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Income Taxes - Reconciliation of effective tax rate (Details)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Federal income tax, at statutory rate	34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
State taxes, net of Federal tax benefit	(0.70%)us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.40%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	2.80%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Tax exempt investment security income, net	(42.20%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome	(20.50%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome	(16.70%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome
Bank owned life insurance, net	(3.90%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseLifeInsurance	(1.80%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseLifeInsurance	(1.40%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseLifeInsurance
Solar credits	(2.40%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits	(1.40%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits	(1.40%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits
Change in uncertain tax positions	0.00%us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies	(1.40%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies	0.50%us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies
Change in prior year estimates	0.10%us-gaap_EffectiveIncomeTaxRateReconciliationPriorYearIncomeTaxes	1.40%us-gaap_EffectiveIncomeTaxRateReconciliationPriorYearIncomeTaxes	0.00%us-gaap_EffectiveIncomeTaxRateReconciliationPriorYearIncomeTaxes
Other	3.10%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments	3.40%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.50%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Effective tax rate	(12.00%)us-gaap_EffectiveIncomeTaxRateContinuingOperations	14.10%us-gaap_EffectiveIncomeTaxRateContinuingOperations	18.30%us-gaap_EffectiveIncomeTaxRateContinuingOperations

X

- Definition

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

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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 life insurance expense.

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