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Allowance for Loan and Lease Losses - Summary of Allowance for Loan Losses by Type (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Allowance for loan and lease losses            
Individually evaluated for impairment $ 25,908   $ 20,347      
Collectively evaluated for impairment 109,389   49,862      
Total allowance 135,950 $ 72,781 70,774 $ 68,003 $ 66,193 $ 64,540
Financing Receivables            
Individually evaluated for impairment 585,063   433,991      
Collectively evaluated for impairment 8,133,687   8,263,022      
Loans Outstanding 8,772,155   8,752,832      
Receivables acquired with deteriorated credit quality            
Allowance for loan and lease losses            
ASC 310-30 loans 653   565      
Total allowance 700   600      
Financing Receivables            
ASC 310-30 loans 53,405   55,819      
Commercial real estate            
Allowance for loan and lease losses            
Individually evaluated for impairment 7,020   4,159      
Collectively evaluated for impairment 57,285   12,509      
Total allowance 64,414 17,462 16,827 15,603 16,348 16,777
Financing Receivables            
Individually evaluated for impairment 132,679   54,275      
Collectively evaluated for impairment 4,486,167   4,418,611      
Loans Outstanding 4,640,457   4,495,010      
Commercial real estate | Receivables acquired with deteriorated credit quality            
Allowance for loan and lease losses            
ASC 310-30 loans 109   159      
Financing Receivables            
ASC 310-30 loans 21,611   22,124      
Agriculture            
Allowance for loan and lease losses            
Individually evaluated for impairment 8,136   8,234      
Collectively evaluated for impairment 21,390   22,320      
Total allowance 29,526 32,029 30,819 33,725 31,785 28,121
Financing Receivables            
Individually evaluated for impairment 347,879   329,479      
Collectively evaluated for impairment 1,365,625   1,501,164      
Loans Outstanding 1,716,474   1,833,399      
Agriculture | Receivables acquired with deteriorated credit quality            
Allowance for loan and lease losses            
ASC 310-30 loans 0   265      
Financing Receivables            
ASC 310-30 loans 2,970   2,756      
Commercial non-real estate            
Allowance for loan and lease losses            
Individually evaluated for impairment 8,601   6,062      
Collectively evaluated for impairment 23,136   11,476      
Total allowance 31,766 17,389 17,567 13,049 12,093 13,610
Financing Receivables            
Individually evaluated for impairment 93,477   42,910      
Collectively evaluated for impairment 1,415,903   1,480,949      
Loans Outstanding 1,509,558   1,524,080      
Commercial non-real estate | Receivables acquired with deteriorated credit quality            
Allowance for loan and lease losses            
ASC 310-30 loans 29   29      
Financing Receivables            
ASC 310-30 loans 178   221      
Residential real estate            
Allowance for loan and lease losses            
Individually evaluated for impairment 2,115   1,795      
Collectively evaluated for impairment 5,747   2,188      
Total allowance 8,356 4,620 4,095 4,326 4,611 4,749
Financing Receivables            
Individually evaluated for impairment 10,901   7,119      
Collectively evaluated for impairment 774,083   763,645      
Loans Outstanding 813,247   801,044      
Residential real estate | Receivables acquired with deteriorated credit quality            
Allowance for loan and lease losses            
ASC 310-30 loans 494   112      
Financing Receivables            
ASC 310-30 loans 28,263   30,280      
Consumer            
Allowance for loan and lease losses            
Individually evaluated for impairment 36   97      
Collectively evaluated for impairment 720   330      
Total allowance 777 288 427 374 430 257
Financing Receivables            
Individually evaluated for impairment 127   208      
Collectively evaluated for impairment 52,001   51,112      
Loans Outstanding 52,511   51,758      
Consumer | Receivables acquired with deteriorated credit quality            
Allowance for loan and lease losses            
ASC 310-30 loans 21   0      
Financing Receivables            
ASC 310-30 loans 383   438      
Other            
Allowance for loan and lease losses            
Individually evaluated for impairment 0   0      
Collectively evaluated for impairment 1,111   1,039      
Total allowance 1,111 $ 993 1,039 $ 926 $ 926 $ 1,026
Financing Receivables            
Individually evaluated for impairment 0   0      
Collectively evaluated for impairment 39,908   47,541      
Loans Outstanding 39,908   47,541      
Other | Receivables acquired with deteriorated credit quality            
Allowance for loan and lease losses            
ASC 310-30 loans 0   0      
Financing Receivables            
ASC 310-30 loans $ 0   $ 0