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Loans Receivable - TDRs Subsequently Defaulted (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 USD ($) contract | Dec. 31, 2019 USD ($) contract Contract | Dec. 31, 2018 USD ($) contract
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Related Specific Valuation Allowance |  | $ 2,143 |
Commercial business |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Related Specific Valuation Allowance |  | 1,944 |
Commercial business | Commercial and industrial |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Related Specific Valuation Allowance |  | 1,372 |
Commercial business | Owner-occupied CRE |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Related Specific Valuation Allowance |  | 426 |
Commercial business | Non-owner occupied CRE |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Related Specific Valuation Allowance |  | 146 |
Real estate construction and land development | Residential |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Related Specific Valuation Allowance |  | 0 |
Consumer |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Related Specific Valuation Allowance |  | $ 143 |
Troubled Debt Restructured Loans |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts (1) | contract | 8 | 17 | 8
Recorded Investment | $ 5,316 | $ 14,048 | $ 2,620
Troubled Debt Restructured Loans | Commercial business |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts (1) | contract | 8 | 17 | 6
Recorded Investment | $ 5,316 | $ 14,048 | $ 1,955
Troubled Debt Restructured Loans | Commercial business | Commercial and industrial |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts (1) | contract | 4 | 13 | 5
Recorded Investment | $ 2,136 | $ 12,854 | $ 1,890
Troubled Debt Restructured Loans | Commercial business | Owner-occupied CRE |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts (1) | 2 | 3 | 1
Recorded Investment | $ 1,369 | $ 1,142 | $ 65
Troubled Debt Restructured Loans | Commercial business | Non-owner occupied CRE |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts (1) | contract | 2 | 1 | 0
Recorded Investment | $ 1,811 | $ 52 | $ 0
Troubled Debt Restructured Loans | Real estate construction and land development | Residential |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts (1) | contract | 0 | 0 | 2
Recorded Investment | $ 0 | $ 0 | $ 665
Modified subsequently | Troubled Debt Restructured Loans |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Related Specific Valuation Allowance |  | $ 88 | $ 260

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