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Income Taxes - Effective Income Tax Reconciliation (Details)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Effective Income Tax Rate Reconciliation, Percent
Federal statutory income tax rate	35.00%	35.00%	35.00%
California franchise tax, net of federal tax benefit	6.80%	6.80%	6.50%
Tax exempt interest on municipal securities and loans	(4.20%)	(3.30%)	(4.00%)
Tax exempt earnings on bank owned life insurance	(1.00%)	(0.90%)	(1.50%)
Low income housing tax credits	(0.20%)	(0.10%)	(0.30%)
Other	(0.10%)	(0.30%)	0.00%
Effective Tax Rate	36.30%	37.20%	35.70%

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Effective Income Tax Rate Reconciliation, Tax Credit, Affordable Housing

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Effective Income Tax Rate Reconciliation, Tax Exempt Income, Interest on Municipal Securities and Loans

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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-Publisher FASB
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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other adjustments.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

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