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Securities (Summary of Book Values and Fair Values of Investment Securities) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016
Securities available for sale:
Amortized Cost	$ 216,480	$ 202,414
Fair Value	214,743	199,329	$ 247,140
Unrealized Gains	514	342
Unrealized (Losses)	(2,251)	(3,427)
Securities held to maturity:
Amortized Cost	133,254	129,713	148,485
Fair Value	134,185	130,195	$ 151,684
Unrealized Gains	1,897	1,815
Unrealized (Losses)	(966)	(1,333)
Government-sponsored enterprise securities [Member]
Securities available for sale:
Amortized Cost	19,498	17,497
Fair Value	19,426	17,490
Unrealized Gains	8
Unrealized (Losses)	(80)	(7)
Mortgage-backed securities [Member]
Securities available for sale:
Amortized Cost	162,660	151,001
Fair Value	160,786	148,065
Unrealized Gains	220	155
Unrealized (Losses)	(2,094)	(3,091)
Securities held to maturity:
Amortized Cost	76,201	80,585
Fair Value	75,264	79,283
Unrealized Gains
Unrealized (Losses)	(937)	(1,302)
Corporate bonds [Member]
Securities available for sale:
Amortized Cost	34,322	33,833
Fair Value	34,531	33,600
Unrealized Gains	286	91
Unrealized (Losses)	(77)	(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	57,053	49,128
Fair Value	58,921	50,912
Unrealized Gains	1,897	1,815
Unrealized (Losses)	$ (29)	$ (31)

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