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Loans - Aging of Recorded Investment in Past Due Loans (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Accruing loans past due 30-89 days |  | $ 29,919 |  | $ 25,241 |
Past due, nonaccrual loans and loans past due 90 days or more and accruing (1) |  | 19,602 | [1] | 17,776 | [2]
Total past due |  | 49,521 |  | 43,017 |
Total current (2) |  | 5,660,277 |  | 5,346,125 |
Recorded Investment |  | 5,709,798 |  | 5,389,142 |
Installment |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Accruing loans past due 30-89 days |  | 155 |  | 239 |
Past due, nonaccrual loans and loans past due 90 days or more and accruing (1) |  | 274 | [1] | 253 | [2]
Total past due |  | 429 |  | 492 |
Total current (2) |  | 13,934 |  | 18,087 |
Recorded Investment |  | 14,363 |  | 18,579 |
HELOC |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Accruing loans past due 30-89 days |  | 620 |  | 616 |
Past due, nonaccrual loans and loans past due 90 days or more and accruing (1) |  | 907 | [1] | 876 | [2]
Total past due |  | 1,527 |  | 1,492 |
Total current (2) |  | 214,915 |  | 202,660 |
Recorded Investment |  | 216,442 |  | 204,152 |
Mortgage |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Accruing loans past due 30-89 days |  | 13,210 |  | 11,515 |
Past due, nonaccrual loans and loans past due 90 days or more and accruing (1) |  | 8,553 | [1] | 9,232 | [2]
Total past due |  | 21,763 |  | 20,747 |
Total current (2) |  | 1,113,742 |  | 1,091,195 |
Recorded Investment |  | 1,135,505 |  | 1,111,942 |
Commercial |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Accruing loans past due 30-89 days |  | 683 |  | 16 |
Past due, nonaccrual loans and loans past due 90 days or more and accruing (1) |  | 1,104 | [1] | 1,586 | [2]
Total past due |  | 1,787 |  | 1,602 |
Total current (2) |  | 429,093 |  | 392,521 |
Recorded Investment |  | 430,880 |  | 394,123 |
Installment |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Accruing loans past due 30-89 days |  | 28 |  | 54 |
Past due, nonaccrual loans and loans past due 90 days or more and accruing (1) |  | 19 | [1] | 19 | [2]
Total past due |  | 47 |  | 73 |
Total current (2) |  | 2,393 |  | 3,818 |
Recorded Investment |  | 2,440 |  | 3,891 |
Mortgage |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Accruing loans past due 30-89 days |  | 133 |  | 256 |
Past due, nonaccrual loans and loans past due 90 days or more and accruing (1) | [1] | 20 |  |  |
Total past due |  | 153 |  | 256 |
Total current (2) |  | 70,539 |  | 52,080 |
Recorded Investment |  | 70,692 |  | 52,336 |
Commercial |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Accruing loans past due 30-89 days |  |  |  | 29 |
Past due, nonaccrual loans and loans past due 90 days or more and accruing (1) | [1] | 1,635 |  |  |
Total past due |  | 1,635 |  | 29 |
Total current (2) |  | 174,466 |  | 125,761 |
Recorded Investment |  | 176,101 |  | 125,790 |
Commercial, financial and agricultural |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Accruing loans past due 30-89 days |  | 4,786 |  | 145 |
Past due, nonaccrual loans and loans past due 90 days or more and accruing (1) |  | 1,375 | [1] | 1,043 | [2]
Total past due |  | 6,161 |  | 1,188 |
Total current (2) |  | 1,071,228 |  | 1,056,678 |
Recorded Investment | [3] | 1,077,389 |  | 1,057,866 |
Commercial real estate |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Accruing loans past due 30-89 days |  | 780 |  | 856 |
Past due, nonaccrual loans and loans past due 90 days or more and accruing (1) |  | 3,584 | [1] | 2,360 | [2]
Total past due |  | 4,364 |  | 3,216 |
Total current (2) |  | 1,283,431 |  | 1,168,674 |
Recorded Investment | [3] | 1,287,795 |  | 1,171,890 |
Construction real estate |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Recorded Investment |  | 249,233 |  | 182,017 |
Consumer |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Accruing loans past due 30-89 days |  | 9,524 |  | 11,515 |
Past due, nonaccrual loans and loans past due 90 days or more and accruing (1) |  | 2,131 | [1] | 2,407 | [2]
Total past due |  | 11,655 |  | 13,922 |
Total current (2) |  | 1,284,237 |  | 1,231,622 |
Recorded Investment |  | 1,295,892 |  | 1,245,544 |
Leases |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total current (2) |  | 2,299 |  | 3,029 |
Recorded Investment |  | $ 2,299 |  | $ 3,029 |
[1] | (1) Includes an aggregate of $2.3 million of loans past due 90 days or more and accruing. The remaining are past due, nonaccrual loans.(2) Includes an aggregate of $50.7 million of nonaccrual loans which are current in regards to contractual principal and interest payments.
[2] | (1) Includes an aggregate of $1.8 million of loans past due 90 days or more and accruing. The remaining are past due, nonaccrual loans.(2) Includes an aggregate of $56.1 million of nonaccrual loans which are current in regards to contractual principal and interest payments.
[3] | Included within commercial, financial and agricultural loans and commercial real estate loans is an immaterial amount of consumer loans that were not broken out by class.

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