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 ($)
Sep. 30, 2020
Dec. 31, 2019
Financing Receivable, Past Due [Line Items]    
Past due loans receivable $ 47,927,000 $ 15,652,000
Current 4,786,210,000 4,594,496,000
Total loans receivable 4,834,137,000 4,610,147,000
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 8,270,000 7,497,000
60-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 3,432,000 4,060,000
90 Days or More Past Due    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 36,225,000 4,094,000
Real Estate    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 21,724,000 3,721,000
Current 3,601,912,000 3,624,784,000
Total loans receivable 3,623,635,000 3,628,505,000
Real Estate | Retail    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 1,332,000 249,000
Current 803,723,000 869,053,000
Total loans receivable 805,055,000 869,302,000
Real Estate | Hospitality    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 1,040,000 907,000
Current 876,314,000 921,381,000
Total loans receivable 877,354,000 922,288,000
Real Estate | Other    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 631,000 89,000
Current 1,525,780,000 1,358,344,000
Total loans receivable 1,526,411,000 1,358,432,000
Real Estate | Total commercial property loans    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 3,002,000 1,245,000
Current 3,205,818,000 3,148,778,000
Total loans receivable 3,208,820,000 3,150,022,000
Real Estate | Construction    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 16,636,000  
Current 38,991,000 76,455,000
Total loans receivable 55,627,000 76,455,000
Real Estate | Residential property    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 2,085,000 2,477,000
Current 357,103,000 399,551,000
Total loans receivable 359,188,000 402,028,000
Real Estate | 30-59 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 3,047,000 1,504,000
Real Estate | 30-59 Days Past Due | Retail    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 1,282,000 6,000
Real Estate | 30-59 Days Past Due | Hospitality    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 1,040,000 907,000
Real Estate | 30-59 Days Past Due | Other    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 404,000 51,000
Real Estate | 30-59 Days Past Due | Total commercial property loans    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 2,725,000 964,000
Real Estate | 30-59 Days Past Due | Residential property    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 322,000 540,000
Real Estate | 60-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 519,000 1,759,000
Real Estate | 60-89 Days Past Due | Retail    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 50,000 132,000
Real Estate | 60-89 Days Past Due | Total commercial property loans    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 50,000 132,000
Real Estate | 60-89 Days Past Due | Residential property    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 469,000 1,627,000
Real Estate | 90 Days or More Past Due    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 18,158,000 458,000
Real Estate | 90 Days or More Past Due | Retail    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable   111,000
Real Estate | 90 Days or More Past Due | Other    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 227,000 38,000
Real Estate | 90 Days or More Past Due | Total commercial property loans    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 227,000 149,000
Real Estate | 90 Days or More Past Due | Construction    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 16,636,000  
Real Estate | 90 Days or More Past Due | Residential property    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 1,294,000 309,000
Commercial and Industrial    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 13,134,000 911,000
Current 752,350,000 483,183,000
Total loans receivable 765,484,000 484,093,000
Commercial and Industrial | 30-59 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 170,000 635,000
Commercial and Industrial | 60-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 110,000 133,000
Commercial and Industrial | 90 Days or More Past Due    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 12,854,000 143,000
Leases Receivable    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 13,045,000 10,990,000
Current 420,278,000 472,889,000
Total loans receivable 433,323,000 483,879,000
Leases Receivable | 30-59 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 5,053,000 5,358,000
Leases Receivable | 60-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 2,804,000 2,138,000
Leases Receivable | 90 Days or More Past Due    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 5,188,000 3,493,000
Consumer    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 25,000 30,000
Current 11,670,000 13,639,000
Total loans receivable 11,695,000 13,670,000
Consumer | 60-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable   $ 30,000
Consumer | 90 Days or More Past Due    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable $ 25,000