Quarterly report pursuant to Section 13 or 15(d)

Loans - Analysis of Past Due Loans, Disaggregated by Loan Class, Non-PCI (Detail)

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Loans - Analysis of Past Due Loans, Disaggregated by Loan Class, Non-PCI (Detail) - USD ($)
Jun. 30, 2021
Dec. 31, 2020
Financing Receivable, Past Due [Line Items]    
Past due loans receivable $ 22,181,000 $ 53,640,000
Current 4,797,911,000 4,826,528,000
Loans receivable 4,820,092,000 4,880,168,000
Accruing 90 days or more past due loans receivable 12,446,000 0
30-59 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 3,711,000 9,026,000
60-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 2,735,000 15,081,000
90 Days or More Past Due    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 15,735,000 29,533,000
Real Estate    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 3,040,000 30,332,000
Current 3,797,704,000 3,669,317,000
Loans receivable 3,800,744,000 3,699,649,000
Real Estate | Retail    
Financing Receivable, Past Due [Line Items]    
Current 828,157,000 824,606,000
Loans receivable 828,157,000 824,606,000
Real Estate | Hospitality    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable   11,076,000
Current 795,651,000 848,877,000
Loans receivable 795,651,000 859,953,000
Real Estate | Other    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 458,000 731,000
Current 1,766,134,000 1,609,646,000
Loans receivable 1,766,592,000 1,610,377,000
Real Estate | Total commercial property loans    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 458,000 11,807,000
Current 3,389,942,000 3,283,129,000
Loans receivable 3,390,400,000 3,294,936,000
Real Estate | Construction    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable   12,807,000
Current 61,614,000 46,075,000
Loans receivable 61,614,000 58,882,000
Real Estate | Residential/Consumer Loans    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 2,582,000 5,718,000
Current 346,148,000 340,113,000
Loans receivable 348,730,000 345,831,000
Real Estate | 30-59 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable   4,693,000
Real Estate | 30-59 Days Past Due | Residential/Consumer Loans    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable   4,693,000
Real Estate | 60-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 2,022,000 13,268,000
Real Estate | 60-89 Days Past Due | Construction    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable   12,807,000
Real Estate | 60-89 Days Past Due | Residential/Consumer Loans    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 2,022,000 461,000
Real Estate | 90 Days or More Past Due    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 1,018,000 12,371,000
Real Estate | 90 Days or More Past Due | Hospitality    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable   11,076,000
Real Estate | 90 Days or More Past Due | Other    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 458,000 731,000
Real Estate | 90 Days or More Past Due | Total commercial property loans    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 458,000 11,807,000
Real Estate | 90 Days or More Past Due | Residential/Consumer Loans    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 560,000 564,000
Commercial and Industrial    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 12,497,000 12,796,000
Current 575,232,000 744,459,000
Loans receivable 587,729,000 757,255,000
Accruing 90 days or more past due loans receivable 12,446,000  
Commercial and Industrial | 30-59 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 47,000 282,000
Commercial and Industrial | 60-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 4,000 27,000
Commercial and Industrial | 90 Days or More Past Due    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 12,446,000 12,487,000
Leases Receivable    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 6,644,000 10,512,000
Current 424,975,000 412,752,000
Loans receivable 431,619,000 423,264,000
Leases Receivable | 30-59 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 3,664,000 4,051,000
Leases Receivable | 60-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 709,000 1,786,000
Leases Receivable | 90 Days or More Past Due    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable $ 2,271,000 $ 4,675,000