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Income Taxes (Reconciliation of Expected Income Tax Benefit Computed Using Federal Statutory Income Tax Rate) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
 [2]
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]                      
Computed tax expense(1) [1]                 $ 13,813 $ 21,824 $ 20,139
Change in federal corporate income tax rate(1) [1]                 0 14,263 0
Tax exempt income                 (741) (1,291) (1,312)
Income from life insurance                 (510) (829) (908)
State taxes, net of federal benefit                 905 630 565
Share-based awards                 (150) (390) (701)
Low income housing credits                 (465) (366) (376)
Other                 (146) 37 65
Income tax expense $ 3,502 $ 3,238 $ 2,887 $ 3,079 $ 19,335 $ 5,478 $ 4,721 $ 4,344 12,706 33,878 17,472
Income before income taxes $ 17,479 $ 17,295 $ 15,104 $ 15,899 $ 16,162 $ 16,817 $ 14,955 $ 14,420 $ 65,777 $ 62,354 $ 57,539
Effective tax rate                 19.30% 54.30% 30.40%
[1] (1)On December 22, 2017, the Tax Act was enacted, reducing the U.S. federal corporate income tax rate from 35.0% to 21.0%. The Company recognized the effect of the tax law changes in the period of enactment, which resulted in a reduction to net deferred tax assets and a corresponding charge to income tax expense of $14.3 million.
[2] (1) In the fourth quarter of 2017, the Company recognized $14.3 million of additional income tax expense upon the revaluation of its deferred tax assets and liabilities upon enactment of the Tax Act on December 22, 2017, which lowered the federal corporate tax rate from 35.0% to 21.0%, effective January 1, 2018. The impact to fourth quarter 2017 basic and diluted EPS was $0.91 per share.