Intangible Assets - Summary of Goodwill By Business Segment (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Goodwill [Line Items]
Balance at beginning of period	$ 44,545	$ 44,545
Acquisitions	417
Balance at end of period	44,962	44,545
Metropolitan Banks [Member]
Goodwill [Line Items]
Balance at beginning of period	8,079
Acquisitions	0
Balance at end of period	8,079
Community Banks [Member]
Goodwill [Line Items]
Balance at beginning of period	30,552
Acquisitions	417
Balance at end of period	30,969
Other Financial Services [Member]
Goodwill [Line Items]
Balance at beginning of period	5,464
Acquisitions	0
Balance at end of period	5,464
Executive, Operations & Support [Member]
Goodwill [Line Items]
Balance at beginning of period	450
Acquisitions	0
Balance at end of period	$ 450