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Merger - Summary of Acquired Loans (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Aug. 01, 2019
Business Combinations [Abstract]      
Goodwill $ 1,313,046 $ 1,299,878 $ 1,158,289
PCI loans:      
Contractually required payments receivable     413,176
Nonaccretable difference     (63,014)
Expected cash flows     350,162
Accretable yield     38,479
Fair value of PCI loans     311,683
Purchased nonimpaired loans and leases:      
Unpaid principal balance     15,636,020
Fair value discount     (234,304)
Fair value at acquisition     15,401,716
Total fair value at acquisition     $ 15,713,399