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Income Taxes - Reconciliation of Income Tax Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Income Tax Disclosure [Abstract]        
Computed at the statutory rate $ 14,143 $ 11,944 $ 27,851 $ 23,078
State income taxes, net of federal tax benefit 1,265 236 3,087 775
Discrete items related to ASU 2016-09 (90) (295) (363) (1,377)
Tax exempt interest income (782) (1,134) (1,459) (2,205)
Tax exempt earnings on BOLI (190) (220) (376) (438)
Other differences, net (563) 529 (991) 918
Provision for income taxes $ 13,783 $ 11,060 $ 27,749 $ 20,751