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Income Taxes (Details 1) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2017		Sep. 30, 2017	[1]	Jun. 30, 2017	[1]	Mar. 31, 2017	[1]	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 Reconciliation, Amount [Abstract]
Statutory tax													$ 11,474	$ 9,815	$ 3,694
Effect of nontaxable interest													(2,054)	(1,684)	(1,403)
Bank owned life insurance, net													(291)	(283)	(242)
Tax credits													(371)	(367)	(236)
Effect of nontaxable insurance premiums													(348)	(143)	0
Impact of enactment of federal tax reform	$ 1,800												1,793	0	0
Nondeductible acquisition costs													70	40	401
Other													(204)	107	285
TOTALS	$ 4,084	[1]	$ 2,009		$ 2,004		$ 1,972		$ 2,014	$ 1,967	$ 1,833	$ 1,671	$ 10,069	$ 7,485	$ 2,499
[1] Income tax expense for the fourth quarter was elevated due to the additional $1.8 million of tax expense from the re-measurement of the Company’s net deferred tax asset.

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