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Subordinated Debentures - Narrative (Details) (USD $)	9 Months Ended
Subordinated Debentures - Narrative (Details) (USD $)	Sep. 30, 2014	Sep. 30, 2014 Other assets	Dec. 31, 2013 Other assets	Sep. 30, 2014 Trust Preferred Securities Subject to Mandatory Redemption	Sep. 30, 2014 Maximum Trust Preferred Securities Subject to Mandatory Redemption	Sep. 30, 2014 Nara Bancorp Grantor Trust grantor_trust	Sep. 30, 2014 Nara Bancorp Grantor Trust Trust Preferred Securities Subject to Mandatory Redemption	Sep. 30, 2014 Center Financial Corporation Grantor Trust grantor_trust	Sep. 30, 2014 Center Financial Corporation Grantor Trust Trust Preferred Securities Subject to Mandatory Redemption	Sep. 30, 2014 PIB Trust I grantor_trust	Sep. 30, 2014 PIB Trust I Trust Preferred Securities Subject to Mandatory Redemption	Sep. 30, 2014 Foster Capital Trust I grantor_trust	Sep. 30, 2014 Foster Capital Trust I Trust Preferred Securities Subject to Mandatory Redemption
Subordinated Borrowing [Line Items]
Number of grantor trusts issuing securities						4		1		1		1
Trust Preferred Security Amount				$ 46,000,000			$ 28,000,000		$ 18,000,000		$ 4,000,000		$ 15,000,000
Right to defer consecutive payments of interest, maximum term	5 years
Investment in common trust securities		1,600,000	1,900,000
Percent included in tier one capital, maximum				25.00%
Excess of percent threshold included in tier two capital				25.00%
Tier one risk based capital				$ 40,700,000	$ 15,000,000,000