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Investment Securities Temporarily Impaired Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Fair Value (Estimated) (Less than 12 months)	$ 17,882	$ 168,818	$ 67,483
Unrealized Loss (Less than 12 months)	(176)	(2,525)	(1,052)
Fair Value (Estimated) (12 months or more)	8,282	21,048	12,609
Unrealized Loss (12 months or more)	(213)	(950)	(361)
Fair Value (Estimated)	26,164	189,866	80,092
Unrealized Losses	(389)	(3,475)	(1,413)
U.S. Government-sponsored agencies
Schedule of Available-for-sale Securities [Line Items]
Fair Value (Estimated) (Less than 12 months)	0	45,311	36,459
Unrealized Loss (Less than 12 months)	0	(1,469)	(595)
Fair Value (Estimated) (12 months or more)	4,893	17,185	10,903
Unrealized Loss (12 months or more)	(107)	(815)	(317)
Fair Value (Estimated)	4,893	62,496	47,362
Unrealized Losses	(107)	(2,284)	(912)
Mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Fair Value (Estimated) (Less than 12 months)	17,125	120,915	20,634
Unrealized Loss (Less than 12 months)	(170)	(1,027)	(256)
Fair Value (Estimated) (12 months or more)	1,866	910	65
Unrealized Loss (12 months or more)	(70)	(71)	(2)
Fair Value (Estimated)	18,991	121,825	20,699
Unrealized Losses	(240)	(1,098)	(258)
State and political subdivisions
Schedule of Available-for-sale Securities [Line Items]
Fair Value (Estimated) (Less than 12 months)	522	2,528	10,390
Unrealized Loss (Less than 12 months)	0	(24)	(201)
Fair Value (Estimated) (12 months or more)	1,417	2,901	1,641
Unrealized Loss (12 months or more)	(19)	(63)	(42)
Fair Value (Estimated)	1,939	5,429	12,031
Unrealized Losses	(19)	(87)	$ (243)
Other equity securities
Schedule of Available-for-sale Securities [Line Items]
Fair Value (Estimated) (Less than 12 months)	235	64
Unrealized Loss (Less than 12 months)	(6)	(5)
Fair Value (Estimated) (12 months or more)	106	52
Unrealized Loss (12 months or more)	(17)	(1)
Fair Value (Estimated)	341	116
Unrealized Losses	$ (23)	$ (6)

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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