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Loans - Risk Category of Loans by Portfolio Class (Detail) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs $ 1,857,419 $ 1,302,990
Agricultural Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 198,033 188,826
Agricultural [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 118,504 94,490
Commercial Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 847,110 587,654
Commercial and Industrial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 208,049 188,286
Other Loan [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 32,089 15,757
1-2 [Member] | Agricultural Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 8,720 11,960
1-2 [Member] | Agricultural [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 4,178 5,093
1-2 [Member] | Commercial Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 10,894 11,001
1-2 [Member] | Commercial and Industrial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 4,604 38,486
3 [Member] | Agricultural Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 42,180 38,306
3 [Member] | Agricultural [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 38,623 23,779
3 [Member] | Commercial Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 238,132 165,201
3 [Member] | Commercial and Industrial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 46,547 26,515
3 [Member] | Other Loan [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 11,408 4,651
4 [Member] | Agricultural Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 129,301 112,465
4 [Member] | Agricultural [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 75,164 63,480
4 [Member] | Commercial Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 568,038 396,076
4 [Member] | Commercial and Industrial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 152,736 114,108
4 [Member] | Other Loan [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 20,681 11,106
5 [Member] | Agricultural Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 4,599 7,478
5 [Member] | Agricultural [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 227 1,577
5 [Member] | Commercial Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 14,509 4,010
5 [Member] | Commercial and Industrial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 986 3,266
6 [Member] | Agricultural Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 13,233 18,617
6 [Member] | Agricultural [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 312 561
6 [Member] | Commercial Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 15,537 11,366
6 [Member] | Commercial and Industrial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs $ 3,176 4,796
7 [Member] | Commercial and Industrial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs   $ 1,115