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Business Combinations and Divestitures - Schedule of Supplemental Pro Forma Information on Acquisition (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
FBD
Business Acquisition, Pro Forma Information [Abstract]
Net interest income	$ 241,322	$ 176,154
Noninterest income	26,473	45,570
Net income	$ 52,269	$ 39,211
Basic earnings per common share	$ 2.00	$ 1.68
Diluted earnings per common share	$ 1.97	$ 1.65
SCC
Business Acquisition, Pro Forma Information [Abstract]
Net interest income	$ 228,797	$ 158,166
Noninterest income	23,412	41,166
Net income	$ 51,541	$ 36,475
Basic earnings per common share	$ 2.05	$ 1.83
Diluted earnings per common share	$ 2.01	$ 1.79
Total
Business Acquisition, Pro Forma Information [Abstract]
Net interest income	$ 243,069	$ 178,636
Noninterest income	26,915	46,080
Net income	$ 52,102	$ 39,466
Basic earnings per common share	$ 1.99	$ 1.66
Diluted earnings per common share	$ 1.96	$ 1.63

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- Definition

Business acquisitions pro forma interest income (expense) net.

+ References

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Business acquisitions pro forma noninterest income.

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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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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.

+ References

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

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
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