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Loans - Risk Category of Loans by Portfolio Class (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs $ 1,218,999 $ 846,374
Agricultural Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 198,859 68,588
Agricultural [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 111,949 108,616
Commercial Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 550,082 419,131
Commercial and Industrial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 135,695 121,863
Industrial Development Bonds [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 8,314 5,889
1-2 [Member] | Agricultural Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 14,655 4,442
1-2 [Member] | Agricultural [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 4,093 5,753
1-2 [Member] | Commercial Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 7,860 4,698
1-2 [Member] | Commercial and Industrial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 3,844 3,199
3 [Member] | Agricultural Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 33,951 14,118
3 [Member] | Agricultural [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 36,913 38,852
3 [Member] | Commercial Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 131,780 64,341
3 [Member] | Commercial and Industrial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 19,790 16,284
3 [Member] | Industrial Development Bonds [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 3,168 3,135
4 [Member] | Agricultural Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 116,834 49,596
4 [Member] | Agricultural [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 65,414 63,380
4 [Member] | Commercial Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 401,404 346,072
4 [Member] | Commercial and Industrial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 103,527 100,644
4 [Member] | Industrial Development Bonds [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 5,146 2,754
5 [Member] | Agricultural Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 14,836 422
5 [Member] | Agricultural [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 2,300 631
5 [Member] | Commercial Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 3,699 2,171
5 [Member] | Commercial and Industrial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 2,465 308
6 [Member] | Agricultural Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 18,583 10
6 [Member] | Agricultural [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 3,229  
6 [Member] | Commercial Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 5,339 1,849
6 [Member] | Commercial and Industrial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 4,983 542
7 [Member] | Commercial and Industrial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs $ 1,086 $ 886