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Non-Covered Loan and Lease Finance Receivables and Allowance for Loan Losses - Schedule of Recorded Investment in Non-Covered Loans Held-for-Investment, and Related Allowance for Loan Losses by Portfolio Segment (Detail) (Non-Covered Loans [Member], USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Sep. 30, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]    
Recorded Investment in Loans, Individually Evaluated for Impairment $ 92,658 $ 108,679
Recorded Investment in Loans, Collectively Evaluated for Impairment 3,490,089 3,181,792
Allowance for Loan Losses, Individually Evaluated for Impairment 754 3,485
Allowance for Loan Losses, Collectively Evaluated for Impairment 58,828 77,228
Commercial and industrial [Member]
   
Financing Receivable, Allowance for Credit Losses [Line Items]    
Recorded Investment in Loans, Individually Evaluated for Impairment 7,709 4,983
Recorded Investment in Loans, Collectively Evaluated for Impairment 505,935 505,583
Allowance for Loan Losses, Individually Evaluated for Impairment 711 387
Allowance for Loan Losses, Collectively Evaluated for Impairment 7,954 10,257
Commercial real estate [Member]
   
Financing Receivable, Allowance for Credit Losses [Line Items]    
Recorded Investment in Loans, Individually Evaluated for Impairment 31,375 38,999
Recorded Investment in Loans, Collectively Evaluated for Impairment 2,434,540 2,087,416
Allowance for Loan Losses, Individually Evaluated for Impairment    1
Allowance for Loan Losses, Collectively Evaluated for Impairment 35,633 43,418
Construction [Member]
   
Financing Receivable, Allowance for Credit Losses [Line Items]    
Recorded Investment in Loans, Individually Evaluated for Impairment 26,419 27,239
Recorded Investment in Loans, Collectively Evaluated for Impairment 40,810 20,409
Allowance for Loan Losses, Individually Evaluated for Impairment    144
Allowance for Loan Losses, Collectively Evaluated for Impairment 790 1,455
SFR mortgage [Member]
   
Financing Receivable, Allowance for Credit Losses [Line Items]    
Recorded Investment in Loans, Individually Evaluated for Impairment 7,755 12,805
Recorded Investment in Loans, Collectively Evaluated for Impairment 185,450 179,325
Allowance for Loan Losses, Individually Evaluated for Impairment 39 290
Allowance for Loan Losses, Collectively Evaluated for Impairment 2,266 3,171
Dairy & livestock and agribusiness [Member]
   
Financing Receivable, Allowance for Credit Losses [Line Items]    
Recorded Investment in Loans, Individually Evaluated for Impairment 18,939 24,494
Recorded Investment in Loans, Collectively Evaluated for Impairment 173,991 237,144
Allowance for Loan Losses, Individually Evaluated for Impairment    2,658
Allowance for Loan Losses, Collectively Evaluated for Impairment 4,278 9,429
Municipal lease finance receivables [Member]
   
Financing Receivable, Allowance for Credit Losses [Line Items]    
Recorded Investment in Loans, Individually Evaluated for Impairment      
Recorded Investment in Loans, Collectively Evaluated for Impairment 80,013 99,188
Allowance for Loan Losses, Individually Evaluated for Impairment      
Allowance for Loan Losses, Collectively Evaluated for Impairment 1,468 2,438
Consumer and other loans [Member]
   
Financing Receivable, Allowance for Credit Losses [Line Items]    
Recorded Investment in Loans, Individually Evaluated for Impairment 461 159
Recorded Investment in Loans, Collectively Evaluated for Impairment 69,350 52,727
Allowance for Loan Losses, Individually Evaluated for Impairment 4 5
Allowance for Loan Losses, Collectively Evaluated for Impairment 882 1,045
Unallocated [Member]
   
Financing Receivable, Allowance for Credit Losses [Line Items]    
Recorded Investment in Loans, Individually Evaluated for Impairment      
Recorded Investment in Loans, Collectively Evaluated for Impairment      
Allowance for Loan Losses, Individually Evaluated for Impairment      
Allowance for Loan Losses, Collectively Evaluated for Impairment $ 5,557 $ 6,015