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Summary of Significant Accounting Policies - Narrative (Details) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 USD ($) loan store borrower | Dec. 31, 2019 USD ($) loan | Jan. 01, 2020 USD ($) | Dec. 31, 2018 USD ($)
Property, Plant and Equipment [Line Items] |  |  |  |
Number of loans modified in TDR | loan | 2 | 1 |  |
Short-term loan modification program, number of loans | loan | 36 |  |  |
Short-term loan modification program, outstanding exposure | $ 72,000,000 |  |  |
Short-term loan modification program, outstanding exposure percentage | 0.90% |  |  |
Net loans | $ 7,650,633,000 | $ 7,472,090,000 |  |
Intangible assets | 0 | 0 |  |
Unamortized multifamily FHA MSR's | $ 807,000 | 310,000 |  |
Reasonable and Supportable period (in years) | 2 years |  |  |
Historical loss rate period | 12 months |  |  |
Allowance for credit loss | $ 167,000 |  |  |
Less: allowance for credit losses | (109,579,000) | (73,658,000) | $ (73,658,000) | $ (69,944,000)
Liabilities: Reserve for Unfunded Commitments | (5,498,000) | $ 0 | 0 |
Impact of ASC 326 Adoption | Accounting Standards Update 2016-13 |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Less: allowance for credit losses |  |  | 10,600,000 |
Liabilities: Reserve for Unfunded Commitments |  |  | $ 4,100,000 |
PPP loans |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Net loans | $ 454,800,000 |  |  |
Number of borrowers (over) | borrower | 1,400 |  |  |
90 days or more past due |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Number of loans modified in TDR | loan | 0 |  |  |
Minimum |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Days from commitment to closing | 30 days |  |  |
Maximum |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Days from commitment to closing | 90 days |  |  |
Furniture Fixtures and Equipment | Minimum |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property, plant and equipment, useful life | 3 years |  |  |
Furniture Fixtures and Equipment | Maximum |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property, plant and equipment, useful life | 7 years |  |  |
Computer Software and Hardware | Minimum |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property, plant and equipment, useful life | 3 years |  |  |
Computer Software and Hardware | Maximum |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property, plant and equipment, useful life | 5 years |  |  |
Building Improvements | Minimum |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property, plant and equipment, useful life | 5 years |  |  |
Building Improvements | Maximum |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property, plant and equipment, useful life | 20 years |  |  |
Banking Services |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Number of stores | store | 20 |  |  |
Lending Services |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Number of stores | store | 6 |  |  |

X
- Definition Period for application of the historical rate on straight line basis, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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