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Investment Securities Amortized Cost and Estimated Fair Value of Available for Sale Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 212,294	$ 181,380	$ 301,501
Unrealized Gains	3,107	4,567	6,455
Unrealized Losses	(1,587)	(686)	(4,076)
Fair Value (Estimated)	213,814	185,261	303,880
Mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	184,787	149,796	165,978
Unrealized Gains	2,040	2,637	2,417
Unrealized Losses	(1,235)	(578)	(1,692)
Fair Value (Estimated)	185,592	151,855	166,703
State and political subdivisions
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	24,378	29,094	133,327
Unrealized Gains	1,006	1,865	3,951
Unrealized Losses	(344)	(104)	(2,383)
Fair Value (Estimated)	25,040	30,855	134,895
Other equity securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,129	2,490	2,196
Unrealized Gains	61	65	87
Unrealized Losses	(8)	(4)	(1)
Fair Value (Estimated)	$ 3,182	$ 2,551	$ 2,282

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

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