Quarterly report pursuant to Section 13 or 15(d)

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

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Loans - Allowance for Credit Losses by Portfolio Segment (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Financing Receivable Allowance For Credit Losses [Line Items]      
Beginning balance $ 90,426    
Ending balance 88,392    
Loans receivable 4,817,151   $ 4,880,168
Non-PCI Loans and Leases      
Financing Receivable Allowance For Credit Losses [Line Items]      
Beginning balance 90,426 $ 61,408  
Adjusted balance   78,841  
Less loans charged off 3,505 27,474  
Recoveries on loans receivable previously charged off (507) (216)  
Provision for credit losses 964 14,917  
Ending balance 88,392 66,500  
Individually evaluated 12,156 1,899  
Collectively evaluated 76,236 64,601  
Loans receivable 4,817,151 4,543,636  
Individually evaluated 63,466 47,296  
Collectively evaluated 4,753,686 4,496,340  
Non-PCI Loans and Leases | ASU 2016-13 | Adjustment Related to Adoption of ASU      
Financing Receivable Allowance For Credit Losses [Line Items]      
Beginning balance   17,433  
Real Estate      
Financing Receivable Allowance For Credit Losses [Line Items]      
Beginning balance 51,876    
Ending balance 57,762    
Loans receivable 3,700,516   3,699,649
Real Estate | Non-PCI Loans and Leases      
Financing Receivable Allowance For Credit Losses [Line Items]      
Beginning balance 51,877 36,435  
Adjusted balance   50,463  
Less loans charged off 1,509 14,143  
Recoveries on loans receivable previously charged off (273) (58)  
Provision for credit losses 7,121 2,754  
Ending balance 57,762 39,132  
Individually evaluated 11 81  
Collectively evaluated 57,751 39,051  
Loans receivable 3,700,516 3,578,395  
Individually evaluated 39,144 35,459  
Collectively evaluated 3,661,372 3,542,936  
Real Estate | Non-PCI Loans and Leases | ASU 2016-13 | Adjustment Related to Adoption of ASU      
Financing Receivable Allowance For Credit Losses [Line Items]      
Beginning balance   14,028  
Commercial and Industrial      
Financing Receivable Allowance For Credit Losses [Line Items]      
Beginning balance 21,410    
Ending balance 16,387    
Loans receivable 707,073   757,255
Commercial and Industrial | Non-PCI Loans and Leases      
Financing Receivable Allowance For Credit Losses [Line Items]      
Beginning balance 21,410 16,206  
Adjusted balance   13,709  
Less loans charged off 93 12,150  
Recoveries on loans receivable previously charged off (99) (84)  
Provision for credit losses (5,029) 9,945  
Ending balance 16,387 11,588  
Individually evaluated 7,584 147  
Collectively evaluated 8,803 11,441  
Loans receivable 707,073 472,714  
Individually evaluated 14,297 5,444  
Collectively evaluated 692,777 467,270  
Commercial and Industrial | Non-PCI Loans and Leases | ASU 2016-13 | Adjustment Related to Adoption of ASU      
Financing Receivable Allowance For Credit Losses [Line Items]      
Beginning balance   (2,497)  
Leases Receivable      
Financing Receivable Allowance For Credit Losses [Line Items]      
Beginning balance 17,140    
Ending balance 14,243    
Loans receivable 409,562   $ 423,264
Leases Receivable | Non-PCI Loans and Leases      
Financing Receivable Allowance For Credit Losses [Line Items]      
Beginning balance 17,139 8,767  
Adjusted balance   14,669  
Less loans charged off 1,903 1,181  
Recoveries on loans receivable previously charged off (135) (74)  
Provision for credit losses (1,128) 2,218  
Ending balance 14,243 15,780  
Individually evaluated 4,561 1,671  
Collectively evaluated 9,682 14,109  
Loans receivable 409,562 492,527  
Individually evaluated 10,025 6,393  
Collectively evaluated $ 399,537 486,134  
Leases Receivable | Non-PCI Loans and Leases | ASU 2016-13 | Adjustment Related to Adoption of ASU      
Financing Receivable Allowance For Credit Losses [Line Items]      
Beginning balance   $ 5,902