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Summary of Significant Accounting Policies - Summary of Impact of ASU on Allowance for Credit Losses (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019
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New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Total allowance for credit losses on loans receivable | $ 90,426 |  | $ 61,408
ASU 2016-13 |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Total allowance for credit losses on loans receivable |  | $ 78,841 |
Allowance for credit losses on off-balance sheet items |  | 2,062 |
ASU 2016-13 | Pre-ASU 2016-13 Adoption |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Total allowance for credit losses on loans receivable |  | 61,408 |
Allowance for credit losses on off-balance sheet items |  | 2,398 |
ASU 2016-13 | Impact of ASU 2016-13 Adoption |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Total allowance for credit losses on loans receivable |  | 17,432 |
Allowance for credit losses on off-balance sheet items |  | (335) |
Real Estate |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Total allowance for credit losses on loans receivable | 51,876 |  | 36,435
Real Estate | Retail |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Total allowance for credit losses on loans receivable | 4,855 |  | 4,911
Real Estate | Hospitality |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Total allowance for credit losses on loans receivable | 28,801 |  | 6,686
Real Estate | Other |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Total allowance for credit losses on loans receivable | 13,991 |  | 8,060
Real Estate | Total commercial property loans |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Total allowance for credit losses on loans receivable | 47,647 |  | 19,657
Real Estate | Construction |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Total allowance for credit losses on loans receivable | 2,876 |  | 15,003
Real Estate | Residential/Consumer Loans |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Total allowance for credit losses on loans receivable | 1,353 |  | 1,775
Real Estate | ASU 2016-13 |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Total allowance for credit losses on loans receivable |  | 50,463 |
Real Estate | ASU 2016-13 | Pre-ASU 2016-13 Adoption |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Total allowance for credit losses on loans receivable |  | 36,435 |
Real Estate | ASU 2016-13 | Impact of ASU 2016-13 Adoption |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Total allowance for credit losses on loans receivable |  | 14,027 |
Real Estate | ASU 2016-13 | Retail |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Total allowance for credit losses on loans receivable |  | 6,785 |
Real Estate | ASU 2016-13 | Retail | Pre-ASU 2016-13 Adoption |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Total allowance for credit losses on loans receivable |  | 4,911 |
Real Estate | ASU 2016-13 | Retail | Impact of ASU 2016-13 Adoption |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Total allowance for credit losses on loans receivable |  | 1,873 |
Real Estate | ASU 2016-13 | Hospitality |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Total allowance for credit losses on loans receivable |  | 12,387 |
Real Estate | ASU 2016-13 | Hospitality | Pre-ASU 2016-13 Adoption |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Total allowance for credit losses on loans receivable |  | 6,686 |
Real Estate | ASU 2016-13 | Hospitality | Impact of ASU 2016-13 Adoption |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Total allowance for credit losses on loans receivable |  | 5,702 |
Real Estate | ASU 2016-13 | Other |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Total allowance for credit losses on loans receivable |  | 13,415 |
Real Estate | ASU 2016-13 | Other | Pre-ASU 2016-13 Adoption |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Total allowance for credit losses on loans receivable |  | 8,060 |
Real Estate | ASU 2016-13 | Other | Impact of ASU 2016-13 Adoption |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Total allowance for credit losses on loans receivable |  | 5,355 |
Real Estate | ASU 2016-13 | Total commercial property loans |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Total allowance for credit losses on loans receivable |  | 32,587 |
Real Estate | ASU 2016-13 | Total commercial property loans | Pre-ASU 2016-13 Adoption |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Total allowance for credit losses on loans receivable |  | 19,657 |
Real Estate | ASU 2016-13 | Total commercial property loans | Impact of ASU 2016-13 Adoption |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Total allowance for credit losses on loans receivable |  | 12,930 |
Real Estate | ASU 2016-13 | Construction |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Total allowance for credit losses on loans receivable |  | 15,590 |
Real Estate | ASU 2016-13 | Construction | Pre-ASU 2016-13 Adoption |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Total allowance for credit losses on loans receivable |  | 15,003 |
Real Estate | ASU 2016-13 | Construction | Impact of ASU 2016-13 Adoption |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Total allowance for credit losses on loans receivable |  | 587 |
Real Estate | ASU 2016-13 | Residential/Consumer Loans |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Total allowance for credit losses on loans receivable |  | 2,286 |
Real Estate | ASU 2016-13 | Residential/Consumer Loans | Pre-ASU 2016-13 Adoption |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Total allowance for credit losses on loans receivable |  | 1,775 |
Real Estate | ASU 2016-13 | Residential/Consumer Loans | Impact of ASU 2016-13 Adoption |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Total allowance for credit losses on loans receivable |  | 510 |
Commercial and Industrial |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Total allowance for credit losses on loans receivable | 21,410 |  | 16,206
Commercial and Industrial | ASU 2016-13 |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Total allowance for credit losses on loans receivable |  | 13,709 |
Commercial and Industrial | ASU 2016-13 | Pre-ASU 2016-13 Adoption |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Total allowance for credit losses on loans receivable |  | 16,206 |
Commercial and Industrial | ASU 2016-13 | Impact of ASU 2016-13 Adoption |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Total allowance for credit losses on loans receivable |  | (2,497) |
Commercial and Industrial | ASU 2016-13 | Commercial term |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Total allowance for credit losses on loans receivable |  | 12,175 |
Commercial and Industrial | ASU 2016-13 | Commercial term | Pre-ASU 2016-13 Adoption |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Total allowance for credit losses on loans receivable |  | 14,077 |
Commercial and Industrial | ASU 2016-13 | Commercial term | Impact of ASU 2016-13 Adoption |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Total allowance for credit losses on loans receivable |  | (1,903) |
Commercial and Industrial | ASU 2016-13 | Commercial lines of credit |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Total allowance for credit losses on loans receivable |  | 1,358 |
Commercial and Industrial | ASU 2016-13 | Commercial lines of credit | Pre-ASU 2016-13 Adoption |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Total allowance for credit losses on loans receivable |  | 1,887 |
Commercial and Industrial | ASU 2016-13 | Commercial lines of credit | Impact of ASU 2016-13 Adoption |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Total allowance for credit losses on loans receivable |  | (529) |
Commercial and Industrial | ASU 2016-13 | International loans |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Total allowance for credit losses on loans receivable |  | 176 |
Commercial and Industrial | ASU 2016-13 | International loans | Pre-ASU 2016-13 Adoption |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Total allowance for credit losses on loans receivable |  | 242 |
Commercial and Industrial | ASU 2016-13 | International loans | Impact of ASU 2016-13 Adoption |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Total allowance for credit losses on loans receivable |  | (65) |
Leases Receivable |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Total allowance for credit losses on loans receivable | $ 17,140 |  | $ 8,767
Leases Receivable | ASU 2016-13 |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Total allowance for credit losses on loans receivable |  | 14,669 |
Leases Receivable | ASU 2016-13 | Pre-ASU 2016-13 Adoption |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Total allowance for credit losses on loans receivable |  | 8,767 |
Leases Receivable | ASU 2016-13 | Impact of ASU 2016-13 Adoption |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Total allowance for credit losses on loans receivable |  | $ 5,902 |

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