FDIC Loss Sharing Asset FDIC Loss Sharing Asset (Details1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Schedule of FDIC Loss Sharing Asset [Line Items]
FDIC loss sharing asset	$ 18,734	$ 45,524	$ 57,475	$ 95,187
True‑up liability	7,186
Non-single family covered assets (1)	231,057
Single family covered assets	98,395
Affinity Bank [Member]
Schedule of FDIC Loss Sharing Asset [Line Items]
FDIC loss sharing asset	(302)
Non-single family covered assets (1)	113,361
Single family covered assets	10,987
Los Padres Bank [Member]
Schedule of FDIC Loss Sharing Asset [Line Items]
FDIC loss sharing asset	9,435
Non-single family covered assets (1)	77,814
Single family covered assets	56,891
Western Commercial Bank [Member]
Schedule of FDIC Loss Sharing Asset [Line Items]
FDIC loss sharing asset	1,165
True‑up liability	1,753
Non-single family covered assets (1)	11,327
San Luis Trust Bank [Member]
Schedule of FDIC Loss Sharing Asset [Line Items]
FDIC loss sharing asset	8,436
True‑up liability	5,433
Non-single family covered assets (1)	28,555
Single family covered assets	$ 30,517