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Investment Securities Temporarily Impaired Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Fair Value (Estimated) (Less than 12 months)	$ 287,408	$ 276,518	$ 17,882
Unrealized Loss (Less than 12 months)	(7,644)	(7,383)	(176)
Fair Value (Estimated) (12 months or more)	2,494	3,033	8,282
Unrealized Loss (12 months or more)	(150)	(191)	(213)
Fair Value (Estimated)	289,902	279,551	26,164
Unrealized Losses	(7,794)	(7,574)	(389)
U.S. Government-sponsored agencies
Schedule of Available-for-sale Securities [Line Items]
Fair Value (Estimated) (Less than 12 months)	10,824	6,642	0
Unrealized Loss (Less than 12 months)	(317)	(233)	0
Fair Value (Estimated) (12 months or more)	0	0	4,893
Unrealized Loss (12 months or more)	0	0	(107)
Fair Value (Estimated)	10,824	6,642	4,893
Unrealized Losses	(317)	(233)	(107)
Mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Fair Value (Estimated) (Less than 12 months)	198,068	197,528	17,125
Unrealized Loss (Less than 12 months)	(3,193)	(3,090)	(170)
Fair Value (Estimated) (12 months or more)	2,432	2,905	1,866
Unrealized Loss (12 months or more)	(146)	(184)	(70)
Fair Value (Estimated)	200,500	200,433	18,991
Unrealized Losses	(3,339)	(3,274)	(240)
State and political subdivisions
Schedule of Available-for-sale Securities [Line Items]
Fair Value (Estimated) (Less than 12 months)	78,516	72,348	522
Unrealized Loss (Less than 12 months)	(4,134)	(4,060)	0
Fair Value (Estimated) (12 months or more)	0	0	1,417
Unrealized Loss (12 months or more)	0	0	(19)
Fair Value (Estimated)	78,516	72,348	1,939
Unrealized Losses	(4,134)	(4,060)	(19)
Other equity securities
Schedule of Available-for-sale Securities [Line Items]
Fair Value (Estimated) (Less than 12 months)	0	0	235
Unrealized Loss (Less than 12 months)	0	0	(6)
Fair Value (Estimated) (12 months or more)	62	128	106
Unrealized Loss (12 months or more)	(4)	(7)	(17)
Fair Value (Estimated)	62	128	341
Unrealized Losses	$ (4)	$ (7)	$ (23)

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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