Acquired and Covered Loans - Acquired Loans (Details) - USD ($) $ in Thousands		Sep. 30, 2019	Dec. 31, 2018
Acquired Loans (Details) - Acquired Loans [Line Items]
Non-PCI	[1]	$ 1,408,977	$ 1,252,361
Total	[1]	1,574,803	1,366,229
Acquired loans
Acquired Loans (Details) - Acquired Loans [Line Items]
Non-PCI	[1]	1,404,960	1,247,492
Total	[1]	1,565,320	1,355,541
Covered loans
Acquired Loans (Details) - Acquired Loans [Line Items]
Non-PCI	[1]	4,017	4,869
Total	[1]	9,483	10,688
Receivables acquired with deteriorated credit quality
Acquired Loans (Details) - Acquired Loans [Line Items]
PCI	[1]	165,826	113,868
Receivables acquired with deteriorated credit quality | Acquired loans
Acquired Loans (Details) - Acquired Loans [Line Items]
PCI	[1]	160,360	108,049
Receivables acquired with deteriorated credit quality | Covered loans
Acquired Loans (Details) - Acquired Loans [Line Items]
PCI	[1]	$ 5,466	$ 5,819

[1] Included in loans in the Consolidated Statements of Financial Condition.