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, 2020
Dec. 31, 2019
Financing Receivable, Past Due [Line Items]    
Total loans receivable $ 4,543,636,000 $ 4,610,147,000
Accruing 90 days or more past due loans receivable 5,843,000 0
Non-PCI Loans    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 29,542,000 15,652,000
Current 4,514,094,000 4,594,496,000
Total loans receivable 4,543,636,000 4,610,147,000
Accruing 90 days or more past due loans receivable 5,843,000  
Non-PCI Loans | 30-59 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 8,899,000 7,497,000
Non-PCI Loans | 60-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 4,146,000 4,060,000
Non-PCI Loans | 90 Days or More Past Due    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 16,497,000 4,094,000
Real Estate    
Financing Receivable, Past Due [Line Items]    
Total loans receivable 3,566,305,000 3,628,505,000
Real Estate | Retail    
Financing Receivable, Past Due [Line Items]    
Total loans receivable 818,045,000 869,302,000
Real Estate | Hospitality    
Financing Receivable, Past Due [Line Items]    
Total loans receivable 884,511,000 922,288,000
Real Estate | Other    
Financing Receivable, Past Due [Line Items]    
Total loans receivable 1,420,824,000 1,358,432,000
Real Estate | Total commercial property loans    
Financing Receivable, Past Due [Line Items]    
Total loans receivable 3,123,380,000 3,150,022,000
Real Estate | Construction    
Financing Receivable, Past Due [Line Items]    
Total loans receivable 63,809,000 76,455,000
Real Estate | Residential property    
Financing Receivable, Past Due [Line Items]    
Total loans receivable 379,116,000 402,028,000
Real Estate | Non-PCI Loans    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 6,515,000 3,721,000
Current 3,559,790,000 3,624,784,000
Total loans receivable 3,566,306,000 3,628,505,000
Real Estate | Non-PCI Loans | Retail    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable   249,000
Current 818,045,000 869,053,000
Total loans receivable 818,045,000 869,302,000
Real Estate | Non-PCI Loans | Hospitality    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable   907,000
Current 884,511,000 921,381,000
Total loans receivable 884,511,000 922,288,000
Real Estate | Non-PCI Loans | Other    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 3,227,000 89,000
Current 1,417,597,000 1,358,344,000
Total loans receivable 1,420,824,000 1,358,432,000
Real Estate | Non-PCI Loans | Total commercial property loans    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 3,227,000 1,245,000
Current 3,120,153,000 3,148,778,000
Total loans receivable 3,123,380,000 3,150,022,000
Real Estate | Non-PCI Loans | Construction    
Financing Receivable, Past Due [Line Items]    
Current 63,809,000 76,455,000
Total loans receivable 63,809,000 76,455,000
Real Estate | Non-PCI Loans | Residential property    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 3,288,000 2,477,000
Current 375,828,000 399,551,000
Total loans receivable 379,116,000 402,028,000
Real Estate | Non-PCI Loans | 30-59 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 1,239,000 1,504,000
Real Estate | Non-PCI Loans | 30-59 Days Past Due | Retail    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable   6,000
Real Estate | Non-PCI Loans | 30-59 Days Past Due | Hospitality    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable   907,000
Real Estate | Non-PCI Loans | 30-59 Days Past Due | Other    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 708,000 51,000
Real Estate | Non-PCI Loans | 30-59 Days Past Due | Total commercial property loans    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 708,000 964,000
Real Estate | Non-PCI Loans | 30-59 Days Past Due | Residential property    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 531,000 540,000
Real Estate | Non-PCI Loans | 60-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 2,011,000 1,759,000
Real Estate | Non-PCI Loans | 60-89 Days Past Due | Retail    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable   132,000
Real Estate | Non-PCI Loans | 60-89 Days Past Due | Other    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 1,418,000  
Real Estate | Non-PCI Loans | 60-89 Days Past Due | Total commercial property loans    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 1,418,000 132,000
Real Estate | Non-PCI Loans | 60-89 Days Past Due | Residential property    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 593,000 1,627,000
Real Estate | Non-PCI Loans | 90 Days or More Past Due    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 3,265,000 458,000
Real Estate | Non-PCI Loans | 90 Days or More Past Due | Retail    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable   111,000
Real Estate | Non-PCI Loans | 90 Days or More Past Due | Other    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 1,101,000 38,000
Real Estate | Non-PCI Loans | 90 Days or More Past Due | Total commercial property loans    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 1,101,000 149,000
Real Estate | Non-PCI Loans | 90 Days or More Past Due | Residential property    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 2,164,000 309,000
Commercial and Industrial    
Financing Receivable, Past Due [Line Items]    
Total loans receivable 472,714,000 484,093,000
Commercial and Industrial | Non-PCI Loans    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 10,151,000 911,000
Current 462,563,000 483,183,000
Total loans receivable 472,714,000 484,093,000
Accruing 90 days or more past due loans receivable 5,520,000  
Commercial and Industrial | Non-PCI Loans | 30-59 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 349,000 635,000
Commercial and Industrial | Non-PCI Loans | 60-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 318,000 133,000
Commercial and Industrial | Non-PCI Loans | 90 Days or More Past Due    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 9,484,000 143,000
Leases Receivable    
Financing Receivable, Past Due [Line Items]    
Total loans receivable 492,527,000 483,879,000
Leases Receivable | Non-PCI Loans    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 12,848,000 10,990,000
Current 479,679,000 472,889,000
Total loans receivable 492,527,000 483,879,000
Accruing 90 days or more past due loans receivable 323,000  
Leases Receivable | Non-PCI Loans | 30-59 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 7,311,000 5,358,000
Leases Receivable | Non-PCI Loans | 60-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 1,789,000 2,138,000
Leases Receivable | Non-PCI Loans | 90 Days or More Past Due    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 3,748,000 3,493,000
Consumer    
Financing Receivable, Past Due [Line Items]    
Total loans receivable 12,090,000 13,670,000
Consumer | Non-PCI Loans    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable 28,000 30,000
Current 12,062,000 13,639,000
Total loans receivable 12,090,000 13,670,000
Consumer | Non-PCI Loans | 60-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable $ 28,000 $ 30,000