Annual report pursuant to Section 13 and 15(d)

Loans - Allowance for Loan Losses and Allowance for Off-Balance Sheet Items (Detail)

v3.3.1.900
Loans - Allowance for Loan Losses and Allowance for Off-Balance Sheet Items (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Allowance for loan losses:                      
Balance at beginning of period       $ 52,666         $ 52,666    
(Negative provision) provision charged to operating expense $ (3,835) $ (3,704) $ (2,403) (1,672) $ 1,312 $ (60) $ (3,902) $ (3,608) (11,614) $ (6,258) $ 576
Balance at end of period 42,935       52,666       42,935 52,666  
Allowance for loan losses [Member]                      
Allowance for loan losses:                      
Balance at beginning of period       52,666       57,555 52,666 57,555 63,305
Charge-offs                 (3,531) (6,992) (11,862)
Recoveries on loans previously charged off                 5,423 8,361 5,536
Net loan recoveries (charge-offs)                 1,892 1,369 (6,326)
(Negative provision) provision charged to operating expense                 (11,623) (6,258) 576
Balance at end of period 42,935       52,666       42,935 52,666 57,555
Allowance for off-balance sheet items [Member]                      
Allowance for loan losses:                      
Balance at beginning of period       1,366       1,248 1,366 1,248 1,824
(Negative provision) provision charged to operating expense                 (380) 118 (576)
Balance at end of period 986       1,366       986 1,366 1,248
Non-PCI Loans [Member]                      
Allowance for loan losses:                      
Balance at beginning of period       51,640       $ 57,555 51,640 57,555  
Charge-offs                 (3,531) (6,992)  
Recoveries on loans previously charged off                 5,423 8,361  
(Negative provision) provision charged to operating expense                 (16,038) (7,284)  
Balance at end of period 37,494       51,640       37,494 51,640 $ 57,555
Non-PCI Loans [Member] | Allowance for loan losses [Member]                      
Allowance for loan losses:                      
Balance at beginning of period       51,640         51,640    
Charge-offs                 (3,531)    
Recoveries on loans previously charged off                 5,423    
Net loan recoveries (charge-offs)                 1,892    
(Negative provision) provision charged to operating expense                 (16,038)    
Balance at end of period 37,494       51,640       37,494 51,640  
Non-PCI Loans [Member] | Allowance for off-balance sheet items [Member]                      
Allowance for loan losses:                      
Balance at beginning of period       1,366         1,366    
(Negative provision) provision charged to operating expense                 (380)    
Balance at end of period 986       1,366       986 1,366  
PCI Loans [Member]                      
Allowance for loan losses:                      
Balance at beginning of period       1,026         1,026    
(Negative provision) provision charged to operating expense                 4,415    
Balance at end of period 5,441       1,026       5,441 1,026  
PCI Loans [Member] | Allowance for loan losses [Member]                      
Allowance for loan losses:                      
Balance at beginning of period       1,026         1,026    
Charge-offs                 0    
Recoveries on loans previously charged off                 0    
Net loan recoveries (charge-offs)                 0    
(Negative provision) provision charged to operating expense                 4,415    
Balance at end of period 5,441       1,026       5,441 1,026  
PCI Loans [Member] | Allowance for off-balance sheet items [Member]                      
Allowance for loan losses:                      
Balance at beginning of period       $ 0         0    
(Negative provision) provision charged to operating expense                 0    
Balance at end of period $ 0       $ 0       $ 0 $ 0