Income Taxes	3 Months Ended
Mar. 31, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Note 7—Income Taxes Income tax expense was $6,245,000 for the first quarter of 2018 as compared to $7,605,000 for the same period in 2017. The Company’s effective tax rates on pretax income were 15.32% and 22.23% for the first quarters of 2018 and 2017, respectively. The effective tax rates differ from the statutory federal tax rate of 21% for 2018 and 35% for 2017 primarily due to tax exempt interest income earned on certain investment securities and loans, the deductibility of dividends paid to our employee stock ownership plan and excess tax benefits related to our directors’ deferred compensation plan. On December 22, 2017, the Tax Cuts and Jobs Act was signed into law with sweeping modifications to the Internal Revenue Service Code. The primary change for the Company was to lower the corporate income tax rate to 21% from 35%. The Company’s deferred tax assets and liabilities were re-measured based on the income tax rules at which they are expected to reverse in the future, which is now generally 21%. The Company continues to analyze certain aspects of the Act resulting in refinement of the calculations which could potentially affect the measurement of these balances or potentially give rise to new deferred tax amounts. The provisional amount recorded related to the re-measurement of the Company’s deferred tax balance was $7,650,000, and was recorded in December 2017 as a reduction of income tax expense. There were no adjustments to this provisional amount recorded in the three months ended March 31, 2018. In addition, income tax rate changes in deferred tax assets and liabilities totaling $5,759,000 related to amounts recorded in accumulated other comprehensive income were reclassified from accumulated other comprehensive income to retained earnings during the first quarter of 2018.

Note 7—Income Taxes

Income tax expense was $6,245,000 for the first quarter of 2018 as compared to $7,605,000 for the same period in 2017. The Company’s effective tax rates on pretax income were 15.32% and 22.23% for the first quarters of 2018 and 2017, respectively. The effective tax rates differ from the statutory federal tax rate of 21% for 2018 and 35% for 2017 primarily due to tax exempt interest income earned on certain investment securities and loans, the deductibility of dividends paid to our employee stock ownership plan and excess tax benefits related to our directors’ deferred compensation plan.

On December 22, 2017, the Tax Cuts and Jobs Act was signed into law with sweeping modifications to the Internal Revenue Service Code. The primary change for the Company was to lower the corporate income tax rate to 21% from 35%. The Company’s deferred tax assets and liabilities were re-measured based on the income tax rules at which they are expected to reverse in the future, which is now generally 21%. The Company continues to analyze certain aspects of the Act resulting in refinement of the calculations which could potentially affect the measurement of these balances or potentially give rise to new deferred tax amounts. The provisional amount recorded related to the re-measurement of the Company’s deferred tax balance was $7,650,000, and was recorded in December 2017 as a reduction of income tax expense. There were no adjustments to this provisional amount recorded in the three months ended March 31, 2018. In addition, income tax rate changes in deferred tax assets and liabilities totaling $5,759,000 related to amounts recorded in accumulated other comprehensive income were reclassified from accumulated other comprehensive income to retained earnings during the first quarter of 2018.