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Loans Receivable and the Allowance for Credit Losses - PCD Loans (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Mar. 31, 2020
Financing Receivable, Allowance for Credit Loss [Line Items]    
Loans receivable, net $ 3,422,187 $ 3,374,575
Carrying amount 22,551  
Allowance for credit losses 1,250  
Carrying amount, net of allowance for credit losses 21,301  
Agricultural    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Loans receivable, net   145,435
Commercial and industrial    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Loans receivable, net   864,702
Consumer    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Loans receivable, net   $ 80,889
Purchased credit impaired loans    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Loans receivable, net 23,047  
Purchased credit impaired loans | Agricultural    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Loans receivable, net 904  
Purchased credit impaired loans | Commercial and industrial    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Loans receivable, net 147  
Purchased credit impaired loans | Commercial real estate    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Loans receivable, net 17,803  
Purchased credit impaired loans | Residential real estate    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Loans receivable, net 4,136  
Purchased credit impaired loans | Consumer    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Loans receivable, net $ 57