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Purchased Loans - Summary of Purchased Loans (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
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Summary of loans |  |
Gross loans | $ 7,701,432 | $ 7,623,663
Unearned income | (3,362) | (3,341)
Loans, net of unearned income | 7,698,070 | 7,620,322
Purchased loans |  |
Summary of loans |  |
Gross loans | 1,867,948 | 2,031,766
Unearned income | 0 | 0
Loans, net of unearned income | 1,867,948 | 2,031,766
Commercial, financial, agricultural |  |
Summary of loans |  |
Gross loans | 1,046,818 | 1,039,393
Loans, net of unearned income | 1,046,818 | 1,039,393
Commercial, financial, agricultural | Purchased loans |  |
Summary of loans |  |
Gross loans | 243,672 | 275,570
Loans, net of unearned income | 243,672 | 275,570
Real estate – construction |  |
Summary of loans |  |
Gross loans | 657,491 | 633,389
Loans, net of unearned income | 657,491 | 633,389
Real estate – construction | Purchased loans |  |
Summary of loans |  |
Gross loans | 75,061 | 85,731
Loans, net of unearned income | 75,061 | 85,731
Real estate – 1-4 family mortgage |  |
Summary of loans |  |
Gross loans | 2,358,101 | 2,343,721
Loans, net of unearned income | 2,358,101 | 2,343,721
Real estate – 1-4 family mortgage | Purchased loans |  |
Summary of loans |  |
Gross loans | 572,830 | 614,187
Loans, net of unearned income | 572,830 | 614,187
Real estate – commercial mortgage |  |
Summary of loans |  |
Gross loans | 3,463,953 | 3,427,530
Loans, net of unearned income | 3,463,953 | 3,427,530
Real estate – commercial mortgage | Purchased loans |  |
Summary of loans |  |
Gross loans | 960,273 | 1,037,454
Loans, net of unearned income | 960,273 | 1,037,454
Installment loans to individuals |  |
Summary of loans |  |
Gross loans | 119,171 | 122,276
Loans, net of unearned income | 171,707 | 176,289
Installment loans to individuals | Purchased loans |  |
Summary of loans |  |
Gross loans | 16,112 | 18,824
Loans, net of unearned income | $ 16,112 | $ 18,824

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- Definition Amount of deferred interest and fee income, unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of acquired loans. Excludes amounts for 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 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84159169&loc=d3e10152-111534 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=84165051&loc=d3e45377-112738 + Details
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