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Non Purchased Loans - Loan Portfolio by Risk-Rating Grades (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Loan portfolio by risk-rating grades |  |
Loans, net of unearned income | $ 9,313,784 | $ 9,083,129
Commercial, financial, agricultural |  |
Loan portfolio by risk-rating grades |  |
Loans, net of unearned income | 1,328,560 | 1,295,912
Real estate – construction |  |
Loan portfolio by risk-rating grades |  |
Loans, net of unearned income | 816,695 | 740,668
Real estate – 1-4 family mortgage |  |
Loan portfolio by risk-rating grades |  |
Loans, net of unearned income | 2,797,633 | 2,795,343
Real estate – commercial mortgage |  |
Loan portfolio by risk-rating grades |  |
Loans, net of unearned income | 4,022,375 | 4,051,509
Installment loans to individuals |  |
Loan portfolio by risk-rating grades |  |
Loans, net of unearned income | 348,521 | 199,697
Non purchased loans and leases |  |
Loan portfolio by risk-rating grades |  |
Loans, net of unearned income | 7,031,818 | 6,389,712
Non purchased loans and leases | Internal Noninvestment Grade |  |
Loan portfolio by risk-rating grades |  |
Loans, net of unearned income | 4,277,183 | 3,829,377
Non purchased loans and leases | Internal Noninvestment Grade | Commercial, financial, agricultural |  |
Loan portfolio by risk-rating grades |  |
Loans, net of unearned income | 767,592 | 641,102
Non purchased loans and leases | Internal Noninvestment Grade | Real estate – construction |  |
Loan portfolio by risk-rating grades |  |
Loans, net of unearned income | 702,949 | 568,968
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 | 327,404 | 330,484
Non purchased loans and leases | Internal Noninvestment Grade | Real estate – commercial mortgage |  |
Loan portfolio by risk-rating grades |  |
Loans, net of unearned income | 2,479,210 | 2,288,823
Non purchased loans and leases | Internal Noninvestment Grade | Installment loans to individuals |  |
Loan portfolio by risk-rating grades |  |
Loans, net of unearned income | 28 | 0
Non purchased loans and leases | Pass |  |
Loan portfolio by risk-rating grades |  |
Loans, net of unearned income | 4,173,682 | 3,705,961
Non purchased loans and leases | Pass | Commercial, financial, agricultural |  |
Loan portfolio by risk-rating grades |  |
Loans, net of unearned income | 742,438 | 615,803
Non purchased loans and leases | Pass | Real estate – construction |  |
Loan portfolio by risk-rating grades |  |
Loans, net of unearned income | 691,112 | 558,494
Non purchased loans and leases | Pass | Real estate – 1-4 family mortgage |  |
Loan portfolio by risk-rating grades |  |
Loans, net of unearned income | 320,874 | 321,564
Non purchased loans and leases | Pass | Real estate – commercial mortgage |  |
Loan portfolio by risk-rating grades |  |
Loans, net of unearned income | 2,419,230 | 2,210,100
Non purchased loans and leases | Pass | Installment loans to individuals |  |
Loan portfolio by risk-rating grades |  |
Loans, net of unearned income | 28 | 0
Non purchased loans and leases | Watch |  |
Loan portfolio by risk-rating grades |  |
Loans, net of unearned income | 52,973 | 79,882
Non purchased loans and leases | Watch | Commercial, financial, agricultural |  |
Loan portfolio by risk-rating grades |  |
Loans, net of unearned income | 12,351 | 18,326
Non purchased loans and leases | Watch | Real estate – construction |  |
Loan portfolio by risk-rating grades |  |
Loans, net of unearned income | 2,923 | 2,317
Non purchased loans and leases | Watch | Real estate – 1-4 family mortgage |  |
Loan portfolio by risk-rating grades |  |
Loans, net of unearned income | 3,520 | 4,660
Non purchased loans and leases | Watch | Real estate – commercial mortgage |  |
Loan portfolio by risk-rating grades |  |
Loans, net of unearned income | 34,179 | 54,579
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 | 50,528 | 43,534
Non purchased loans and leases | Substandard | Commercial, financial, agricultural |  |
Loan portfolio by risk-rating grades |  |
Loans, net of unearned income | 12,803 | 6,973
Non purchased loans and leases | Substandard | Real estate – construction |  |
Loan portfolio by risk-rating grades |  |
Loans, net of unearned income | 8,914 | 8,157
Non purchased loans and leases | Substandard | Real estate – 1-4 family mortgage |  |
Loan portfolio by risk-rating grades |  |
Loans, net of unearned income | 3,010 | 4,260
Non purchased loans and leases | Substandard | Real estate – commercial mortgage |  |
Loan portfolio by risk-rating grades |  |
Loans, net of unearned income | 25,801 | 24,144
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=118952595&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=118936363&loc=d3e5074-111524 + Details
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