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Intangible Assets and Goodwill - Summary of Goodwill by Business Segment (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)
Goodwill [Line Items]
Balance at beginning of period	$ 54,042
Acquisitions	25,707
Balance at end of period	79,749
Metropolitan Banks [Member]
Goodwill [Line Items]
Balance at beginning of period	8,078
Acquisitions	5,689
Balance at end of period	13,767
Community Banks [Member]
Goodwill [Line Items]
Balance at beginning of period	39,876
Acquisitions	20,018
Balance at end of period	59,894
Other Financial Services [Member]
Goodwill [Line Items]
Balance at beginning of period	5,464
Balance at end of period	5,464
Executive, Operations & Support [Member]
Goodwill [Line Items]
Balance at beginning of period	624
Balance at end of period	$ 624

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

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-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
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+ References

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