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Loans and Allowance for Credit Losses - Impaired Loans, Segregated by Class of Loans (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Financing Receivable Impaired [Line Items]      
With no related allowance recorded, Unpaid Principal Balance $ 4,550   $ 23,370
With no related allowance recorded, Recorded Investment 4,481   8,088
With an allowance recorded, Unpaid Principal Balance 63,621   44,500
With an allowance recorded, Recorded Investment 53,025   35,601
Allowance for Loan Losses Allocated 21,258   10,499
Unpaid Principal Balance 68,171   67,870
Recorded Investment 57,506   43,689
With an allowance recorded, Average Recorded Investment 44,312 $ 15,548  
With an allowance recorded, Interest Income Recognized 252 1  
With no related allowance recorded, Average Recorded Investment 6,286 21,162  
With no related allowance recorded, Interest Income Recognized 5 28  
Average Recorded Investment 50,598 36,710  
Interest Income Recognized 257 29  
Commercial Real Estate [Member]      
Financing Receivable Impaired [Line Items]      
With no related allowance recorded, Unpaid Principal Balance     6,279
With no related allowance recorded, Recorded Investment     1,683
With an allowance recorded, Unpaid Principal Balance 8,563   7,134
With an allowance recorded, Recorded Investment 7,978   5,899
Allowance for Loan Losses Allocated 3,967   2,540
With an allowance recorded, Average Recorded Investment 6,938 5,010  
With an allowance recorded, Interest Income Recognized 15    
With no related allowance recorded, Average Recorded Investment 842 1,094  
With no related allowance recorded, Interest Income Recognized 1    
Commercial and Industrial [Member]      
Financing Receivable Impaired [Line Items]      
With no related allowance recorded, Unpaid Principal Balance 24   2,087
With no related allowance recorded, Recorded Investment     643
With an allowance recorded, Unpaid Principal Balance 35,354   29,245
With an allowance recorded, Recorded Investment 28,559   22,814
Allowance for Loan Losses Allocated 10,911   6,471
With an allowance recorded, Average Recorded Investment 25,687 3,531  
With an allowance recorded, Interest Income Recognized 108    
With no related allowance recorded, Average Recorded Investment 321 14,601  
With no related allowance recorded, Interest Income Recognized 4 23  
Residential Real Estate [Member]      
Financing Receivable Impaired [Line Items]      
With no related allowance recorded, Unpaid Principal Balance 58   270
With no related allowance recorded, Recorded Investment 21   180
With an allowance recorded, Unpaid Principal Balance 2,961   3,023
With an allowance recorded, Recorded Investment 2,858   2,775
Allowance for Loan Losses Allocated 715   610
With an allowance recorded, Average Recorded Investment 2,816 3,560  
With an allowance recorded, Interest Income Recognized   1  
With no related allowance recorded, Average Recorded Investment 101 4,336  
Agricultural Real Estate [Member]      
Financing Receivable Impaired [Line Items]      
With no related allowance recorded, Unpaid Principal Balance 2,097   3,408
With no related allowance recorded, Recorded Investment 2,097   1,090
With an allowance recorded, Unpaid Principal Balance 5,866   3,474
With an allowance recorded, Recorded Investment 5,361   3,021
Allowance for Loan Losses Allocated 1,477   638
With an allowance recorded, Average Recorded Investment 4,191 1,713  
With an allowance recorded, Interest Income Recognized 95    
With no related allowance recorded, Average Recorded Investment 1,594 1,131  
With no related allowance recorded, Interest Income Recognized   5  
Consumer [Member]      
Financing Receivable Impaired [Line Items]      
With an allowance recorded, Unpaid Principal Balance 305   294
With an allowance recorded, Recorded Investment 276   272
Allowance for Loan Losses Allocated 69   68
With an allowance recorded, Average Recorded Investment 274 366  
Agricultural [Member]      
Financing Receivable Impaired [Line Items]      
With no related allowance recorded, Unpaid Principal Balance 2,371   11,326
With no related allowance recorded, Recorded Investment 2,363   4,492
With an allowance recorded, Unpaid Principal Balance 10,572   1,330
With an allowance recorded, Recorded Investment 7,993   820
Allowance for Loan Losses Allocated 4,119   $ 172
With an allowance recorded, Average Recorded Investment 4,406 $ 1,368  
With an allowance recorded, Interest Income Recognized 34    
With no related allowance recorded, Average Recorded Investment $ 3,428