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Non Purchased Loans - Summary of Non-Purchased Loans and Leases (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Summary of loans |  |
Gross loans | $ 7,451,394 | $ 6,205,118
Unearned income | (2,786) | (2,409)
Loans, net of unearned income | 7,448,608 | 6,202,709
Commercial, financial, agricultural |  |
Summary of loans |  |
Gross loans | 1,008,935 | 717,490
Loans, net of unearned income | 1,008,935 | 717,490
Lease financing |  |
Summary of loans |  |
Gross loans | 54,688 | 49,250
Real estate – construction |  |
Summary of loans |  |
Gross loans | 577,720 | 552,679
Loans, net of unearned income | 577,720 | 552,679
Real estate – 1-4 family mortgage |  |
Summary of loans |  |
Gross loans | 2,295,852 | 1,878,177
Loans, net of unearned income | 2,295,852 | 1,878,177
Real estate – commercial mortgage |  |
Summary of loans |  |
Gross loans | 3,390,389 | 2,898,895
Loans, net of unearned income | 3,390,389 | 2,898,895
Installment loans to individuals |  |
Summary of loans |  |
Gross loans | 123,810 | 108,627
Loans, net of unearned income | 175,712 | 155,468
Non purchased loans and leases |  |
Summary of loans |  |
Gross loans | 5,296,253 | 4,715,981
Unearned income | (2,786) | (2,409)
Loans, net of unearned income | 5,293,467 | 4,713,572
Non purchased loans and leases | Commercial, financial, agricultural |  |
Summary of loans |  |
Gross loans | 707,835 | 589,290
Non purchased loans and leases | Lease financing |  |
Summary of loans |  |
Gross loans | 54,688 | 49,250
Non purchased loans and leases | Real estate – construction |  |
Summary of loans |  |
Gross loans | 477,638 | 483,926
Non purchased loans and leases | Real estate – 1-4 family mortgage |  |
Summary of loans |  |
Gross loans | 1,644,060 | 1,425,730
Non purchased loans and leases | Real estate – commercial mortgage |  |
Summary of loans |  |
Gross loans | 2,311,340 | 2,075,137
Non purchased loans and leases | Installment loans to individuals |  |
Summary of loans |  |
Gross loans | $ 100,692 | $ 92,648

X
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