Intangible Assets - Summary of Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Schedule Of Intangible Assets [Line Items]
Gross Carrying Amount	$ 17,380	$ 21,312
Accumulated Amortization	(7,107)	(9,229)
Net Carrying Amount	10,273	12,083
Core deposit intangibles [Member]
Schedule Of Intangible Assets [Line Items]
Gross Carrying Amount	10,963	14,800
Accumulated Amortization	(4,620)	(7,142)
Net Carrying Amount	6,343	7,658
Customer relationship intangibles [Member]
Schedule Of Intangible Assets [Line Items]
Gross Carrying Amount	5,699	5,657
Accumulated Amortization	(2,337)	(1,986)
Net Carrying Amount	3,362	3,671
Mortgage servicing intangibles [Member]
Schedule Of Intangible Assets [Line Items]
Gross Carrying Amount	718	855
Accumulated Amortization	(150)	(101)
Net Carrying Amount	$ 568	$ 754