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Allowance for Loan and Lease Losses - Summary of Allowance for Loan Losses by Type (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]        
Individually evaluated for impairment $ 25,686 $ 16,325    
Collectively evaluated for impairment 37,277 38,099    
Total allowance 64,642 57,200 $ 47,518 $ 55,864
Financing Receivables        
Individually evaluated for impairment 216,429 169,504    
Collectively evaluated for impairment 7,085,976 5,820,504    
Loans Outstanding 7,431,936 6,098,475    
Receivables acquired with deteriorated credit quality        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Total allowance 1,679 2,776    
Financing Receivables        
Loans Outstanding 129,531 108,467    
Residential real estate        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Individually evaluated for impairment 3,000 4,118    
Collectively evaluated for impairment 3,199 2,283    
Total allowance 7,106 8,025 8,342 11,779
Financing Receivables        
Individually evaluated for impairment 10,364 13,106    
Collectively evaluated for impairment 918,710 806,912    
Loans Outstanding 994,811 902,207    
Residential real estate | Receivables acquired with deteriorated credit quality        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Total allowance 907 1,624    
Financing Receivables        
Loans Outstanding 65,737 82,189    
Commercial real estate        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Individually evaluated for impairment 3,846 2,932    
Collectively evaluated for impairment 13,328 14,000    
Total allowance 17,946 18,014 16,884 22,562
Financing Receivables        
Individually evaluated for impairment 54,005 49,794    
Collectively evaluated for impairment 3,249,974 2,385,636    
Loans Outstanding 3,348,427 2,456,140    
Commercial real estate | Receivables acquired with deteriorated credit quality        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Total allowance 772 1,082    
Financing Receivables        
Loans Outstanding 44,448 20,710    
Commercial non real estate        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Individually evaluated for impairment 6,475 5,443    
Collectively evaluated for impairment 6,515 10,483    
Total allowance 12,990 15,996 10,550 11,222
Financing Receivables        
Individually evaluated for impairment 49,825 62,158    
Collectively evaluated for impairment 1,079,295 1,056,806    
Loans Outstanding 1,132,316 1,121,723    
Commercial non real estate | Receivables acquired with deteriorated credit quality        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Total allowance 0 70    
Financing Receivables        
Loans Outstanding 3,196 2,759    
Agriculture        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Individually evaluated for impairment 12,278 3,780    
Collectively evaluated for impairment 12,837 10,172    
Total allowance 25,115 13,952 10,655 9,296
Financing Receivables        
Individually evaluated for impairment 101,840 44,253    
Collectively evaluated for impairment 1,721,219 1,461,230    
Loans Outstanding 1,838,313 1,507,021    
Agriculture | Receivables acquired with deteriorated credit quality        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Total allowance 0 0    
Financing Receivables        
Loans Outstanding 15,254 1,538    
Consumer        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Individually evaluated for impairment 87 52    
Collectively evaluated for impairment 351 296    
Total allowance 438 348 264 312
Financing Receivables        
Individually evaluated for impairment 395 193    
Collectively evaluated for impairment 74,301 71,549    
Loans Outstanding 75,592 73,013    
Consumer | Receivables acquired with deteriorated credit quality        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Total allowance 0 0    
Financing Receivables        
Loans Outstanding 896 1,271    
Other        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Individually evaluated for impairment 0 0    
Collectively evaluated for impairment 1,047 865    
Total allowance 1,047 865 $ 823 $ 693
Financing Receivables        
Individually evaluated for impairment 0 0    
Collectively evaluated for impairment 42,477 38,371    
Loans Outstanding 42,477 38,371    
Other | Receivables acquired with deteriorated credit quality        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Total allowance 0 0    
Financing Receivables        
Loans Outstanding $ 0 $ 0