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Loans - Schedule of composition of loan portfolio (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Financing Receivable, Impaired [Line Items] |  |
Loans and Leases Receivable, Net of Deferred Income | $ 6,501,404 | $ 5,692,132
Interest Receivable | 19,221 | 17,666
Loans and Leases Receivable, Recorded Investment | 6,520,625 | 5,709,798
Commercial Financial And Agricultural [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Loans and Leases Receivable, Net of Deferred Income | 1,185,110 | 1,072,786
Interest Receivable | 4,393 | 4,603
Loans and Leases Receivable, Recorded Investment | 1,189,503 | 1,077,389
Commercial Real Estate Portfolio Segment [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Loans and Leases Receivable, Net of Deferred Income | 1,609,413 | 1,283,045
Interest Receivable | 5,571 | 4,750
Loans and Leases Receivable, Recorded Investment | 1,614,984 | 1,287,795
Construction Real Estate Remaining Commercial [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Loans and Leases Receivable, Net of Deferred Income | 233,637 | 175,300
Interest Receivable | 826 | 801
Loans and Leases Receivable, Recorded Investment | 234,463 | 176,101
Construction Real Estate Mortgage [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Loans and Leases Receivable, Net of Deferred Income | 96,574 | 70,541
Interest Receivable | 228 | 151
Loans and Leases Receivable, Recorded Investment | 96,802 | 70,692
Construction Real Estate Installment [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Loans and Leases Receivable, Net of Deferred Income | 1,488 | 2,433
Interest Receivable | 4 | 7
Loans and Leases Receivable, Recorded Investment | 1,492 | 2,440
Residential Real Estate Commercial [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Loans and Leases Receivable, Net of Deferred Income | 479,081 | 429,730
Interest Receivable | 1,339 | 1,150
Loans and Leases Receivable, Recorded Investment | 480,420 | 430,880
Residential Real Estate Mortgage [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Loans and Leases Receivable, Net of Deferred Income | 1,176,316 | 1,134,278
Interest Receivable | 1,381 | 1,227
Loans and Leases Receivable, Recorded Investment | 1,177,697 | 1,135,505
Residential Real Estate Home Equity Line Of Credit [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Loans and Leases Receivable, Net of Deferred Income | 224,766 | 215,283
Interest Receivable | 1,113 | 1,159
Loans and Leases Receivable, Recorded Investment | 225,879 | 216,442
Residential Real Estate Installment [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Loans and Leases Receivable, Net of Deferred Income | 12,563 | 14,327
Interest Receivable | 32 | 36
Loans and Leases Receivable, Recorded Investment | 12,595 | 14,363
Consumer Portfolio Segment [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Loans and Leases Receivable, Net of Deferred Income | 1,452,375 | 1,292,136
Interest Receivable | 4,314 | 3,756
Loans and Leases Receivable, Recorded Investment | 1,456,689 | 1,295,892
Leases |  |
Financing Receivable, Impaired [Line Items] |  |
Loans and Leases Receivable, Net of Deferred Income | 30,081 | 2,273
Interest Receivable | 20 | 26
Loans and Leases Receivable, Recorded Investment | $ 30,101 | $ 2,299

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