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Allowance for Credit Losses - Investment in Loans, Net of Unearned Income on Impairment Methodology (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
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Investment in loans, net of unearned income on impairment methodology |  |
Individually evaluated for impairment | $ 23,387 | $ 51,179
Collectively evaluated for impairment | 10,973,917 | 9,466,195
Loans, net of unearned income | 11,000,796 | 9,693,463
Loans, net of unearned income | 10,997,304 | 9,689,638
Purchased with deteriorated credit quality |  |
Investment in loans, net of unearned income on impairment methodology |  |
Loans, net of unearned income |  | 172,264
Commercial |  |
Investment in loans, net of unearned income on impairment methodology |  |
Individually evaluated for impairment | 9,736 | 8,460
Collectively evaluated for impairment | 2,631,862 | 1,329,974
Loans, net of unearned income | 2,641,598 | 1,367,972
Loans, net of unearned income | 2,641,598 | 1,367,972
Commercial | Purchased with deteriorated credit quality |  |
Investment in loans, net of unearned income on impairment methodology |  |
Loans, net of unearned income |  | 29,538
Real estate – construction: |  |
Investment in loans, net of unearned income on impairment methodology |  |
Individually evaluated for impairment | 0 | 12,416
Collectively evaluated for impairment | 791,108 | 813,204
Loans, net of unearned income | 791,108 | 826,483
Loans, net of unearned income | 791,108 | 826,483
Real estate – construction: | Purchased with deteriorated credit quality |  |
Investment in loans, net of unearned income on impairment methodology |  |
Loans, net of unearned income |  | 863
Real estate – 1-4 family mortgage |  |
Investment in loans, net of unearned income on impairment methodology |  |
Individually evaluated for impairment | 5,142 | 20,262
Collectively evaluated for impairment | 2,783,371 | 2,810,808
Loans, net of unearned income | 2,788,513 | 2,866,613
Loans, net of unearned income | 2,788,513 | 2,866,613
Real estate – 1-4 family mortgage | Purchased with deteriorated credit quality |  |
Investment in loans, net of unearned income on impairment methodology |  |
Loans, net of unearned income |  | 35,543
Real estate – commercial mortgage: |  |
Investment in loans, net of unearned income on impairment methodology |  |
Individually evaluated for impairment | 7,883 | 9,550
Collectively evaluated for impairment | 4,402,870 | 4,131,582
Loans, net of unearned income | 4,410,753 | 4,244,265
Loans, net of unearned income | 4,410,753 | 4,244,265
Real estate – commercial mortgage: | Purchased with deteriorated credit quality |  |
Investment in loans, net of unearned income on impairment methodology |  |
Loans, net of unearned income |  | 103,133
Installment and Other |  |
Investment in loans, net of unearned income on impairment methodology |  |
Individually evaluated for impairment | 626 | 491
Collectively evaluated for impairment | 283,927 | 380,627
Loans, net of unearned income | 284,553 | 302,430
Loans, net of unearned income | $ 284,553 | 384,305
Installment and Other | Purchased with deteriorated credit quality |  |
Investment in loans, net of unearned income on impairment methodology |  |
Loans, net of unearned income |  | $ 3,187

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