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Allowance for Loan Losses - Activity in Allowance for Losses Disaggregated on Basis of Impairment (Details) - USD ($) $ in Thousands | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Writeoff | $ 187 |  |  |  |
Schedule of allowance for loan losses on the basis of impairment method |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Recovery | 362 |  |  |  |
Allowance for Loan and Lease Losses, Write-offs | (187) | $ (1,597) |  |  |
Allowance for Loan and Lease Loss, Recovery of Bad Debts | 362 | 1,180 |  |  |
Provision for credit losses | (6,135) | 9,964 |  |  |
Allowance for credit losses on loans | 64,225 | 47,540 | $ 70,185 |  | $ 36,171
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |
Schedule of allowance for loan losses on the basis of impairment method |  |  |  |  |
Allowance for credit losses on loans |  |  | 0 |  | 1,822
Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |  |
Schedule of allowance for loan losses on the basis of impairment method |  |  |  |  |
Allowance for credit losses on loans |  |  | 70,185 |  | 37,993
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |
Schedule of allowance for loan losses on the basis of impairment method |  |  |  |  |
Allowance for credit losses on loans |  |  |  |  | 1,822
Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Writeoff | 1 |  |  |  |
Schedule of allowance for loan losses on the basis of impairment method |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Recovery | 207 |  |  |  |
Allowance for Loan and Lease Losses, Write-offs |  | (1,222) |  |  |
Allowance for Loan and Lease Loss, Recovery of Bad Debts |  | 1,069 |  |  |
Provision for credit losses | (4,610) | 7,021 |  |  |
Allowance for credit losses on loans | 45,204 | 27,866 | 49,608 |  | 23,933
Commercial Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |  |
Schedule of allowance for loan losses on the basis of impairment method |  |  |  |  |
Allowance for credit losses on loans |  |  |  | $ 20,998 |
Commercial Portfolio Segment [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |
Schedule of allowance for loan losses on the basis of impairment method |  |  |  |  |
Allowance for credit losses on loans |  |  |  | (2,935) |
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Writeoff | 1 | 1,087 |  |  |
Schedule of allowance for loan losses on the basis of impairment method |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Recovery | 205 | 1,057 |  |  |
Provision for credit losses | (8,444) | 3,539 |  |  |
Allowance for credit losses on loans | 21,770 | 13,900 | 30,010 |  | 11,739
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |  |
Schedule of allowance for loan losses on the basis of impairment method |  |  |  |  |
Allowance for credit losses on loans |  |  |  | 10,391 |
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |
Schedule of allowance for loan losses on the basis of impairment method |  |  |  |  |
Allowance for credit losses on loans |  |  |  | (1,348) |
Commercial Portfolio Segment [Member] | Owner Occupied Commercial Real Estate [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Writeoff | 0 | 135 |  |  |
Schedule of allowance for loan losses on the basis of impairment method |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Recovery | 2 | 12 |  |  |
Provision for credit losses | 976 | 1,375 |  |  |
Allowance for credit losses on loans | 10,464 | 6,216 | 9,486 |  | 4,512
Commercial Portfolio Segment [Member] | Owner Occupied Commercial Real Estate [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |  |
Schedule of allowance for loan losses on the basis of impairment method |  |  |  |  |
Allowance for credit losses on loans |  |  |  | 4,964 |
Commercial Portfolio Segment [Member] | Owner Occupied Commercial Real Estate [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |
Schedule of allowance for loan losses on the basis of impairment method |  |  |  |  |
Allowance for credit losses on loans |  |  |  | 452 |
Commercial Portfolio Segment [Member] | Non Owner Occupied Commercial Real Estate [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Writeoff | 0 | 0 |  |  |
Schedule of allowance for loan losses on the basis of impairment method |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Recovery | 0 | 0 |  |  |
Provision for credit losses | 2,858 | 2,107 |  |  |
Allowance for credit losses on loans | 12,970 | 7,750 | 10,112 |  | 7,682
Commercial Portfolio Segment [Member] | Non Owner Occupied Commercial Real Estate [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |  |
Schedule of allowance for loan losses on the basis of impairment method |  |  |  |  |
Allowance for credit losses on loans |  |  |  | 5,643 |
Commercial Portfolio Segment [Member] | Non Owner Occupied Commercial Real Estate [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |
Schedule of allowance for loan losses on the basis of impairment method |  |  |  |  |
Allowance for credit losses on loans |  |  |  | (2,039) |
Commercial Portfolio Segment [Member] | Paycheck Protection Program |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Writeoff | 0 | 0 |  |  |
Schedule of allowance for loan losses on the basis of impairment method |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Recovery | 0 | 0 |  |  |
Provision for credit losses | 0 | 0 |  |  |
Allowance for credit losses on loans | 0 | 0 | 0 |  | 0
Commercial Portfolio Segment [Member] | Paycheck Protection Program | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |  |
Schedule of allowance for loan losses on the basis of impairment method |  |  |  |  |
Allowance for credit losses on loans |  |  |  | 0 |
Commercial Portfolio Segment [Member] | Paycheck Protection Program | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |
Schedule of allowance for loan losses on the basis of impairment method |  |  |  |  |
Allowance for credit losses on loans |  |  |  | 0 |
Residential Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Writeoff | 0 | 0 |  |  |
Schedule of allowance for loan losses on the basis of impairment method |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Recovery | 0 | 3 |  |  |
Provision for credit losses | (189) | 94 |  |  |
Allowance for credit losses on loans | 1,402 | 3,026 | 1,591 |  | 1,458
Residential Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |  |
Schedule of allowance for loan losses on the basis of impairment method |  |  |  |  |
Allowance for credit losses on loans |  |  |  | 2,929 |
Residential Portfolio Segment [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |
Schedule of allowance for loan losses on the basis of impairment method |  |  |  |  |
Allowance for credit losses on loans |  |  |  | $ 1,471 |
Real Estate Construction and Land Development |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Writeoff | 1 |  |  |  |
Schedule of allowance for loan losses on the basis of impairment method |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Recovery | 16 |  |  |  |
Allowance for Loan and Lease Losses, Write-offs |  | 0 |  |  |
Allowance for Loan and Lease Loss, Recovery of Bad Debts |  | 14 |  |  |
Provision for credit losses | 164 | 2,565 |  |  |
Allowance for credit losses on loans | 13,271 | 12,308 | 13,092 |  | 3,060
Real Estate Construction and Land Development | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |  |
Schedule of allowance for loan losses on the basis of impairment method |  |  |  |  |
Allowance for credit losses on loans |  |  |  |  | 9,729
Real Estate Construction and Land Development | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |
Schedule of allowance for loan losses on the basis of impairment method |  |  |  |  |
Allowance for credit losses on loans |  |  |  |  | 6,669
Real Estate Construction and Land Development | One-to-four Family Real Estate Construction |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Writeoff | 0 | 0 |  |  |
Schedule of allowance for loan losses on the basis of impairment method |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Recovery | 16 | 14 |  |  |
Provision for credit losses | 81 | (34) |  |  |
Allowance for credit losses on loans | 2,048 | 864 | 1,951 |  | 1,455
Real Estate Construction and Land Development | One-to-four Family Real Estate Construction | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |  |
Schedule of allowance for loan losses on the basis of impairment method |  |  |  |  |
Allowance for credit losses on loans |  |  |  |  | 884
Real Estate Construction and Land Development | One-to-four Family Real Estate Construction | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |
Schedule of allowance for loan losses on the basis of impairment method |  |  |  |  |
Allowance for credit losses on loans |  |  |  |  | (571)
Real Estate Construction and Land Development | Five or More Family Residential and Commercial Properties [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Writeoff | 1 | 0 |  |  |
Schedule of allowance for loan losses on the basis of impairment method |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Recovery | 0 | 0 |  |  |
Provision for credit losses | 83 | 2,599 |  |  |
Allowance for credit losses on loans | 11,223 | 11,444 | 11,141 |  | 1,605
Real Estate Construction and Land Development | Five or More Family Residential and Commercial Properties [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |  |
Schedule of allowance for loan losses on the basis of impairment method |  |  |  |  |
Allowance for credit losses on loans |  |  |  |  | 8,845
Real Estate Construction and Land Development | Five or More Family Residential and Commercial Properties [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |
Schedule of allowance for loan losses on the basis of impairment method |  |  |  |  |
Allowance for credit losses on loans |  |  |  |  | 7,240
Consumer Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Writeoff | 185 | 375 |  |  |
Schedule of allowance for loan losses on the basis of impairment method |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Recovery | 139 | 94 |  |  |
Provision for credit losses | (1,500) | 284 |  |  |
Allowance for credit losses on loans | $ 4,348 | 4,340 | $ 5,894 |  | 6,821
Consumer Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |  |
Schedule of allowance for loan losses on the basis of impairment method |  |  |  |  |
Allowance for credit losses on loans |  |  |  |  | 4,337
Consumer Portfolio Segment [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |
Schedule of allowance for loan losses on the basis of impairment method |  |  |  |  |
Allowance for credit losses on loans |  |  |  |  | (2,484)
Unallocated |  |  |  |  |
Schedule of allowance for loan losses on the basis of impairment method |  |  |  |  |
Allowance for Loan and Lease Losses, Write-offs |  | 0 |  |  |
Allowance for Loan and Lease Loss, Recovery of Bad Debts |  | 0 |  |  |
Provision for credit losses |  | 0 |  |  |
Allowance for credit losses on loans |  | $ 0 |  |  | 899
Unallocated | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |  |
Schedule of allowance for loan losses on the basis of impairment method |  |  |  |  |
Allowance for credit losses on loans |  |  |  |  | 0
Unallocated | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |
Schedule of allowance for loan losses on the basis of impairment method |  |  |  |  |
Allowance for credit losses on loans |  |  |  |  | $ (899)

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