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Investment Securities - Temporarily Impaired Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016
Schedule of Available-for-sale Securities [Line Items]
Fair Value (Estimated) (Less than 12 months)	$ 194,691	$ 276,518	$ 92,794
Unrealized Losses (Less than 12 months)	(3,018)	(7,383)	(640)
Fair Value (Estimated) (12 months or more)	60,608	3,033	2,514
Unrealized Losses (12 months or more)	(1,760)	(191)	(95)
Fair Value (Estimated)	255,299	279,551	95,308
Unrealized Losses	(4,778)	(7,574)	(735)
U.S. Government-sponsored agencies
Schedule of Available-for-sale Securities [Line Items]
Fair Value (Estimated) (Less than 12 months)	7,958	6,642
Unrealized Losses (Less than 12 months)	(197)	(233)
Fair Value (Estimated) (12 months or more)	0	0
Unrealized Losses (12 months or more)	0	0
Fair Value (Estimated)	7,958	6,642
Unrealized Losses	(197)	(233)
Mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Fair Value (Estimated) (Less than 12 months)	147,326	197,528	79,118
Unrealized Losses (Less than 12 months)	(1,635)	(3,090)	(468)
Fair Value (Estimated) (12 months or more)	48,015	2,905	2,407
Unrealized Losses (12 months or more)	(1,106)	(184)	(79)
Fair Value (Estimated)	195,341	200,433	81,525
Unrealized Losses	(2,741)	(3,274)	(547)
State and political subdivisions
Schedule of Available-for-sale Securities [Line Items]
Fair Value (Estimated) (Less than 12 months)	39,407	72,348	13,666
Unrealized Losses (Less than 12 months)	(1,186)	(4,060)	(170)
Fair Value (Estimated) (12 months or more)	12,583	0	0
Unrealized Losses (12 months or more)	(652)	0	0
Fair Value (Estimated)	51,990	72,348	13,666
Unrealized Losses	(1,838)	(4,060)	(170)
Other equity securities
Schedule of Available-for-sale Securities [Line Items]
Fair Value (Estimated) (Less than 12 months)	0	0	10
Unrealized Losses (Less than 12 months)	0	0	(2)
Fair Value (Estimated) (12 months or more)	10	128	107
Unrealized Losses (12 months or more)	(2)	(7)	(16)
Fair Value (Estimated)	10	128	117
Unrealized Losses	$ (2)	$ (7)	$ (18)

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Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer.

+ References

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