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Loans Aging of recorded investment in past due loans (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Financing Receivable, Impaired [Line Items] |  |
Financing Receivable, Recorded Investment, Accruing Loans 30 to 89 Days Past Due | $ 23,652 | $ 21,749
Financing Receivable Recorded Investment Ninety Days Or More Past Due And Accruing Plus Past Due Nonaccrual Loans | 26,364 | 26,535
Financing Receivable, Recorded Investment, Past Due | 50,016 | 48,284
Financing Receivable, Not Past Due | 7,148,422 | 6,472,341
Loans and Leases Receivable, Recorded Investment | 7,198,438 | 6,520,625
Financing Receivable, 90 Days or More Past Due, Still Accruing | 1,594 | 2,737
financing receivable non accrual current | 92,600 | 66,300
Commercial Financial And Agricultural [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Financing Receivable, Recorded Investment, Accruing Loans 30 to 89 Days Past Due | 7,372 | 582
Financing Receivable Recorded Investment Ninety Days Or More Past Due And Accruing Plus Past Due Nonaccrual Loans | 13,968 | 12,407
Financing Receivable, Recorded Investment, Past Due | 21,340 | 12,989
Financing Receivable, Not Past Due | 1,574,177 | 1,176,514
Loans and Leases Receivable, Recorded Investment | 1,595,517 | 1,189,503
Financing Receivable, 90 Days or More Past Due, Still Accruing | 0 | 28
Commercial Real Estate Portfolio Segment [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Financing Receivable, Recorded Investment, Accruing Loans 30 to 89 Days Past Due | 82 | 160
Financing Receivable Recorded Investment Ninety Days Or More Past Due And Accruing Plus Past Due Nonaccrual Loans | 972 | 1,143
Financing Receivable, Recorded Investment, Past Due | 1,054 | 1,303
Financing Receivable, Not Past Due | 1,753,152 | 1,613,681
Loans and Leases Receivable, Recorded Investment | 1,754,206 | 1,614,984
Financing Receivable, 90 Days or More Past Due, Still Accruing | 377 | 625
Construction Real Estate Remaining Commercial [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Financing Receivable Recorded Investment Ninety Days Or More Past Due And Accruing Plus Past Due Nonaccrual Loans | 39 |
Financing Receivable, Recorded Investment, Past Due | 39 |
Financing Receivable, Not Past Due | 227,524 | 234,463
Loans and Leases Receivable, Recorded Investment | 227,563 | 234,463
Financing Receivable, 90 Days or More Past Due, Still Accruing | 0 | 0
Construction Real Estate Mortgage [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Financing Receivable, Recorded Investment, Accruing Loans 30 to 89 Days Past Due | 77 | 397
Financing Receivable, Recorded Investment, Past Due | 77 | 397
Financing Receivable, Not Past Due | 115,647 | 96,405
Loans and Leases Receivable, Recorded Investment | 115,724 | 96,802
Financing Receivable, 90 Days or More Past Due, Still Accruing | 0 | 0
Construction Real Estate Installment [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Financing Receivable, Recorded Investment, Accruing Loans 30 to 89 Days Past Due | 12 | 24
Financing Receivable, Recorded Investment, Past Due | 12 | 24
Financing Receivable, Not Past Due | 929 | 1,468
Loans and Leases Receivable, Recorded Investment | 941 | 1,492
Financing Receivable, 90 Days or More Past Due, Still Accruing | 0 | 0
Residential Real Estate Commercial [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Financing Receivable, Recorded Investment, Accruing Loans 30 to 89 Days Past Due | 17 |
Financing Receivable Recorded Investment Ninety Days Or More Past Due And Accruing Plus Past Due Nonaccrual Loans | 493 | 908
Financing Receivable, Recorded Investment, Past Due | 510 | 908
Financing Receivable, Not Past Due | 526,873 | 479,512
Loans and Leases Receivable, Recorded Investment | 527,383 | 480,420
Financing Receivable, 90 Days or More Past Due, Still Accruing | 0 | 0
Residential Real Estate Mortgage [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Financing Receivable, Recorded Investment, Accruing Loans 30 to 89 Days Past Due | 9,538 | 12,841
Financing Receivable Recorded Investment Ninety Days Or More Past Due And Accruing Plus Past Due Nonaccrual Loans | 7,814 | 9,153
Financing Receivable, Recorded Investment, Past Due | 17,352 | 21,994
Financing Receivable, Not Past Due | 1,079,953 | 1,155,703
Loans and Leases Receivable, Recorded Investment | 1,097,305 | 1,177,697
Financing Receivable, 90 Days or More Past Due, Still Accruing | 416 | 1,209
Residential Real Estate Home Equity Line Of Credit [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Financing Receivable, Recorded Investment, Accruing Loans 30 to 89 Days Past Due | 805 | 652
Financing Receivable Recorded Investment Ninety Days Or More Past Due And Accruing Plus Past Due Nonaccrual Loans | 810 | 779
Financing Receivable, Recorded Investment, Past Due | 1,615 | 1,431
Financing Receivable, Not Past Due | 181,060 | 224,448
Loans and Leases Receivable, Recorded Investment | 182,675 | 225,879
Financing Receivable, 90 Days or More Past Due, Still Accruing | 77 | 44
Residential Real Estate Installment [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Financing Receivable, Recorded Investment, Accruing Loans 30 to 89 Days Past Due | 67 | 164
Financing Receivable Recorded Investment Ninety Days Or More Past Due And Accruing Plus Past Due Nonaccrual Loans | 71 | 338
Financing Receivable, Recorded Investment, Past Due | 138 | 502
Financing Receivable, Not Past Due | 8,320 | 12,093
Loans and Leases Receivable, Recorded Investment | 8,458 | 12,595
Financing Receivable, 90 Days or More Past Due, Still Accruing | 0 | 0
Consumer Portfolio Segment [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Financing Receivable, Recorded Investment, Accruing Loans 30 to 89 Days Past Due | 5,496 | 6,561
Financing Receivable Recorded Investment Ninety Days Or More Past Due And Accruing Plus Past Due Nonaccrual Loans | 1,213 | 1,621
Financing Receivable, Recorded Investment, Past Due | 6,709 | 8,182
Financing Receivable, Not Past Due | 1,657,505 | 1,448,507
Loans and Leases Receivable, Recorded Investment | 1,664,214 | 1,456,689
Financing Receivable, 90 Days or More Past Due, Still Accruing | 724 | 645
Leases |  |
Financing Receivable, Impaired [Line Items] |  |
Financing Receivable, Recorded Investment, Accruing Loans 30 to 89 Days Past Due | 186 | 368
Financing Receivable Recorded Investment Ninety Days Or More Past Due And Accruing Plus Past Due Nonaccrual Loans | 984 | 186
Financing Receivable, Recorded Investment, Past Due | 1,170 | 554
Financing Receivable, Not Past Due | 23,282 | 29,547
Loans and Leases Receivable, Recorded Investment | 24,452 | 30,101
Financing Receivable, 90 Days or More Past Due, Still Accruing | $ 0 | $ 186

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