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Allowance for Credit Losses on Loans - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Allowance for Loan and Lease Losses Write-offs, Net |  |  |  |  | $ (3,200) |  |
Financing Receivable Allowance for Credit Losses Recovery Details |  |  |  |  | 963 |  |
Provision for credit losses | $ 1,558 | $ 466 | $ 1,367 | $ 920 | 35,433 | $ 4,311 | $ 5,129
Commercial business |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Provision for credit losses |  |  |  |  | 30,831 | 2,257 | 2,204
Commercial business | Commercial and industrial |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses WriteOff Details |  |  |  |  | 1,700 |  |
Financing Receivable, Allowance for Credit Loss, Writeoff Net |  |  |  |  | 447 |  |
Provision for credit losses |  |  |  |  | 21,722 | 2,922 | 1,782
Real estate construction and land development |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Provision for credit losses |  |  |  |  | 3,502 | 362 | 131
Real estate construction and land development | Commercial and multifamily |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Writeoff Net |  |  |  |  | 417 |  |
Provision for credit losses |  |  |  |  | 2,713 | 651 | (236)
Consumer |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Allowance for Loan and Lease Losses Write-offs, Net |  |  |  |  | (884) |  |
Provision for credit losses |  |  |  |  | $ 2,441 | $ 1,831 | $ 2,147

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