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Loans - Schedule of composition of loan portfolio (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Financing Receivable, Impaired [Line Items] |  |
Loans and Leases Receivable, Net of Deferred Income | $ 7,177,785 | $ 6,501,404
Interest Receivable | 20,653 | 19,221
Loans and Leases Receivable, Recorded Investment | 7,198,438 | 6,520,625
Commercial Financial And Agricultural [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Loans and Leases Receivable, Net of Deferred Income | 1,588,989 | 1,185,110
Interest Receivable | 6,528 | 4,393
Loans and Leases Receivable, Recorded Investment | 1,595,517 | 1,189,503
Commercial Real Estate Portfolio Segment [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Loans and Leases Receivable, Net of Deferred Income | 1,748,189 | 1,609,413
Interest Receivable | 6,017 | 5,571
Loans and Leases Receivable, Recorded Investment | 1,754,206 | 1,614,984
Construction Real Estate Remaining Commercial [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Loans and Leases Receivable, Net of Deferred Income | 226,991 | 233,637
Interest Receivable | 572 | 826
Loans and Leases Receivable, Recorded Investment | 227,563 | 234,463
Construction Real Estate Mortgage [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Loans and Leases Receivable, Net of Deferred Income | 115,492 | 96,574
Interest Receivable | 232 | 228
Loans and Leases Receivable, Recorded Investment | 115,724 | 96,802
Construction Real Estate Installment [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Loans and Leases Receivable, Net of Deferred Income | 938 | 1,488
Interest Receivable | 3 | 4
Loans and Leases Receivable, Recorded Investment | 941 | 1,492
Residential Real Estate Commercial [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Loans and Leases Receivable, Net of Deferred Income | 526,222 | 479,081
Interest Receivable | 1,161 | 1,339
Loans and Leases Receivable, Recorded Investment | 527,383 | 480,420
Residential Real Estate Mortgage [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Loans and Leases Receivable, Net of Deferred Income | 1,096,358 | 1,176,316
Interest Receivable | 947 | 1,381
Loans and Leases Receivable, Recorded Investment | 1,097,305 | 1,177,697
Residential Real Estate Home Equity Line Of Credit [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Loans and Leases Receivable, Net of Deferred Income | 182,028 | 224,766
Interest Receivable | 647 | 1,113
Loans and Leases Receivable, Recorded Investment | 182,675 | 225,879
Residential Real Estate Installment [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Loans and Leases Receivable, Net of Deferred Income | 8,436 | 12,563
Interest Receivable | 22 | 32
Loans and Leases Receivable, Recorded Investment | 8,458 | 12,595
Consumer Portfolio Segment [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Loans and Leases Receivable, Net of Deferred Income | 1,659,704 | 1,452,375
Interest Receivable | 4,510 | 4,314
Loans and Leases Receivable, Recorded Investment | 1,664,214 | 1,456,689
Leases |  |
Financing Receivable, Impaired [Line Items] |  |
Loans and Leases Receivable, Net of Deferred Income | 24,438 | 30,081
Interest Receivable | 14 | 20
Loans and Leases Receivable, Recorded Investment | $ 24,452 | $ 30,101

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