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Loans (Not Covered by Share Agreements (Past Due Financing Receivables)) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due $ 18,137 $ 19,945
Current 6,312,508 5,269,458
Nonaccrual 62,581 64,299
Total 6,393,226 5,353,702
30-59 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 13,375 10,653
60-89 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 3,932 9,206
90 Days or More Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 830 86
Commercial    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 8,700 6,238
Current 4,777,349 3,794,310
Nonaccrual 23,826 25,299
Total 4,809,875 3,825,847
Commercial | Commercial    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 1,605 1,423
Current 1,637,773 1,281,241
Nonaccrual 7,228 4,601
Total 1,646,606 1,287,265
Commercial | Commercial real estate    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 7,095 4,815
Current 3,139,576 2,513,069
Nonaccrual 16,598 20,698
Total 3,163,269 2,538,582
Commercial | 30-59 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 6,015 2,013
Commercial | 30-59 Days Past Due | Commercial    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 1,246 1,127
Commercial | 30-59 Days Past Due | Commercial real estate    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 4,769 886
Commercial | 60-89 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 2,585 4,148
Commercial | 60-89 Days Past Due | Commercial    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 259 219
Commercial | 60-89 Days Past Due | Commercial real estate    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 2,326 3,929
Commercial | 90 Days or More Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 100 77
Commercial | 90 Days or More Past Due | Commercial    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 100 77
Commercial | 90 Days or More Past Due | Commercial real estate    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 0 0
Agricultural and agricultural real estate    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 738 3,390
Current 497,546 472,597
Nonaccrual 13,304 13,331
Total 511,588 489,318
Agricultural and agricultural real estate | 30-59 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 604 199
Agricultural and agricultural real estate | 60-89 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 134 3,191
Agricultural and agricultural real estate | 90 Days or More Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 0 0
Residential real estate    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 2,292 5,832
Current 601,120 590,626
Nonaccrual 20,867 21,466
Total 624,279 617,924
Residential real estate | 30-59 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 2,022 4,986
Residential real estate | 60-89 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 270 846
Residential real estate | 90 Days or More Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 0 0
Consumer    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 6,407 4,485
Current 436,493 411,925
Nonaccrual 4,584 4,203
Total 447,484 420,613
Consumer | 30-59 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 4,734 3,455
Consumer | 60-89 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 943 1,021
Consumer | 90 Days or More Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due $ 730 $ 9