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Non Purchased Loans - Loan Portfolio by Risk-Rating Grades (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Loan portfolio by risk-rating grades |  |
Loans, net of unearned income | $ 9,122,907 | $ 7,620,322
Commercial, financial, agricultural |  |
Loan portfolio by risk-rating grades |  |
Loans, net of unearned income | 1,313,344 | 1,039,393
Real estate – construction |  |
Loan portfolio by risk-rating grades |  |
Loans, net of unearned income | 736,985 | 633,389
Real estate – 1-4 family mortgage |  |
Loan portfolio by risk-rating grades |  |
Loans, net of unearned income | 2,762,683 | 2,343,721
Real estate – commercial mortgage |  |
Loan portfolio by risk-rating grades |  |
Loans, net of unearned income | 4,112,585 | 3,427,530
Installment loans to individuals |  |
Loan portfolio by risk-rating grades |  |
Loans, net of unearned income | 197,310 | 176,289
Non purchased loans and leases |  |
Loan portfolio by risk-rating grades |  |
Loans, net of unearned income | 6,210,238 | 5,588,556
Non purchased loans and leases | Internal Noninvestment Grade |  |
Loan portfolio by risk-rating grades |  |
Loans, net of unearned income | 3,752,988 | 3,378,267
Non purchased loans and leases | Internal Noninvestment Grade | Commercial, financial, agricultural |  |
Loan portfolio by risk-rating grades |  |
Loans, net of unearned income | 613,790 | 570,841
Non purchased loans and leases | Internal Noninvestment Grade | Real estate – construction |  |
Loan portfolio by risk-rating grades |  |
Loans, net of unearned income | 558,539 | 484,241
Non purchased loans and leases | Internal Noninvestment Grade | Real estate – 1-4 family mortgage |  |
Loan portfolio by risk-rating grades |  |
Loans, net of unearned income | 305,021 | 263,845
Non purchased loans and leases | Internal Noninvestment Grade | Real estate – commercial mortgage |  |
Loan portfolio by risk-rating grades |  |
Loans, net of unearned income | 2,275,068 | 2,058,419
Non purchased loans and leases | Internal Noninvestment Grade | Installment loans to individuals |  |
Loan portfolio by risk-rating grades |  |
Loans, net of unearned income | 570 | 921
Non purchased loans and leases | Pass |  |
Loan portfolio by risk-rating grades |  |
Loans, net of unearned income | 3,643,101 | 3,277,755
Non purchased loans and leases | Pass | Commercial, financial, agricultural |  |
Loan portfolio by risk-rating grades |  |
Loans, net of unearned income | 596,176 | 554,943
Non purchased loans and leases | Pass | Real estate – construction |  |
Loan portfolio by risk-rating grades |  |
Loans, net of unearned income | 548,080 | 483,498
Non purchased loans and leases | Pass | Real estate – 1-4 family mortgage |  |
Loan portfolio by risk-rating grades |  |
Loans, net of unearned income | 298,125 | 254,643
Non purchased loans and leases | Pass | Real estate – commercial mortgage |  |
Loan portfolio by risk-rating grades |  |
Loans, net of unearned income | 2,200,150 | 1,983,750
Non purchased loans and leases | Pass | Installment loans to individuals |  |
Loan portfolio by risk-rating grades |  |
Loans, net of unearned income | 570 | 921
Non purchased loans and leases | Watch |  |
Loan portfolio by risk-rating grades |  |
Loans, net of unearned income | 67,587 | 63,091
Non purchased loans and leases | Watch | Commercial, financial, agricultural |  |
Loan portfolio by risk-rating grades |  |
Loans, net of unearned income | 12,885 | 11,496
Non purchased loans and leases | Watch | Real estate – construction |  |
Loan portfolio by risk-rating grades |  |
Loans, net of unearned income | 764 | 662
Non purchased loans and leases | Watch | Real estate – 1-4 family mortgage |  |
Loan portfolio by risk-rating grades |  |
Loans, net of unearned income | 1,093 | 505
Non purchased loans and leases | Watch | Real estate – commercial mortgage |  |
Loan portfolio by risk-rating grades |  |
Loans, net of unearned income | 52,845 | 50,428
Non purchased loans and leases | Watch | Installment loans to individuals |  |
Loan portfolio by risk-rating grades |  |
Loans, net of unearned income | 0 | 0
Non purchased loans and leases | Substandard |  |
Loan portfolio by risk-rating grades |  |
Loans, net of unearned income | 42,300 | 37,421
Non purchased loans and leases | Substandard | Commercial, financial, agricultural |  |
Loan portfolio by risk-rating grades |  |
Loans, net of unearned income | 4,729 | 4,402
Non purchased loans and leases | Substandard | Real estate – construction |  |
Loan portfolio by risk-rating grades |  |
Loans, net of unearned income | 9,695 | 81
Non purchased loans and leases | Substandard | Real estate – 1-4 family mortgage |  |
Loan portfolio by risk-rating grades |  |
Loans, net of unearned income | 5,803 | 8,697
Non purchased loans and leases | Substandard | Real estate – commercial mortgage |  |
Loan portfolio by risk-rating grades |  |
Loans, net of unearned income | 22,073 | 24,241
Non purchased loans and leases | Substandard | Installment loans to individuals |  |
Loan portfolio by risk-rating grades |  |
Loans, net of unearned income | $ 0 | $ 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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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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