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, 2020
Dec. 31, 2019
Financing Receivable, Past Due [Line Items]    
Past due loans receivable $ 33,736,000 $ 15,652,000
Current 4,791,906,000 4,594,496,000
Total loans receivable 4,825,642,000 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 6,578,000 7,497,000
60-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 5,095,000 4,060,000
90 Days or More Past Due    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 22,062,000 4,094,000
Real Estate    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 6,972,000 3,721,000
Current 3,613,334,000 3,624,784,000
Total loans receivable 3,620,306,000 3,628,505,000
Real Estate | Retail    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable   249,000
Current 808,157,000 869,053,000
Total loans receivable 808,157,000 869,302,000
Real Estate | Hospitality    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable   907,000
Current 882,812,000 921,381,000
Total loans receivable 882,812,000 922,288,000
Real Estate | Other    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 1,645,000 89,000
Current 1,503,271,000 1,358,344,000
Total loans receivable 1,504,916,000 1,358,432,000
Real Estate | Total commercial property loans    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 1,645,000 1,245,000
Current 3,194,240,000 3,148,778,000
Total loans receivable 3,195,885,000 3,150,022,000
Real Estate | Construction    
Financing Receivable, Past Due [Line Items]    
Current 70,357,000 76,455,000
Total loans receivable 70,357,000 76,455,000
Real Estate | Residential property    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 5,327,000 2,477,000
Current 348,737,000 399,551,000
Total loans receivable 354,064,000 402,028,000
Real Estate | 30-59 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 2,682,000 1,504,000
Real Estate | 30-59 Days Past Due | Retail    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable   6,000
Real Estate | 30-59 Days Past Due | Hospitality    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable   907,000
Real Estate | 30-59 Days Past Due | Other    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable   51,000
Real Estate | 30-59 Days Past Due | Total commercial property loans    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable   964,000
Real Estate | 30-59 Days Past Due | Residential property    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 2,682,000 540,000
Real Estate | 60-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable   1,759,000
Real Estate | 60-89 Days Past Due | Retail    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable   132,000
Real Estate | 60-89 Days Past Due | Total commercial property loans    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable   132,000
Real Estate | 60-89 Days Past Due | Residential property    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable   1,627,000
Real Estate | 90 Days or More Past Due    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 4,290,000 458,000
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 1,645,000 38,000
Real Estate | 90 Days or More Past Due | Total commercial property loans    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 1,645,000 149,000
Real Estate | 90 Days or More Past Due | Residential property    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 2,645,000 309,000
Commercial and Industrial    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 12,844,000 911,000
Current 717,555,000 483,183,000
Total loans receivable 730,399,000 484,093,000
Commercial and Industrial | 30-59 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 212,000 635,000
Commercial and Industrial | 60-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable   133,000
Commercial and Industrial | 90 Days or More Past Due    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 12,632,000 143,000
Leases Receivable    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 13,893,000 10,990,000
Current 448,918,000 472,889,000
Total loans receivable 462,811,000 483,879,000
Leases Receivable | 30-59 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 3,684,000 5,358,000
Leases Receivable | 60-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 5,095,000 2,138,000
Leases Receivable | 90 Days or More Past Due    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 5,113,000 3,493,000
Consumer    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 27,000 30,000
Current 12,099,000 13,639,000
Total loans receivable 12,126,000 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 $ 27,000