Mergers and Acquisitions (Amounts Recorded On Consolidated Balance Sheet In Conjunction With Acquisition) (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Common stock issued, net of offering costs	$ 136,441
Warrant assumed	4,459
Total consideration paid	140,900
Cash and cash equivalents	203,538
Securities	486,186
Loans	919,480
Other intangible assets	16,033
Accrued income and other assets	118,648
Total identifiable assets acquired	1,743,885
Deposits	1,525,253
Borrowings	171,606
Accrued expenses and other liabilities	12,728
Total liabilities assumed	1,709,587
Fair value of net identifiable assets acquired	34,298
Goodwill recognized	$ 106,602