Related Party Transactions (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Related Party Transactions [Abstract]
Loans restructured	$ 0	$ 0	$ 0
Loans past due	0	0	0
Loans on non-accrual status	0	0	$ 0
Activity of loans to related parties [Roll Forward]
Balance at December 31, 2016	22,078,000
Additions	24,265,000
Repayments	(20,589,000)
Reclassifications	(11,533,000)
Balance at December 31, 2017	14,221,000	22,078,000
Related party deposits	$ 22,077,000	$ 22,121,000