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Investment Securities Temporarily Impaired Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015
Schedule of Available-for-sale Securities [Line Items]
Fair Value (Estimated) (Less than 12 months)	$ 21,984	$ 168,818	$ 216,760
Unrealized Loss (Less than 12 months)	(183)	(2,525)	(4,477)
Fair Value (Estimated) (12 months or more)	2,708	21,048	20,497
Unrealized Loss (12 months or more)	(110)	(950)	(1,333)
Fair Value (Estimated)	24,692	189,866	237,257
Unrealized Losses	(293)	(3,475)	(5,810)
U.S. Government-sponsored agencies
Schedule of Available-for-sale Securities [Line Items]
Fair Value (Estimated) (Less than 12 months)		45,311	55,147
Unrealized Loss (Less than 12 months)		(1,469)	(1,988)
Fair Value (Estimated) (12 months or more)		17,185	16,953
Unrealized Loss (12 months or more)		(815)	(1,047)
Fair Value (Estimated)		62,496	72,100
Unrealized Losses		(2,284)	(3,035)
Mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Fair Value (Estimated) (Less than 12 months)	21,849	120,915	89,332
Unrealized Loss (Less than 12 months)	(168)	(1,027)	(1,280)
Fair Value (Estimated) (12 months or more)	2,615	910	1,194
Unrealized Loss (12 months or more)	(80)	(71)	(80)
Fair Value (Estimated)	24,464	121,825	90,526
Unrealized Losses	(248)	(1,098)	(1,360)
State and political subdivisions
Schedule of Available-for-sale Securities [Line Items]
Fair Value (Estimated) (Less than 12 months)		2,528	72,217
Unrealized Loss (Less than 12 months)		(24)	(1,202)
Fair Value (Estimated) (12 months or more)		2,901	2,299
Unrealized Loss (12 months or more)		(63)	(205)
Fair Value (Estimated)		5,429	74,516
Unrealized Losses		(87)	(1,407)
Other equity securities
Schedule of Available-for-sale Securities [Line Items]
Fair Value (Estimated) (Less than 12 months)	135	64	64
Unrealized Loss (Less than 12 months)	(15)	(5)	(7)
Fair Value (Estimated) (12 months or more)	93	52	51
Unrealized Loss (12 months or more)	(30)	(1)	(1)
Fair Value (Estimated)	228	116	115
Unrealized Losses	$ (45)	$ (6)	$ (8)

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