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Allowance for Loan Losses Activity in the allowance for loan losses (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for loan losses | $ 85,675 | $ 56,679 | $ 51,512 | $ 49,988
Financing Receivable, Allowance for Credit Losses, Write-downs | 10,304 | 11,177 | 13,552 |
Financing Receivable, Allowance for Credit Losses, Recovery | 27,246 | 10,173 | 7,131 |
Financing Receivables Allowance For Credit Losses Net Charge Offs | (16,942) | 1,004 | 6,421 |
Provision for Loan, Lease, and Other Losses | 12,054 | 6,171 | 7,945 |
Commercial Financial And Agricultural [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for loan losses | 25,608 | 20,203 | 16,777 | 15,022
Financing Receivable, Allowance for Credit Losses, Write-downs | 1,468 | 2,231 | 2,796 |
Financing Receivable, Allowance for Credit Losses, Recovery | 20,765 | 1,241 | 1,221 |
Financing Receivables Allowance For Credit Losses Net Charge Offs | (19,297) | 990 | 1,575 |
Provision for Loan, Lease, and Other Losses | (13,892) | 4,416 | 3,330 |
Commercial Real Estate Portfolio Segment [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for loan losses | 23,480 | 10,229 | 9,768 | 9,601
Financing Receivable, Allowance for Credit Losses, Write-downs | 1,824 | 400 | 281 |
Financing Receivable, Allowance for Credit Losses, Recovery | 738 | 720 | 272 |
Financing Receivables Allowance For Credit Losses Net Charge Offs | 1,086 | (320) | 9 |
Provision for Loan, Lease, and Other Losses | 14,337 | 141 | 176 |
Construction Real Estate [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for loan losses | 7,288 | 5,311 | 4,463 | 4,430
Financing Receivable, Allowance for Credit Losses, Write-downs | 6 | 0 | 72 |
Financing Receivable, Allowance for Credit Losses, Recovery | 1,122 | 2,682 | 712 |
Financing Receivables Allowance For Credit Losses Net Charge Offs | (1,116) | (2,682) | (640) |
Provision for Loan, Lease, and Other Losses | 861 | (1,834) | (607) |
Residential Portfolio Segment [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for loan losses | 11,363 | 8,610 | 8,731 | 9,321
Financing Receivable, Allowance for Credit Losses, Write-downs | 356 | 239 | 441 |
Financing Receivable, Allowance for Credit Losses, Recovery | 991 | 787 | 844 |
Financing Receivables Allowance For Credit Losses Net Charge Offs | (635) | (548) | (403) |
Provision for Loan, Lease, and Other Losses | 2,118 | (669) | (993) |
Consumer Portfolio Segment [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for loan losses | 17,418 | 12,211 | 11,773 | 11,614
Financing Receivable, Allowance for Credit Losses, Write-downs | 6,634 | 8,307 | 9,962 |
Financing Receivable, Allowance for Credit Losses, Recovery | 3,629 | 4,742 | 4,078 |
Financing Receivables Allowance For Credit Losses Net Charge Offs | 3,005 | 3,565 | 5,884 |
Provision for Loan, Lease, and Other Losses | 8,212 | 4,003 | 6,043 |
Leases |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for loan losses | 518 | 115 | 0 | $ 0
Financing Receivable, Allowance for Credit Losses, Write-downs | 16 | 0 | 0 |
Financing Receivable, Allowance for Credit Losses, Recovery | 1 | 1 | 4 |
Financing Receivables Allowance For Credit Losses Net Charge Offs | 15 | (1) | (4) |
Provision for Loan, Lease, and Other Losses | $ 418 | $ 114 | $ (4) |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of increase in allowance for credit loss on financing receivable from recovery. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=121647567&loc=SL82922352-210448 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 + Details
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- Definition Amount of writeoff of financing receivable, charged against allowance for credit loss. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=121647567&loc=SL82922352-210448 + Details
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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=121614798&loc=d3e15032-111544 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.1) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707 + Details
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