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Securities (Summary of Book Values and Fair Values of Investment Securities) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016
Securities available for sale:
Amortized Cost	$ 198,486	$ 202,414
Fair Value	198,924	199,329	$ 199,156
Unrealized Gains	1,374	342
Unrealized (Losses)	(936)	(3,427)
Securities held to maturity:
Amortized Cost	123,156	129,713	135,808
Fair Value	124,878	130,195	$ 139,514
Unrealized Gains	1,923	1,815
Unrealized (Losses)	(201)	(1,333)
Government-sponsored enterprise securities [Member]
Securities available for sale:
Amortized Cost	9,000	17,497
Fair Value	8,992	17,490
Unrealized Gains	1
Unrealized (Losses)	(9)	(7)
Mortgage-backed securities [Member]
Securities available for sale:
Amortized Cost	155,684	151,001
Fair Value	155,535	148,065
Unrealized Gains	713	155
Unrealized (Losses)	(862)	(3,091)
Securities held to maturity:
Amortized Cost	67,708	80,585
Fair Value	67,529	79,283
Unrealized Gains	15
Unrealized (Losses)	(194)	(1,302)
Corporate bonds [Member]
Securities available for sale:
Amortized Cost	33,802	33,833
Fair Value	34,397	33,600
Unrealized Gains	660	91
Unrealized (Losses)	(65)	(324)
Equity securities [Member]
Securities available for sale:
Amortized Cost		83
Fair Value		174
Unrealized Gains		96
Unrealized (Losses)		(5)
State and local governments [Member]
Securities held to maturity:
Amortized Cost	55,448	49,128
Fair Value	57,349	50,912
Unrealized Gains	1,908	1,815
Unrealized (Losses)	$ (7)	$ (31)

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