Acquisitions San Diego Trust Bank Acquisition - Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Jun. 25, 2013	Jun. 25, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Business Acquisition [Line Items]
Goodwill			$ 50,832	$ 22,950	$ 17,428
San Diego Trust Bank
Business Acquisition [Line Items]
Cash and cash equivalents	$ 30,252	$ 30,252
Investment securities	124,805	124,805
Loans	42,722	42,722
Allowance for loan losses	0	0
Other real estate owned	752	752
Core deposit intangible	2,836	2,836
Other assets	9,856	9,856
Total assets acquired	211,223	211,223
Deposits	183,907	183,907
Deferred tax liability (asset)	1,174	1,174
Other liabilities	1,094	1,094
Total liabilities assumed	186,175	186,175
Excess of assets acquired over liabilities assumed	25,048	25,048
Consideration paid	30,600	30,622
Goodwill	5,574	5,574	$ 5,600
As initially reported | San Diego Trust Bank
Business Acquisition [Line Items]
Cash and cash equivalents	30,252	30,252
Investment securities	124,960	124,960
Loans	42,945	42,945
Allowance for loan losses	(1,013)	(1,013)
Other real estate owned	752	752
Core deposit intangible	0	0
Other assets	9,856	9,856
Total assets acquired	207,752	207,752
Deposits	183,901	183,901
Deferred tax liability (asset)	(333)	(333)
Other liabilities	1,823	1,823
Total liabilities assumed	185,391	185,391
Excess of assets acquired over liabilities assumed	22,361	22,361
Fair Value Adjustments | San Diego Trust Bank
Business Acquisition [Line Items]
Cash and cash equivalents	0	0
Investment securities	(155)	(155)
Loans	(223)	(223)
Allowance for loan losses	1,013	1,013
Other real estate owned	0	0
Core deposit intangible	2,836	2,836
Other assets	0	0
Total assets acquired	3,471	3,471
Deposits	6	6
Deferred tax liability (asset)	1,507	1,507
Other liabilities	(729)	(729)
Total liabilities assumed	784	784
Excess of assets acquired over liabilities assumed	$ 2,687	$ 2,687