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Investment Securities - Amortized Cost and Estimated Fair Value of Available for Sale Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 309,046	$ 301,854	$ 235,174
Unrealized Gains	1,932	1,872	6,422
Unrealized Losses	(2,832)	(3,310)	(269)
Fair Value (Estimated)	308,146	300,416	241,327
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	290,379	282,397	214,303
Unrealized Gains	1,381	1,334	5,274
Unrealized Losses	(2,769)	(3,127)	(224)
Fair Value (Estimated)	288,991	280,604	219,353
State and political subdivisions
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	15,401	16,183	17,315
Unrealized Gains	486	475	1,100
Unrealized Losses	(59)	(176)	0
Fair Value (Estimated)	15,828	16,482	18,415
Other equity securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,266	3,274	3,034
Unrealized Gains	65	63	48
Unrealized Losses	(4)	(7)	(45)
Fair Value (Estimated)	$ 3,327	$ 3,330	$ 3,037

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

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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.

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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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