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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 ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Financing Receivable, Past Due [Line Items]    
Past due loans receivable $ 11,190 $ 53,640
Loans receivable 4,858,865 4,880,168
Accruing 90 days or more past due loans receivable 13  
30-59 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 6,477 9,026
60-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 1,545 15,081
90 Days or More Past Due    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 3,168 29,533
Current    
Financing Receivable, Past Due [Line Items]    
Loans receivable 4,847,675 4,826,528
Real Estate    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 5,118 30,332
Loans receivable 3,883,366 3,699,649
Real Estate | Retail    
Financing Receivable, Past Due [Line Items]    
Loans receivable 942,996 824,606
Real Estate | Hospitality    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable   11,076
Loans receivable 725,864 859,953
Real Estate | Other    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 2,073 731
Loans receivable 1,783,477 1,610,377
Real Estate | Total commercial property loans    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 2,073 11,807
Loans receivable 3,452,337 3,294,936
Real Estate | Construction    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable   12,807
Loans receivable 76,168 58,882
Real Estate | Residential/Consumer Loans    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 3,045 5,718
Loans receivable 354,861 345,831
Real Estate | 30-59 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 3,586 4,693
Real Estate | 30-59 Days Past Due | Other    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 1,945  
Real Estate | 30-59 Days Past Due | Total commercial property loans    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 1,945  
Real Estate | 30-59 Days Past Due | Residential/Consumer Loans    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 1,641 4,693
Real Estate | 60-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable   13,268
Real Estate | 60-89 Days Past Due | Construction    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable   12,807
Real Estate | 60-89 Days Past Due | Residential/Consumer Loans    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable   461
Real Estate | 90 Days or More Past Due    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 1,532 12,371
Real Estate | 90 Days or More Past Due | Hospitality    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable   11,076
Real Estate | 90 Days or More Past Due | Other    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 128 731
Real Estate | 90 Days or More Past Due | Total commercial property loans    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 128 11,807
Real Estate | 90 Days or More Past Due | Residential/Consumer Loans    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 1,404 564
Real Estate | Current    
Financing Receivable, Past Due [Line Items]    
Loans receivable 3,878,248 3,669,317
Real Estate | Current | Retail    
Financing Receivable, Past Due [Line Items]    
Loans receivable 942,996 824,606
Real Estate | Current | Hospitality    
Financing Receivable, Past Due [Line Items]    
Loans receivable 725,864 848,877
Real Estate | Current | Other    
Financing Receivable, Past Due [Line Items]    
Loans receivable 1,781,404 1,609,646
Real Estate | Current | Total commercial property loans    
Financing Receivable, Past Due [Line Items]    
Loans receivable 3,450,264 3,283,129
Real Estate | Current | Construction    
Financing Receivable, Past Due [Line Items]    
Loans receivable 76,168 46,075
Real Estate | Current | Residential/Consumer Loans    
Financing Receivable, Past Due [Line Items]    
Loans receivable 351,816 340,113
Commercial and Industrial    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 13 12,796
Loans receivable 516,357 757,255
Commercial and Industrial | 30-59 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable   282
Commercial and Industrial | 60-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 13 27
Commercial and Industrial | 90 Days or More Past Due    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable   12,487
Commercial and Industrial | Current    
Financing Receivable, Past Due [Line Items]    
Loans receivable 516,344 744,459
Leases Receivable    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 6,059 10,512
Loans receivable 459,142 423,264
Accruing 90 days or more past due loans receivable 13  
Leases Receivable | 30-59 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 2,891 4,051
Leases Receivable | 60-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 1,532 1,786
Leases Receivable | 90 Days or More Past Due    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 1,636 4,675
Leases Receivable | Current    
Financing Receivable, Past Due [Line Items]    
Loans receivable $ 453,083 $ 412,752