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Business Combinations and Divestitures - Schedule of Supplemental Pro Forma Information on Acquisition (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
FBD
Business Acquisition, Pro Forma Information [Abstract]
Net interest income	$ 65,694	$ 44,683	$ 176,441	$ 125,098
Noninterest income	7,167	5,404	19,679	40,072
Net income	$ 8,371	$ 10,595	$ 34,179	$ 32,291
Basic earnings per common share	$ 0.31	$ 0.44	$ 1.31	$ 1.42
Diluted earnings per common share	$ 0.31	$ 0.43	$ 1.30	$ 1.39
SCC
Business Acquisition, Pro Forma Information [Abstract]
Net interest income	$ 62,269	$ 40,147	$ 163,916	$ 111,756
Noninterest income	6,159	4,260	16,618	37,028
Net income	$ 8,578	$ 9,804	$ 33,458	$ 30,065
Basic earnings per common share	$ 0.32	$ 0.48	$ 1.35	$ 1.55
Diluted earnings per common share	$ 0.32	$ 0.47	$ 1.33	$ 1.51
Total
Business Acquisition, Pro Forma Information [Abstract]
Net interest income	$ 66,181	$ 45,318	$ 178,188	$ 126,966
Noninterest income	7,267	5,493	20,121	40,442
Net income	$ 7,778	$ 10,617	$ 34,013	$ 32,441
Basic earnings per common share	$ 0.29	$ 0.43	$ 1.30	$ 1.40
Diluted earnings per common share	$ 0.29	$ 0.43	$ 1.28	$ 1.37

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- Definition

Business acquisitions pro forma interest income (expense) net.

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- Definition

The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(3)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

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-Publisher FASB
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The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
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The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

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-Publisher FASB
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