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Securities (Summary of Book Values and Fair Values of Investment Securities) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015
Securities available for sale:
Amortized Cost	$ 197,192	$ 166,778
Fair Value	199,156	165,614	$ 178,765
Unrealized Gains	2,360	413
Unrealized (Losses)	(396)	(1,577)
Securities held to maturity:
Amortized Cost	135,808	154,610	160,048
Fair Value	139,514	157,146	$ 162,858
Unrealized Gains	3,706	3,284
Unrealized (Losses)		(748)
Government-sponsored enterprise securities [Member]
Securities available for sale:
Amortized Cost	3,000	19,000
Fair Value	2,999	18,972
Unrealized Gains		1
Unrealized (Losses)	(1)	(29)
Mortgage-backed securities [Member]
Securities available for sale:
Amortized Cost	160,267	122,474
Fair Value	161,443	121,553
Unrealized Gains	1,441	348
Unrealized (Losses)	(265)	(1,269)
Securities held to maturity:
Amortized Cost	86,463	102,509
Fair Value	87,249	101,767
Unrealized Gains	786
Unrealized (Losses)		(742)
Corporate bonds [Member]
Securities available for sale:
Amortized Cost	33,842	25,216
Fair Value	34,571	24,946
Unrealized Gains	852
Unrealized (Losses)	(123)	(270)
Equity securities [Member]
Securities available for sale:
Amortized Cost	83	88
Fair Value	143	143
Unrealized Gains	67	64
Unrealized (Losses)	(7)	(9)
State and local governments [Member]
Securities held to maturity:
Amortized Cost	49,345	52,101
Fair Value	52,265	55,379
Unrealized Gains	2,920	3,284
Unrealized (Losses)		$ (6)

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