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Investment Securities - Amortized Cost and Estimated Fair Value of Available for Sale Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 300,268	$ 301,854	$ 278,126
Unrealized Gains	1,480	1,872	4,698
Unrealized Losses	(2,749)	(3,310)	(531)
Fair Value (Estimated)	298,999	300,416	282,293
Mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	290,151	282,397	258,179
Unrealized Gains	1,339	1,334	3,848
Unrealized Losses	(2,701)	(3,127)	(513)
Fair Value (Estimated)	288,789	280,604	261,514
State and political subdivisions
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	6,860	16,183	16,689
Unrealized Gains	28	475	795
Unrealized Losses	(46)	(176)	0
Fair Value (Estimated)	6,842	16,482	17,484
Other equity securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,257	3,274	3,258
Unrealized Gains	113	63	55
Unrealized Losses	(2)	(7)	(18)
Fair Value (Estimated)	$ 3,368	$ 3,330	$ 3,295

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

+ References

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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