12,708
Major Category Of Receivables Over Five Years [Member] | Consumer [Member] |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Loans excluding fair value adjustments | 10,227
Major Category Of Receivables Over Five Years [Member] | Other Loan [Member] |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Loans excluding fair value adjustments | $ 7,163

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