Quarterly report pursuant to Section 13 or 15(d)

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

v3.2.0.727
Loans - Allowance for Loan Losses and Allowance for Off-Balance Sheet Items (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Allowance for loan losses:        
Balance at beginning of period     $ 52,666  
Balance at end of period $ 50,820   50,820  
Allowance for loan losses [Member]        
Allowance for loan losses:        
Balance at beginning of period 52,951 $ 56,593 52,666 $ 57,555
Charge-offs (1,169) (2,547) (1,255) (4,151)
Recoveries on loans previously charged off 1,441 1,741 3,485 5,992
Net loan (charge-offs) recoveries 272 (806) 2,230 1,841
(Negative provision) provision charged to operating expense (2,403) (3,901) (4,076) (7,510)
Balance at end of period 50,820 51,886 50,820 51,886
Allowance for off-balance sheet items [Member]        
Allowance for loan losses:        
Balance at beginning of period 1,054 1,557 1,366 1,248
(Negative provision) provision charged to operating expense (92) 35 (404) 344
Balance at end of period 962 1,592 962 1,592
Non-PCI Loans [Member]        
Allowance for loan losses:        
Balance at beginning of period 51,515 56,593 51,640 57,555
Charge-offs (1,221) (2,547) (1,255) (4,151)
Recoveries on loans previously charged off 1,793 1,741 3,485 5,992
(Negative provision) provision charged to operating expense (2,619) (3,901) (4,402) (7,510)
Balance at end of period 49,468 $ 51,886 49,468 $ 51,886
Non-PCI Loans [Member] | Allowance for loan losses [Member]        
Allowance for loan losses:        
Balance at beginning of period 51,515   51,640  
Charge-offs (1,221)   (1,255)  
Recoveries on loans previously charged off 1,793   3,485  
Net loan (charge-offs) recoveries 572   2,230  
(Negative provision) provision charged to operating expense (2,619)   (4,402)  
Balance at end of period 49,468   49,468  
Non-PCI Loans [Member] | Allowance for off-balance sheet items [Member]        
Allowance for loan losses:        
Balance at beginning of period 1,054   1,366  
(Negative provision) provision charged to operating expense (92)   (404)  
Balance at end of period 962   962  
PCI Loans [Member]        
Allowance for loan losses:        
Balance at beginning of period 1,436   1,026  
Charge-offs 52      
Recoveries on loans previously charged off (352)      
(Negative provision) provision charged to operating expense 216   326  
Balance at end of period 1,352   1,352  
PCI Loans [Member] | Allowance for loan losses [Member]        
Allowance for loan losses:        
Balance at beginning of period 1,436   1,026  
Charge-offs 52   0  
Recoveries on loans previously charged off (352)   0  
Net loan (charge-offs) recoveries (300)   0  
(Negative provision) provision charged to operating expense 216   326  
Balance at end of period 1,352   1,352  
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   0  
Balance at end of period $ 0   $ 0