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Investment Securities Amortized Cost and Estimated Fair Value of Available for Sale Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 235,174	$ 221,311	$ 212,294
Unrealized Gains	6,422	2,758	3,107
Unrealized Losses	(269)	(1,030)	(1,587)
Fair Value (Estimated)	241,327	223,039	213,814
U.S. Government-sponsored agencies
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	522
Unrealized Gains	0
Unrealized Losses	0
Fair Value (Estimated)	522
Mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	214,303	194,563	184,787
Unrealized Gains	5,274	1,509	2,040
Unrealized Losses	(224)	(962)	(1,235)
Fair Value (Estimated)	219,353	195,110	185,592
State and political subdivisions
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	17,315	23,367	24,378
Unrealized Gains	1,100	1,201	1,006
Unrealized Losses	0	(62)	(344)
Fair Value (Estimated)	18,415	24,506	25,040
Other equity securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,034	3,381	3,129
Unrealized Gains	48	48	61
Unrealized Losses	(45)	(6)	(8)
Fair Value (Estimated)	$ 3,037	$ 3,423	$ 3,182

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

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