Intangible Assets and Goodwill - Summary of Goodwill by Business Segment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Goodwill [Line Items]
Balance at December 31, 2014	$ 44,962	$ 44,545
Acquisitions	9,448	417
Impairment	(368)
Balance at December 31, 2015	54,042	44,962
Metropolitan Banks [Member]
Goodwill [Line Items]
Balance at December 31, 2014	8,078	8,078
Balance at December 31, 2015	8,078	8,078
Community Banks [Member]
Goodwill [Line Items]
Balance at December 31, 2014	30,970	30,553
Acquisitions	9,448	417
Impairment	(368)
Balance at December 31, 2015	40,050	30,970
Other Financial Services [Member]
Goodwill [Line Items]
Balance at December 31, 2014	5,464	5,464
Balance at December 31, 2015	5,464	5,464
Executive, Operations & Support [Member]
Goodwill [Line Items]
Balance at December 31, 2014	450	450
Balance at December 31, 2015	$ 450	$ 450