Summary of Acquired Assets and Assumed Liabilities Along with Summary of Acquisition Consideration as of Dates of Acquisition (Detail) (USD $) In Thousands, unless otherwise specified			0 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Jan. 31, 2014 Renovation Ready	Oct. 31, 2013 CS Financial	Sep. 10, 2013 The Palisades Group, LLC	Jun. 30, 2013 Private Bank of California
Assets acquired:
Cash and due from banks				$ 482	$ 900	$ 33,752
Interest-bearing deposits					5
Federal funds sold
Securities available for sale						219,298
Loans held for sale				4,982
Loans and leases receivable						385,256
Federal Home Loan Bank and other bank stock, at cost
Servicing rights
Premises, equipment, and capital leases				1,050		1,501
Income tax receivable						682
Goodwill	32,868	30,143	3,000	8,057		14,763
Other intangible assets						10,400
Other assets				621	364	6,578
Total assets acquired			3,000	15,192	1,269	672,230
Liabilities assumed:
Deposits						561,689
Advances from Federal Home Loan Bank						41,833
Other liabilities			1,000	7,270	1,219	2,481
Total liabilities assumed			1,000	7,270	1,219	606,003
SBLF preferred stock assumed						10,000
Total consideration paid			2,000	7,922	50	56,227
Summary of consideration
Cash paid			1,000	1,500	50	27,915
Common stock issued			1,000	1,964		28,282
Replacement awards						30
Stock warrants issued
Noninterest-bearing note				3,150
Performance based equity				1,308
Earn-out liabilities			$ 1,000