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Loans (Allowance for Credit Losses on Financing Receivables) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Allowance For Loan Losses        
Ending Balance Under ASC 310-10-35 $ 8,172 $ 7,554    
Ending Balance Under ASC 450-20 62,223 54,409    
Total 70,395 61,963 $ 55,686 $ 54,324
Gross Loans Receivable Held to Maturity        
Ending Balance Evaluated for Impairment Under ASC 310-10-35 87,052 81,796    
Ending Balance Evaluated for Impairment Under ASC 450-20 8,286,445 7,329,085    
Total 8,373,497 7,410,881    
Commercial        
Gross Loans Receivable Held to Maturity        
Total 6,790,458 5,731,712    
Commercial | Commercial        
Allowance For Loan Losses        
Ending Balance Under ASC 310-10-35 6,245 5,733    
Ending Balance Under ASC 450-20 21,499 18,772    
Total 27,744 24,505 18,098  
Gross Loans Receivable Held to Maturity        
Ending Balance Evaluated for Impairment Under ASC 310-10-35 24,438 24,202    
Ending Balance Evaluated for Impairment Under ASC 450-20 2,395,471 1,996,029    
Total 2,419,909 2,020,231    
Commercial | Commercial real estate        
Allowance For Loan Losses        
Ending Balance Under ASC 310-10-35 451 218    
Ending Balance Under ASC 450-20 30,292 25,320    
Total 30,743 25,538 21,950  
Gross Loans Receivable Held to Maturity        
Ending Balance Evaluated for Impairment Under ASC 310-10-35 18,652 14,388    
Ending Balance Evaluated for Impairment Under ASC 450-20 4,351,897 3,697,093    
Total 4,370,549 3,711,481    
Agricultural and agricultural real estate        
Allowance For Loan Losses        
Ending Balance Under ASC 310-10-35 916 686    
Ending Balance Under ASC 450-20 4,701 4,267    
Total 5,617 4,953 4,258  
Gross Loans Receivable Held to Maturity        
Ending Balance Evaluated for Impairment Under ASC 310-10-35 22,686 15,951    
Ending Balance Evaluated for Impairment Under ASC 450-20 510,378 549,457    
Total 533,064 565,408    
Residential real estate        
Allowance For Loan Losses        
Ending Balance Under ASC 310-10-35 110 168    
Ending Balance Under ASC 450-20 1,328 1,617    
Total 1,438 1,785 2,224  
Gross Loans Receivable Held to Maturity        
Ending Balance Evaluated for Impairment Under ASC 310-10-35 16,740 20,251    
Ending Balance Evaluated for Impairment Under ASC 450-20 581,002 653,352    
Total 597,742 673,603    
Consumer        
Allowance For Loan Losses        
Ending Balance Under ASC 310-10-35 450 749    
Ending Balance Under ASC 450-20 4,403 4,433    
Total 4,853 5,182 $ 9,156  
Gross Loans Receivable Held to Maturity        
Ending Balance Evaluated for Impairment Under ASC 310-10-35 4,536 7,004    
Ending Balance Evaluated for Impairment Under ASC 450-20 447,697 433,154    
Total $ 452,233 $ 440,158