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Loans (Allowance for Credit Losses on Financing Receivables) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Allowance For Loan Losses        
Ending Balance Under ASC 310-10-35 $ 7,554 $ 4,755    
Ending Balance Under ASC 450-20 54,409 50,931    
Total 61,963 55,686 $ 54,324 $ 48,685
Gross Loans Receivable Held to Maturity        
Ending Balance Evaluated for Impairment Under ASC 310-10-35 81,796 78,468    
Ending Balance Evaluated for Impairment Under ASC 450-20 7,329,085 6,314,758    
Total 7,410,881 6,393,226    
Commercial        
Gross Loans Receivable Held to Maturity        
Total 5,731,712 4,809,875    
Commercial | Commercial        
Allowance For Loan Losses        
Ending Balance Under ASC 310-10-35 5,733 1,613    
Ending Balance Under ASC 450-20 18,772 16,485    
Total 24,505 18,098 14,765  
Gross Loans Receivable Held to Maturity        
Ending Balance Evaluated for Impairment Under ASC 310-10-35 24,202 7,415    
Ending Balance Evaluated for Impairment Under ASC 450-20 1,996,029 1,639,191    
Total 2,020,231 1,646,606    
Commercial | Commercial real estate        
Allowance For Loan Losses        
Ending Balance Under ASC 310-10-35 218 766    
Ending Balance Under ASC 450-20 25,320 21,184    
Total 25,538 21,950 24,319  
Gross Loans Receivable Held to Maturity        
Ending Balance Evaluated for Impairment Under ASC 310-10-35 14,388 23,705    
Ending Balance Evaluated for Impairment Under ASC 450-20 3,697,093 3,139,564    
Total 3,711,481 3,163,269    
Agricultural and agricultural real estate        
Allowance For Loan Losses        
Ending Balance Under ASC 310-10-35 686 546    
Ending Balance Under ASC 450-20 4,267 3,712    
Total 4,953 4,258 4,210  
Gross Loans Receivable Held to Maturity        
Ending Balance Evaluated for Impairment Under ASC 310-10-35 15,951 13,304    
Ending Balance Evaluated for Impairment Under ASC 450-20 549,457 498,284    
Total 565,408 511,588    
Residential real estate        
Allowance For Loan Losses        
Ending Balance Under ASC 310-10-35 168 430    
Ending Balance Under ASC 450-20 1,617 1,794    
Total 1,785 2,224 2,263  
Gross Loans Receivable Held to Maturity        
Ending Balance Evaluated for Impairment Under ASC 310-10-35 20,251 27,141    
Ending Balance Evaluated for Impairment Under ASC 450-20 653,352 597,138    
Total 673,603 624,279    
Consumer        
Allowance For Loan Losses        
Ending Balance Under ASC 310-10-35 749 1,400    
Ending Balance Under ASC 450-20 4,433 7,756    
Total 5,182 9,156 $ 8,767  
Gross Loans Receivable Held to Maturity        
Ending Balance Evaluated for Impairment Under ASC 310-10-35 7,004 6,903    
Ending Balance Evaluated for Impairment Under ASC 450-20 433,154 440,581    
Total $ 440,158 $ 447,484