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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 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Mar. 31, 2022
Dec. 31, 2021
Mar. 31, 2021
Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Roll Forward]                
Financing Receivable, Allowance for Credit Loss $ 149,935 $ 142,988 $ 149,935 $ 142,988 $ 146,949 $ 155,578 $ 148,294 $ 149,140
Financing Receivable, Allowance for Credit Loss, Writeoff (636) (1,940) (2,537) (5,406)        
Financing Receivable, Allowance for Credit Loss, Recovery 1,522 2,134 2,594 5,554        
Provision (recapture) for credit losses 2,100 (5,500) (5,700) (6,300)        
Commercial Real Estate [Member]                
Financing Receivable, Allowance for Credit Loss [Roll Forward]                
Financing Receivable, Allowance for Credit Loss 57,119 53,250 57,119 53,250 57,307 61,254 57,050 68,934
Financing Receivable, Allowance for Credit Loss, Writeoff (299) (316) (299) (316)        
Financing Receivable, Allowance for Credit Loss, Recovery 147 16 161 52        
Provision (recapture) for credit losses (36) (3,500) (3,997) (15,420)        
Commercial Business [Member]                
Financing Receivable, Allowance for Credit Loss [Roll Forward]                
Financing Receivable, Allowance for Credit Loss 51,985 57,554 51,985 57,554 50,474 54,712 58,405 45,250
Financing Receivable, Allowance for Credit Loss, Writeoff (92) (971) (1,724) (4,310)        
Financing Receivable, Allowance for Credit Loss, Recovery 797 874 1,088 4,088        
Provision (recapture) for credit losses 806 (754) (2,091) 12,526        
Agriculture [Member]                
Financing Receivable, Allowance for Credit Loss [Roll Forward]                
Financing Receivable, Allowance for Credit Loss 8,895 7,920 8,895 7,920 8,010 8,148 9,487 9,052
Financing Receivable, Allowance for Credit Loss, Writeoff (1) (122) (24) (122)        
Financing Receivable, Allowance for Credit Loss, Recovery 24 5 149 17        
Provision (recapture) for credit losses 862 (1,450) 622 (1,027)        
Construction [Member]                
Financing Receivable, Allowance for Credit Loss [Roll Forward]                
Financing Receivable, Allowance for Credit Loss 5,914 6,559 5,914 6,559 5,399 5,397 6,551 7,636
Financing Receivable, Allowance for Credit Loss, Writeoff 0 0 0 0        
Financing Receivable, Allowance for Credit Loss, Recovery 136 521 144 567        
Provision (recapture) for credit losses 379 (513) 373 (1,644)        
One-to-Four Family Residential [Member]                
Financing Receivable, Allowance for Credit Loss [Roll Forward]                
Financing Receivable, Allowance for Credit Loss 24,626 16,519 24,626 16,519 24,356 24,123 15,638 16,875
Financing Receivable, Allowance for Credit Loss, Writeoff (3) (146) (3) (146)        
Financing Receivable, Allowance for Credit Loss, Recovery 291 503 585 554        
Provision (recapture) for credit losses (18) 524 (79) (764)        
Consumer Loan [Member]                
Financing Receivable, Allowance for Credit Loss [Roll Forward]                
Financing Receivable, Allowance for Credit Loss 1,396 1,186 1,396 1,186 $ 1,403 $ 1,944 $ 1,163 $ 1,393
Financing Receivable, Allowance for Credit Loss, Writeoff (241) (385) (487) (512)        
Financing Receivable, Allowance for Credit Loss, Recovery 127 215 467 276        
Provision (recapture) for credit losses $ 107 $ 193 $ (528) $ 29