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Non-Covered Loan and Lease Finance Receivables and Allowance for Loan Losses - Schedule of Held-for-Investment Loans, Individually Evaluated for Impairment by Class of Loans (Detail) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]      
Recorded Investment, Total non-covered impaired loans $ 92,658 $ 108,679 $ 106,909
Unpaid Principal Balance, Total non-covered impaired loans 108,519 126,530 118,157
Related Allowance, Total non-covered impaired loans 754 3,485 3,174
Average Recorded Investment, Total non-covered impaired loans 96,419 112,594  
Interest Income Recognized, Total non-covered impaired loans 2,419 2,393  
Recorded Investment, With no related allowance recorded 90,564 91,026 93,932
Unpaid Principal Balance, With no related allowance recorded 106,069 108,025 104,487
Related Allowance, With no related allowance recorded         
Average Recorded Investment, With no related allowance recorded 94,305 94,289  
Interest Income Recognized, With no related allowance recorded 2,419 2,156  
Recorded Investment, With a related allowance recorded 2,094 17,653 12,977
Unpaid Principal Balance, With a related allowance recorded 2,450 18,505 13,670
Related Allowance, With a related allowance recorded 754 3,485 3,174
Average Recorded Investment, With a related allowance recorded 2,114 18,305  
Interest Income Recognized, With a related allowance recorded    237  
Commercial and industrial [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Recorded Investment, With no related allowance recorded 6,096 4,595 4,668
Unpaid Principal Balance, With no related allowance recorded 7,861 6,020 5,927
Related Allowance, With no related allowance recorded         
Average Recorded Investment, With no related allowance recorded 5,849 5,131  
Interest Income Recognized, With no related allowance recorded 44 161  
Recorded Investment, With a related allowance recorded 1,613 388 365
Unpaid Principal Balance, With a related allowance recorded 1,951 408 379
Related Allowance, With a related allowance recorded 711 387 365
Average Recorded Investment, With a related allowance recorded 1,626 417  
Interest Income Recognized, With a related allowance recorded        
Commercial real estate Owner occupied [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Recorded Investment, With no related allowance recorded 8,742 13,361 13,041
Unpaid Principal Balance, With no related allowance recorded 9,896 14,412 14,133
Related Allowance, With no related allowance recorded         
Average Recorded Investment, With no related allowance recorded 9,025 13,635  
Interest Income Recognized, With no related allowance recorded 238 494  
Recorded Investment, With a related allowance recorded    7   
Unpaid Principal Balance, With a related allowance recorded    9   
Related Allowance, With a related allowance recorded    1   
Average Recorded Investment, With a related allowance recorded    11  
Interest Income Recognized, With a related allowance recorded        
Commercial real estate Non-owner occupied [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Recorded Investment, With no related allowance recorded 22,633 25,631 20,399
Unpaid Principal Balance, With no related allowance recorded 29,545 36,851 26,155
Related Allowance, With no related allowance recorded         
Average Recorded Investment, With no related allowance recorded 23,252 26,838  
Interest Income Recognized, With no related allowance recorded 541 553  
Recorded Investment, With a related allowance recorded         
Unpaid Principal Balance, With a related allowance recorded         
Related Allowance, With a related allowance recorded         
Average Recorded Investment, With a related allowance recorded        
Interest Income Recognized, With a related allowance recorded        
Construction Speculative [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Recorded Investment, With no related allowance recorded 17,318 10,369 17,617
Unpaid Principal Balance, With no related allowance recorded 18,407 10,956 18,408
Related Allowance, With no related allowance recorded         
Average Recorded Investment, With no related allowance recorded 17,440 10,522  
Interest Income Recognized, With no related allowance recorded 232     
Recorded Investment, With a related allowance recorded    7,651   
Unpaid Principal Balance, With a related allowance recorded    7,651   
Related Allowance, With a related allowance recorded    144   
Average Recorded Investment, With a related allowance recorded    7,651  
Interest Income Recognized, With a related allowance recorded    232  
Construction Non-speculative [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Recorded Investment, With no related allowance recorded 9,101 9,219 9,201
Unpaid Principal Balance, With no related allowance recorded 9,101 9,219 9,201
Related Allowance, With no related allowance recorded         
Average Recorded Investment, With no related allowance recorded 9,145 9,219  
Interest Income Recognized, With no related allowance recorded 463 428  
Recorded Investment, With a related allowance recorded         
Unpaid Principal Balance, With a related allowance recorded         
Related Allowance, With a related allowance recorded         
Average Recorded Investment, With a related allowance recorded        
Interest Income Recognized, With a related allowance recorded        
SFR mortgage [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Recorded Investment, With no related allowance recorded 7,285 10,156 10,919
Unpaid Principal Balance, With no related allowance recorded 9,685 11,838 12,516
Related Allowance, With no related allowance recorded         
Average Recorded Investment, With no related allowance recorded 7,934 9,487  
Interest Income Recognized, With no related allowance recorded 82 75  
Recorded Investment, With a related allowance recorded 470 2,649 486
Unpaid Principal Balance, With a related allowance recorded 484 2,764 489
Related Allowance, With a related allowance recorded 39 290 103
Average Recorded Investment, With a related allowance recorded 476 2,636  
Interest Income Recognized, With a related allowance recorded    5  
Dairy & livestock and agribusiness [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Recorded Investment, With no related allowance recorded 18,939 17,553 17,702
Unpaid Principal Balance, With no related allowance recorded 20,698 18,515 17,702
Related Allowance, With no related allowance recorded         
Average Recorded Investment, With no related allowance recorded 21,205 19,308  
Interest Income Recognized, With no related allowance recorded 819 445  
Recorded Investment, With a related allowance recorded    6,941 12,110
Unpaid Principal Balance, With a related allowance recorded    7,654 12,783
Related Allowance, With a related allowance recorded    2,658 2,702
Average Recorded Investment, With a related allowance recorded    7,571  
Interest Income Recognized, With a related allowance recorded        
Municipal lease finance receivables [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Recorded Investment, With no related allowance recorded         
Unpaid Principal Balance, With no related allowance recorded         
Related Allowance, With no related allowance recorded         
Average Recorded Investment, With no related allowance recorded        
Interest Income Recognized, With no related allowance recorded        
Recorded Investment, With a related allowance recorded         
Unpaid Principal Balance, With a related allowance recorded         
Related Allowance, With a related allowance recorded         
Average Recorded Investment, With a related allowance recorded        
Interest Income Recognized, With a related allowance recorded        
Consumer and other loans [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Recorded Investment, With no related allowance recorded 450 142 385
Unpaid Principal Balance, With no related allowance recorded 876 214 445
Related Allowance, With no related allowance recorded         
Average Recorded Investment, With no related allowance recorded 455 149  
Interest Income Recognized, With no related allowance recorded        
Recorded Investment, With a related allowance recorded 11 17 16
Unpaid Principal Balance, With a related allowance recorded 15 19 19
Related Allowance, With a related allowance recorded 4 5 4
Average Recorded Investment, With a related allowance recorded 12 19  
Interest Income Recognized, With a related allowance recorded