Business Combinations- Summary of Estimated Fair Values of Assets Acquired and Liabilities (Details) - USD ($) $ in Thousands	Jan. 31, 2019	Jan. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Assets acquired:
Bank Owned Life Insurance			$ 237,411	$ 222,482
Liabilities assumed:
Goodwill recorded in the merger			$ 374,632	$ 338,442
Capital Bank
Business Acquisition [Line Items]
Total Purchase Price:	$ 76,834
Assets acquired:
Cash and cash equivalents	59,748
Securities	103,775
Loans	307,778
Accrued interest receivable	1,390
Bank Owned Life Insurance	10,460
Deferred tax asset	3,967
Other assets	4,980
Core deposit intangible	2,662
Total assets acquired	494,760
Liabilities assumed:
Deposits	449,018
Other liabilities	5,121
Total liabilities assumed	454,139
Net assets acquired	40,621
Goodwill recorded in the merger	$ 36,213
Sun Bancorp, Inc.
Business Acquisition [Line Items]
Total Purchase Price:		$ 474,930
Assets acquired:
Cash and cash equivalents		68,632
Securities		254,522
Loans		1,517,345
Accrued interest receivable		5,621
Bank Owned Life Insurance		85,238
Deferred tax asset		57,597
Other assets		43,202
Core deposit intangible		11,897
Total assets acquired		2,044,054
Liabilities assumed:
Deposits		1,616,073
Borrowings		127,727
Other liabilities		13,242
Total liabilities assumed		1,757,042
Net assets acquired		287,012
Goodwill recorded in the merger		$ 187,918