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Non Purchased Loans - Loan Portfolio by Risk-Rating Grades (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Loan portfolio by risk-rating grades |  |
Total | $ 7,698,070 | $ 7,620,322
Commercial, financial, agricultural |  |
Loan portfolio by risk-rating grades |  |
Total | 1,046,818 | 1,039,393
Real estate – construction |  |
Loan portfolio by risk-rating grades |  |
Total | 657,491 | 633,389
Real estate – 1-4 family mortgage |  |
Loan portfolio by risk-rating grades |  |
Total | 2,358,101 | 2,343,721
Real estate – commercial mortgage |  |
Loan portfolio by risk-rating grades |  |
Total | 3,463,953 | 3,427,530
Installment loans to individuals |  |
Loan portfolio by risk-rating grades |  |
Total | 171,707 | 176,289
Non purchased loans and leases |  |
Loan portfolio by risk-rating grades |  |
Total | 5,830,122 | 5,588,556
Non purchased loans and leases | Internal Noninvestment Grade |  |
Loan portfolio by risk-rating grades |  |
Total | 3,562,164 | 3,378,267
Non purchased loans and leases | Internal Noninvestment Grade | Commercial, financial, agricultural |  |
Loan portfolio by risk-rating grades |  |
Total | 602,988 | 570,841
Non purchased loans and leases | Internal Noninvestment Grade | Real estate – construction |  |
Loan portfolio by risk-rating grades |  |
Total | 521,733 | 484,241
Non purchased loans and leases | Internal Noninvestment Grade | Real estate – 1-4 family mortgage |  |
Loan portfolio by risk-rating grades |  |
Total | 270,385 | 263,845
Non purchased loans and leases | Internal Noninvestment Grade | Real estate – commercial mortgage |  |
Loan portfolio by risk-rating grades |  |
Total | 2,166,206 | 2,058,419
Non purchased loans and leases | Internal Noninvestment Grade | Installment loans to individuals |  |
Loan portfolio by risk-rating grades |  |
Total | 852 | 921
Non purchased loans and leases | Pass |  |
Loan portfolio by risk-rating grades |  |
Total | 3,456,223 | 3,277,755
Non purchased loans and leases | Pass | Commercial, financial, agricultural |  |
Loan portfolio by risk-rating grades |  |
Total | 585,850 | 554,943
Non purchased loans and leases | Pass | Real estate – construction |  |
Loan portfolio by risk-rating grades |  |
Total | 512,603 | 483,498
Non purchased loans and leases | Pass | Real estate – 1-4 family mortgage |  |
Loan portfolio by risk-rating grades |  |
Total | 262,107 | 254,643
Non purchased loans and leases | Pass | Real estate – commercial mortgage |  |
Loan portfolio by risk-rating grades |  |
Total | 2,094,811 | 1,983,750
Non purchased loans and leases | Pass | Installment loans to individuals |  |
Loan portfolio by risk-rating grades |  |
Total | 852 | 921
Non purchased loans and leases | Watch |  |
Loan portfolio by risk-rating grades |  |
Total | 73,146 | 63,091
Non purchased loans and leases | Watch | Commercial, financial, agricultural |  |
Loan portfolio by risk-rating grades |  |
Total | 11,380 | 11,496
Non purchased loans and leases | Watch | Real estate – construction |  |
Loan portfolio by risk-rating grades |  |
Total | 8,690 | 662
Non purchased loans and leases | Watch | Real estate – 1-4 family mortgage |  |
Loan portfolio by risk-rating grades |  |
Total | 669 | 505
Non purchased loans and leases | Watch | Real estate – commercial mortgage |  |
Loan portfolio by risk-rating grades |  |
Total | 52,407 | 50,428
Non purchased loans and leases | Watch | Installment loans to individuals |  |
Loan portfolio by risk-rating grades |  |
Total | 0 | 0
Non purchased loans and leases | Substandard |  |
Loan portfolio by risk-rating grades |  |
Total | 32,795 | 37,421
Non purchased loans and leases | Substandard | Commercial, financial, agricultural |  |
Loan portfolio by risk-rating grades |  |
Total | 5,758 | 4,402
Non purchased loans and leases | Substandard | Real estate – construction |  |
Loan portfolio by risk-rating grades |  |
Total | 440 | 81
Non purchased loans and leases | Substandard | Real estate – 1-4 family mortgage |  |
Loan portfolio by risk-rating grades |  |
Total | 7,609 | 8,697
Non purchased loans and leases | Substandard | Real estate – commercial mortgage |  |
Loan portfolio by risk-rating grades |  |
Total | 18,988 | 24,241
Non purchased loans and leases | Substandard | Installment loans to individuals |  |
Loan portfolio by risk-rating grades |  |
Total | $ 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://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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