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Securities (Summary of Book Values and Fair Values of Investment Securities) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016
Securities available for sale:
Amortized Cost	$ 207,244	$ 202,414
Fair Value	207,496	199,329	$ 219,762
Unrealized Gains	1,304	342
Unrealized (Losses)	(1,052)	(3,427)
Securities held to maturity:
Amortized Cost	127,866	129,713	142,073
Fair Value	129,697	130,195	$ 146,099
Unrealized Gains	2,100	1,815
Unrealized (Losses)	(269)	(1,333)
Government-sponsored enterprise securities [Member]
Securities available for sale:
Amortized Cost	16,498	17,497
Fair Value	16,498	17,490
Unrealized Gains	7
Unrealized (Losses)	(7)	(7)
Mortgage-backed securities [Member]
Securities available for sale:
Amortized Cost	156,934	151,001
Fair Value	156,601	148,065
Unrealized Gains	647	155
Unrealized (Losses)	(980)	(3,091)
Securities held to maturity:
Amortized Cost	72,257	80,585
Fair Value	72,005	79,283
Unrealized Gains	10
Unrealized (Losses)	(262)	(1,302)
Corporate bonds [Member]
Securities available for sale:
Amortized Cost	33,812	33,833
Fair Value	34,397	33,600
Unrealized Gains	650	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	55,609	49,128
Fair Value	57,692	50,912
Unrealized Gains	2,090	1,815
Unrealized (Losses)	$ (7)	$ (31)

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