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Mergers and Acquisitions - Summary of Fair Value of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Sep. 01, 2018	Jul. 01, 2017
Brand
Business Acquisition [Line Items]
Cash and cash equivalents	$ 193,436
Securities	70,123
Loans, including mortgage loans held for sale	1,593,894
Premises and equipment	20,782
Intangible assets	343,569
Other assets	113,324
Total assets	2,335,128
Deposits	1,714,177
Borrowings	90,912
Other liabilities	55,586
Total liabilities	1,860,675
Metropolitan Bancgroup, Inc.
Business Acquisition [Line Items]
Cash and cash equivalents		$ 47,556
Securities		108,697
Loans, including mortgage loans held for sale		967,804
Premises and equipment		8,576
Other real estate owned		1,203
Intangible assets		147,478
Other assets		69,567
Total assets		1,350,881
Deposits		942,084
Borrowings		174,522
Other liabilities		20,685
Total liabilities		$ 1,137,291
Brand Mortgage Group, LLC
Business Acquisition [Line Items]
Borrowings	34,139
Loans held for sale	$ 48,100

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