Business Combinations - Summary of Assets Acquired and Liabilities Assumed and Their Initial Fair Value Estimates (Details) - USD ($) $ in Thousands	Jan. 01, 2020	Jan. 31, 2019	Jun. 30, 2020	Dec. 31, 2019
Assets acquired:
Bank Owned Life Insurance			$ 262,637	$ 237,411
Liabilities assumed:
Goodwill recorded in the merger			501,472	$ 374,632
Capital Bank
Estimated Fair Value
Total consideration paid		$ 76,834
Assets acquired:
Cash and cash equivalents		59,748
Securities		103,775
Loans		307,300
Accrued interest receivable		1,390
Bank Owned Life Insurance		10,460
Deferred tax asset		4,101
Other assets		4,980
Core deposit intangible		2,662	2,700
Total assets acquired		494,416
Liabilities assumed:
Deposits		(449,018)
Other liabilities		(5,210)
Total liabilities assumed		(454,228)
Net assets acquired		40,188
Goodwill recorded in the merger		$ 36,646
Two River Bancorp Inc.
Estimated Fair Value
Total consideration paid	$ 197,050
Assets acquired:
Cash and cash equivalents	51,102
Securities	64,381
Loans	940,072
Accrued interest receivable	2,382
Bank Owned Life Insurance	22,440
Deferred tax asset	3,577
Other assets	15,956
Core deposit intangible	12,130		12,100
Total assets acquired	1,112,040
Liabilities assumed:
Deposits	(941,750)
Other liabilities	(59,002)
Total liabilities assumed	(1,000,752)
Net assets acquired	111,288
Goodwill recorded in the merger	85,762
Country Bank Holding Company, Inc
Estimated Fair Value
Total consideration paid	112,836
Assets acquired:
Cash and cash equivalents	20,799
Securities	144,499
Loans	618,408
Accrued interest receivable	1,779
Deferred tax asset	(3,922)
Other assets	8,390
Core deposit intangible	2,117		$ 2,100
Total assets acquired	792,070
Liabilities assumed:
Deposits	(652,653)
Other liabilities	(67,226)
Total liabilities assumed	(719,879)
Net assets acquired	72,191
Goodwill recorded in the merger	$ 40,645