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Income Taxes Income Tax Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Effective Income Tax Rate [Line Items]
Statutory U.S. Federal Tax Rate									35.00%
Expected income taxes									$ 14,604	$ 11,823	$ 9,006
Tax-exempt income from bank owned life insurance									573	235	0
Other tax exempt income									(2,223)	(1,577)	(1,103)
Nondeductible interest expense									28	21	11
State taxes, net of federal taxes									2,062	1,628	1,264
Other items									(266)	280	41
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount									1,410	0	0
Effect of marginal tax rate									0	0	(1)
Total	$ 4,497	$ 3,538	$ 3,927	$ 3,080	$ 3,863	$ 2,812	$ 2,624	$ 2,641	$ 15,042	$ 11,940	$ 9,218

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[Line Items] for Effective Income Tax Rate [Table]

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

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