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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
Mar. 31, 2014
Mar. 31, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]    
Recorded Investment in Loans, Individually Evaluated for Impairment $ 106,596 $ 112,721
Recorded Investment in Loans, Collectively Evaluated for Impairment 3,159,726 3,084,280
Allowance for Loan Losses, Individually Evaluated for Impairment 4,001 4,071
Allowance for Loan Losses, Collectively Evaluated for Impairment 64,724 88,147
Commercial and Industrial [Member]
   
Financing Receivable, Allowance for Credit Losses [Line Items]    
Recorded Investment in Loans, Individually Evaluated for Impairment 5,940 4,579
Recorded Investment in Loans, Collectively Evaluated for Impairment 484,713 528,362
Allowance for Loan Losses, Individually Evaluated for Impairment 882 1,055
Allowance for Loan Losses, Collectively Evaluated for Impairment 7,954 11,258
Commercial Real Estate [Member]
   
Financing Receivable, Allowance for Credit Losses [Line Items]    
Recorded Investment in Loans, Individually Evaluated for Impairment 33,907 41,505
Recorded Investment in Loans, Collectively Evaluated for Impairment 2,160,144 1,954,693
Allowance for Loan Losses, Individually Evaluated for Impairment 320 1
Allowance for Loan Losses, Collectively Evaluated for Impairment 39,080 46,724
Construction [Member]
   
Financing Receivable, Allowance for Credit Losses [Line Items]    
Recorded Investment in Loans, Individually Evaluated for Impairment 26,688 27,491
Recorded Investment in Loans, Collectively Evaluated for Impairment 16,218 28,212
Allowance for Loan Losses, Individually Evaluated for Impairment      
Allowance for Loan Losses, Collectively Evaluated for Impairment 458 2,124
SFR Mortgage [Member]
   
Financing Receivable, Allowance for Credit Losses [Line Items]    
Recorded Investment in Loans, Individually Evaluated for Impairment 11,692 13,593
Recorded Investment in Loans, Collectively Evaluated for Impairment 178,207 148,429
Allowance for Loan Losses, Individually Evaluated for Impairment 47 428
Allowance for Loan Losses, Collectively Evaluated for Impairment 2,235 3,178
Dairy & Livestock and Agribusiness [Member]
   
Financing Receivable, Allowance for Credit Losses [Line Items]    
Recorded Investment in Loans, Individually Evaluated for Impairment 27,972 25,327
Recorded Investment in Loans, Collectively Evaluated for Impairment 184,985 258,545
Allowance for Loan Losses, Individually Evaluated for Impairment 2,656 2,560
Allowance for Loan Losses, Collectively Evaluated for Impairment 6,611 14,011
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 81,041 109,727
Allowance for Loan Losses, Individually Evaluated for Impairment      
Allowance for Loan Losses, Collectively Evaluated for Impairment 1,519 2,632
Consumer and Other Loans [Member]
   
Financing Receivable, Allowance for Credit Losses [Line Items]    
Recorded Investment in Loans, Individually Evaluated for Impairment 397 226
Recorded Investment in Loans, Collectively Evaluated for Impairment 54,418 56,312
Allowance for Loan Losses, Individually Evaluated for Impairment 96 27
Allowance for Loan Losses, Collectively Evaluated for Impairment 854 1,106
Unallocated [Member]
   
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for Loan Losses, Collectively Evaluated for Impairment $ 6,013 $ 7,114