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 ($)
Mar. 31, 2021
Dec. 31, 2020
Financing Receivable, Past Due [Line Items]    
Past due loans receivable $ 33,008,000 $ 53,640,000
Current 4,784,143,000 4,826,528,000
Loans receivable 4,817,151,000 4,880,168,000
Accruing 90 days or more past due loans receivable 0 0
30-59 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 6,748,000 9,026,000
60-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 2,994,000 15,081,000
90 Days or More Past Due    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 23,266,000 29,533,000
Real Estate    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 10,539,000 30,332,000
Current 3,689,977,000 3,669,317,000
Loans receivable 3,700,516,000 3,699,649,000
Real Estate | Retail    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 1,517,000  
Current 810,066,000 824,606,000
Loans receivable 811,583,000 824,606,000
Real Estate | Hospitality    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 5,873,000 11,076,000
Current 836,141,000 848,877,000
Loans receivable 842,014,000 859,953,000
Real Estate | Other    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 1,039,000 731,000
Current 1,655,026,000 1,609,646,000
Loans receivable 1,656,065,000 1,610,377,000
Real Estate | Total commercial property loans    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 8,429,000 11,807,000
Current 3,301,233,000 3,283,129,000
Loans receivable 3,309,662,000 3,294,936,000
Real Estate | Construction    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable   12,807,000
Current 62,626,000 46,075,000
Loans receivable 62,626,000 58,882,000
Real Estate | Residential/Consumer Loans    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 2,110,000 5,718,000
Current 326,118,000 340,113,000
Loans receivable 328,228,000 345,831,000
Real Estate | 30-59 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 3,227,000 4,693,000
Real Estate | 30-59 Days Past Due | Retail    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 1,517,000  
Real Estate | 30-59 Days Past Due | Other    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 162,000  
Real Estate | 30-59 Days Past Due | Total commercial property loans    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 1,679,000  
Real Estate | 30-59 Days Past Due | Residential/Consumer Loans    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 1,548,000 4,693,000
Real Estate | 60-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable   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   461,000
Real Estate | 90 Days or More Past Due    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 7,312,000 12,371,000
Real Estate | 90 Days or More Past Due | Hospitality    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 5,873,000 11,076,000
Real Estate | 90 Days or More Past Due | Other    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 877,000 731,000
Real Estate | 90 Days or More Past Due | Total commercial property loans    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 6,750,000 11,807,000
Real Estate | 90 Days or More Past Due | Residential/Consumer Loans    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 562,000 564,000
Commercial and Industrial    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 13,914,000 12,796,000
Current 693,159,000 744,459,000
Loans receivable 707,073,000 757,255,000
Commercial and Industrial | 30-59 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 119,000 282,000
Commercial and Industrial | 60-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 890,000 27,000
Commercial and Industrial | 90 Days or More Past Due    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 12,905,000 12,487,000
Leases Receivable    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 8,555,000 10,512,000
Current 401,007,000 412,752,000
Loans receivable 409,562,000 423,264,000
Leases Receivable | 30-59 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 3,402,000 4,051,000
Leases Receivable | 60-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 2,104,000 1,786,000
Leases Receivable | 90 Days or More Past Due    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable $ 3,049,000 $ 4,675,000