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Non Purchased Loans - Loan Portfolio by Risk-Rating Grades (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
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Loan portfolio by risk-rating grades |  |
Total | $ 7,448,608 | $ 6,202,709
Commercial, financial, agricultural |  |
Loan portfolio by risk-rating grades |  |
Total | 1,008,935 | 717,490
Real estate – construction |  |
Loan portfolio by risk-rating grades |  |
Total | 577,720 | 552,679
Real estate – 1-4 family mortgage |  |
Loan portfolio by risk-rating grades |  |
Total | 2,295,852 | 1,878,177
Real estate – commercial mortgage |  |
Loan portfolio by risk-rating grades |  |
Total | 3,390,389 | 2,898,895
Installment loans to individuals |  |
Loan portfolio by risk-rating grades |  |
Total | 175,712 | 155,468
Non purchased loans and leases |  |
Loan portfolio by risk-rating grades |  |
Total | 5,293,467 | 4,713,572
Non purchased loans and leases | Internal Noninvestment Grade |  |
Loan portfolio by risk-rating grades |  |
Total | 3,188,818 | 2,808,367
Non purchased loans and leases | Internal Noninvestment Grade | Commercial, financial, agricultural |  |
Loan portfolio by risk-rating grades |  |
Total | 527,641 | 439,704
Non purchased loans and leases | Internal Noninvestment Grade | Real estate – construction |  |
Loan portfolio by risk-rating grades |  |
Total | 415,386 | 402,549
Non purchased loans and leases | Internal Noninvestment Grade | Real estate – 1-4 family mortgage |  |
Loan portfolio by risk-rating grades |  |
Total | 256,854 | 200,385
Non purchased loans and leases | Internal Noninvestment Grade | Real estate – commercial mortgage |  |
Loan portfolio by risk-rating grades |  |
Total | 1,988,433 | 1,765,729
Non purchased loans and leases | Internal Noninvestment Grade | Installment loans to individuals |  |
Loan portfolio by risk-rating grades |  |
Total | 504 |
Non purchased loans and leases | Pass |  |
Loan portfolio by risk-rating grades |  |
Total | 3,150,037 | 2,761,884
Non purchased loans and leases | Pass | Commercial, financial, agricultural |  |
Loan portfolio by risk-rating grades |  |
Total | 522,410 | 434,323
Non purchased loans and leases | Pass | Real estate – construction |  |
Loan portfolio by risk-rating grades |  |
Total | 415,168 | 402,156
Non purchased loans and leases | Pass | Real estate – 1-4 family mortgage |  |
Loan portfolio by risk-rating grades |  |
Total | 247,584 | 190,882
Non purchased loans and leases | Pass | Real estate – commercial mortgage |  |
Loan portfolio by risk-rating grades |  |
Total | 1,964,371 | 1,734,523
Non purchased loans and leases | Pass | Installment loans to individuals |  |
Loan portfolio by risk-rating grades |  |
Total | 504 |
Non purchased loans and leases | Watch |  |
Loan portfolio by risk-rating grades |  |
Total | 21,821 | 26,416
Non purchased loans and leases | Watch | Commercial, financial, agricultural |  |
Loan portfolio by risk-rating grades |  |
Total | 4,505 | 4,531
Non purchased loans and leases | Watch | Real estate – construction |  |
Loan portfolio by risk-rating grades |  |
Total | 130 | 393
Non purchased loans and leases | Watch | Real estate – 1-4 family mortgage |  |
Loan portfolio by risk-rating grades |  |
Total | 3,778 | 3,374
Non purchased loans and leases | Watch | Real estate – commercial mortgage |  |
Loan portfolio by risk-rating grades |  |
Total | 13,408 | 18,118
Non purchased loans and leases | Watch | Installment loans to individuals |  |
Loan portfolio by risk-rating grades |  |
Total | 0 |
Non purchased loans and leases | Substandard |  |
Loan portfolio by risk-rating grades |  |
Total | 16,960 | 20,067
Non purchased loans and leases | Substandard | Commercial, financial, agricultural |  |
Loan portfolio by risk-rating grades |  |
Total | 726 | 850
Non purchased loans and leases | Substandard | Real estate – construction |  |
Loan portfolio by risk-rating grades |  |
Total | 88 | 0
Non purchased loans and leases | Substandard | Real estate – 1-4 family mortgage |  |
Loan portfolio by risk-rating grades |  |
Total | 5,492 | 6,129
Non purchased loans and leases | Substandard | Real estate – commercial mortgage |  |
Loan portfolio by risk-rating grades |  |
Total | 10,654 | $ 13,088
Non purchased loans and leases | Substandard | Installment loans to individuals |  |
Loan portfolio by risk-rating grades |  |
Total | $ 0 |

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- Definition Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524 + Details
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