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Allowance for Credit Losses and Allowance for Unfunded Commitments and Letters of Credit (Allowance for Credit Losses) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Financing Receivable, Allowance for Credit Loss $ 148,294 $ 122,074 $ 149,140   $ 83,968
Financing Receivable, Allowance for Credit Loss, Writeoff (3,466) (6,789)      
Financing Receivable, Allowance for Credit Loss, Recovery 3,420 1,763      
Provision (recapture) for credit losses (800) 41,500      
Commercial Real Estate [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Financing Receivable, Allowance for Credit Loss 57,050 37,122 68,934   20,340
Financing Receivable, Allowance for Credit Loss, Writeoff 0 (101)      
Financing Receivable, Allowance for Credit Loss, Recovery 36 14      
Provision (recapture) for credit losses (11,920) 9,336      
Commercial Business [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Financing Receivable, Allowance for Credit Loss 58,405 45,570 45,250   30,292
Financing Receivable, Allowance for Credit Loss, Writeoff (3,339) (1,684)      
Financing Receivable, Allowance for Credit Loss, Recovery 3,214 860      
Provision (recapture) for credit losses 13,280 15,340      
Agriculture [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Financing Receivable, Allowance for Credit Loss 9,487 11,085 9,052   15,835
Financing Receivable, Allowance for Credit Loss, Writeoff 0 (4,726)      
Financing Receivable, Allowance for Credit Loss, Recovery 12 41      
Provision (recapture) for credit losses 423 9,260      
Construction [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Financing Receivable, Allowance for Credit Loss 6,551 8,845 7,636   8,571
Financing Receivable, Allowance for Credit Loss, Writeoff 0 0      
Financing Receivable, Allowance for Credit Loss, Recovery 46 442      
Provision (recapture) for credit losses (1,131) 1,582      
One-to-Four Family Residential [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Financing Receivable, Allowance for Credit Loss 15,638 17,659 16,875   7,435
Financing Receivable, Allowance for Credit Loss, Writeoff 0 (10)      
Financing Receivable, Allowance for Credit Loss, Recovery 51 282      
Provision (recapture) for credit losses (1,288) 5,715      
Consumer Loan [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Financing Receivable, Allowance for Credit Loss 1,163 1,644 $ 1,393   883
Financing Receivable, Allowance for Credit Loss, Writeoff (127) (268)      
Financing Receivable, Allowance for Credit Loss, Recovery 61 124      
Provision (recapture) for credit losses $ (164) 127      
Unallocated Financing Receivables [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Financing Receivable, Allowance for Credit Loss   149     $ 612
Financing Receivable, Allowance for Credit Loss, Writeoff   0      
Financing Receivable, Allowance for Credit Loss, Recovery   0      
Provision (recapture) for credit losses   $ 140      
Accounting Standards Update 2016-13 [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Change in allowance for credit losses due to adoption of new ASU       $ 1,632  
Accounting Standards Update 2016-13 [Member] | Commercial Real Estate [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Change in allowance for credit losses due to adoption of new ASU       7,533  
Accounting Standards Update 2016-13 [Member] | Commercial Business [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Change in allowance for credit losses due to adoption of new ASU       762  
Accounting Standards Update 2016-13 [Member] | Agriculture [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Change in allowance for credit losses due to adoption of new ASU       (9,325)  
Accounting Standards Update 2016-13 [Member] | Construction [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Change in allowance for credit losses due to adoption of new ASU       (1,750)  
Accounting Standards Update 2016-13 [Member] | One-to-Four Family Residential [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Change in allowance for credit losses due to adoption of new ASU       4,237  
Accounting Standards Update 2016-13 [Member] | Consumer Loan [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Change in allowance for credit losses due to adoption of new ASU       778  
Accounting Standards Update 2016-13 [Member] | Unallocated Financing Receivables [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Change in allowance for credit losses due to adoption of new ASU       $ (603)