Commitments, Contingencies and Derivatives (Additional Information) (Details)	12 Months Ended
	Dec. 31, 2017 USD ($) swap	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Legal Proceedings [Line Items]
Loss Contingency Accrual	$ 0	$ 0
Derivative, Number of Interest Rate Swap Agreements | swap	2
Loss on Cash Flow Hedge Ineffectiveness	$ 0	0	$ 0
Unrealized Gain (Loss) on Derivatives	37,000	(289,000)
Expected reclassification of interest expense	936,000
Interest Rate Swap [Member]
Legal Proceedings [Line Items]
Notional amount of derivative	43,000,000	43,000,000
Net payments to counterparty	1,300,000	1,500,000	1,700,000
Cash held as collateral	8,100,000
Derivative, Fair Value, Net		(7,571,000)	(8,372,000)
Forward-Starting Interest Rate Swap [Member]
Legal Proceedings [Line Items]
Notional amount of derivative	50,000,000	50,000,000
Net payments to counterparty	288,000	490,000
Derivative, Fair Value, Net	21,000	(389,000)
Interest Rate Lock Commitments [Member]
Legal Proceedings [Line Items]
Notional amount of derivative	21,746,000	15,249,000
Derivative, Fair Value, Net	285,000	187,000
Unrealized Gain (Loss) on Derivatives	98,000	48,000	139,000
Forward Contracts [Member]
Legal Proceedings [Line Items]
Notional amount of derivative	8,065,000	15,125,000
Derivative, Fair Value, Net	142,000	278,000
Unrealized Gain (Loss) on Derivatives	(136,000)	278,000	$ 0
Loans [Member] | Interest Rate Swap [Member]
Legal Proceedings [Line Items]
Notional amount of derivative	703,336,000	532,526,000
Derivative, Fair Value, Net	$ 0	$ 0