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Investment Securities Amortized Cost and Estimated Fair Value of Available for Sale Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 212,366	$ 181,380	$ 189,033
Unrealized Gains	4,065	4,567	3,947
Unrealized Losses	(498)	(686)	(2,060)
Fair Value (Estimated)	215,933	185,261	190,920
Mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	184,865	149,796	157,420
Unrealized Gains	2,921	2,637	2,109
Unrealized Losses	(276)	(578)	(1,779)
Fair Value (Estimated)	187,510	151,855	157,750
State and political subdivisions
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	24,372	29,094	29,099
Unrealized Gains	1,104	1,865	1,785
Unrealized Losses	(186)	(104)	(265)
Fair Value (Estimated)	25,290	30,855	30,619
Other equity securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,129	2,490	2,514
Unrealized Gains	40	65	53
Unrealized Losses	(36)	(4)	(16)
Fair Value (Estimated)	$ 3,133	$ 2,551	$ 2,551

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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