Annual report pursuant to Section 13 and 15(d)

Loans Receivable - Allowance for Credit Losses by Portfolio Segment (Detail)

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Loans Receivable - Allowance for Credit Losses by Portfolio Segment (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Allowance for credit losses:      
Beginning balance $ 90,426    
Ending balance 72,557 $ 90,426  
Non-PCI Loans and Leases      
Allowance for credit losses:      
Beginning balance 90,426 61,408 $ 31,974
Adjusted balance   78,841  
Less loans charged off 6,373 33,952 4,588
Recoveries on loans receivable previously charged off (12,650) (3,063) (3,852)
Provision (recovery) for credit losses (24,146) 42,474 30,170
Ending balance 72,557 90,426 61,408
Non-PCI Loans and Leases | ASU 2016-13 | Adjustment Related to Adoption of ASU      
Allowance for credit losses:      
Beginning balance   17,433  
Ending balance     17,433
Real Estate      
Allowance for credit losses:      
Beginning balance 51,876    
Ending balance 48,890 51,876  
Real Estate | Non-PCI Loans and Leases      
Allowance for credit losses:      
Beginning balance 51,876 36,435 18,482
Adjusted balance   50,463  
Less loans charged off 1,427 15,567 132
Recoveries on loans receivable previously charged off (10,807) (2,124) (2,190)
Provision (recovery) for credit losses (12,366) 14,856 15,896
Ending balance 48,890 51,876 36,435
Real Estate | Non-PCI Loans and Leases | ASU 2016-13 | Adjustment Related to Adoption of ASU      
Allowance for credit losses:      
Beginning balance   14,028  
Ending balance     14,028
Commercial and Industrial      
Allowance for credit losses:      
Beginning balance 21,410    
Ending balance 12,418 21,410  
Commercial and Industrial | Non-PCI Loans and Leases      
Allowance for credit losses:      
Beginning balance 21,410 16,206 7,162
Adjusted balance   13,709  
Less loans charged off 546 13,312 1,293
Recoveries on loans receivable previously charged off (897) (336) (1,241)
Provision (recovery) for credit losses (9,343) 20,677 9,097
Ending balance 12,418 21,410 16,206
Commercial and Industrial | Non-PCI Loans and Leases | ASU 2016-13 | Adjustment Related to Adoption of ASU      
Allowance for credit losses:      
Beginning balance   (2,497)  
Ending balance     (2,497)
Leases Receivable      
Allowance for credit losses:      
Beginning balance 17,140    
Ending balance 11,249 17,140  
Leases Receivable | Non-PCI Loans and Leases      
Allowance for credit losses:      
Beginning balance 17,140 8,767 6,303
Adjusted balance   14,669  
Less loans charged off 4,400 5,073 3,162
Recoveries on loans receivable previously charged off (946) (603) (422)
Provision (recovery) for credit losses (2,437) 6,941 5,205
Ending balance $ 11,249 17,140 8,767
Leases Receivable | Non-PCI Loans and Leases | ASU 2016-13 | Adjustment Related to Adoption of ASU      
Allowance for credit losses:      
Beginning balance   $ 5,902  
Ending balance     5,902
Unallocated | Non-PCI Loans and Leases      
Allowance for credit losses:      
Beginning balance     27
Provision (recovery) for credit losses     $ (27)