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Securities (Summary of Book Values and Fair Values of Investment Securities) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Securities available for sale:
Amortized Cost	$ 202,414	$ 166,778
Fair Value	199,329	165,614
Unrealized Gain	342	413
Unrealized (Losses)	(3,427)	(1,577)
Securities held to maturity:
Amortized Cost	129,713	154,610
Fair Value	130,195	157,146
Unrealized Gain	1,815	3,284
Unrealized (Losses)	(1,333)	(748)
Government-sponsored enterprise securities [Member]
Securities available for sale:
Amortized Cost	17,497	19,000
Fair Value	17,490	18,972
Unrealized Gain		1
Unrealized (Losses)	(7)	(29)
Mortgage-backed securities [Member]
Securities available for sale:
Amortized Cost	151,001	122,474
Fair Value	148,065	121,553
Unrealized Gain	155	348
Unrealized (Losses)	(3,091)	(1,269)
Securities held to maturity:
Amortized Cost	80,585	102,509
Fair Value	79,283	101,767
Unrealized Gain
Unrealized (Losses)	(1,302)	(742)
Corporate bonds [Member]
Securities available for sale:
Amortized Cost	33,833	25,216
Fair Value	33,600	24,946
Unrealized Gain	91
Unrealized (Losses)	(324)	(270)
Equity securities [Member]
Securities available for sale:
Amortized Cost	83	88
Fair Value	174	143
Unrealized Gain	96	64
Unrealized (Losses)	(5)	(9)
State and local governments [Member]
Securities held to maturity:
Amortized Cost	49,128	52,101
Fair Value	50,912	55,379
Unrealized Gain	1,815	3,284
Unrealized (Losses)	$ (31)	$ (6)

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