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Investment Securities - Temporarily Impaired Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016
Schedule of Available-for-sale Securities [Line Items]
Fair Value (Estimated) (Less than 12 months)	$ 234,959	$ 276,518	$ 21,984
Unrealized Losses (Less than 12 months)	(4,910)	(7,383)	(183)
Fair Value (Estimated) (12 months or more)	7,652	3,033	2,708
Unrealized Losses (12 months or more)	(200)	(191)	(110)
Fair Value (Estimated)	242,611	279,551	24,692
Unrealized Losses	(5,110)	(7,574)	(293)
U.S. Government-sponsored agencies
Schedule of Available-for-sale Securities [Line Items]
Fair Value (Estimated) (Less than 12 months)	7,972	6,642
Unrealized Losses (Less than 12 months)	(181)	(233)
Fair Value (Estimated) (12 months or more)	0	0
Unrealized Losses (12 months or more)	0	0
Fair Value (Estimated)	7,972	6,642
Unrealized Losses	(181)	(233)
Mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Fair Value (Estimated) (Less than 12 months)	170,966	197,528	21,849
Unrealized Losses (Less than 12 months)	(2,613)	(3,090)	(168)
Fair Value (Estimated) (12 months or more)	7,643	2,905	2,615
Unrealized Losses (12 months or more)	(197)	(184)	(80)
Fair Value (Estimated)	178,609	200,433	24,464
Unrealized Losses	(2,810)	(3,274)	(248)
State and political subdivisions
Schedule of Available-for-sale Securities [Line Items]
Fair Value (Estimated) (Less than 12 months)	55,952	72,348
Unrealized Losses (Less than 12 months)	(2,115)	(4,060)
Fair Value (Estimated) (12 months or more)	0	0
Unrealized Losses (12 months or more)	0	0
Fair Value (Estimated)	55,952	72,348
Unrealized Losses	(2,115)	(4,060)
Other equity securities
Schedule of Available-for-sale Securities [Line Items]
Fair Value (Estimated) (Less than 12 months)	69	0	135
Unrealized Losses (Less than 12 months)	(1)	0	(15)
Fair Value (Estimated) (12 months or more)	9	128	93
Unrealized Losses (12 months or more)	(3)	(7)	(30)
Fair Value (Estimated)	78	128	228
Unrealized Losses	$ (4)	$ (7)	$ (45)

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-Publisher FASB
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