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Investment Securities Temporarily Impaired Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015
Schedule of Available-for-sale Securities [Line Items]
Fair Value (Estimated) (Less than 12 months)	$ 92,794	$ 168,818	$ 92,015
Unrealized Loss (Less than 12 months)	(640)	(2,525)	(1,522)
Fair Value (Estimated) (12 months or more)	2,514	21,048	20,858
Unrealized Loss (12 months or more)	(95)	(950)	(751)
Fair Value (Estimated)	95,308	189,866	112,873
Unrealized Losses	(735)	(3,475)	(2,273)
Mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Fair Value (Estimated) (Less than 12 months)	79,118	120,915	30,713
Unrealized Loss (Less than 12 months)	(468)	(1,027)	(266)
Fair Value (Estimated) (12 months or more)	2,407	910	989
Unrealized Loss (12 months or more)	(79)	(71)	(63)
Fair Value (Estimated)	81,525	121,825	31,702
Unrealized Losses	(547)	(1,098)	(329)
State and political subdivisions
Schedule of Available-for-sale Securities [Line Items]
Fair Value (Estimated) (Less than 12 months)	13,666	2,528	14,417
Unrealized Loss (Less than 12 months)	(170)	(24)	(207)
Fair Value (Estimated) (12 months or more)	0	2,901	2,374
Unrealized Loss (12 months or more)	0	(63)	(130)
Fair Value (Estimated)	13,666	5,429	16,791
Unrealized Losses	(170)	(87)	(337)
Other equity securities
Schedule of Available-for-sale Securities [Line Items]
Fair Value (Estimated) (Less than 12 months)	10	64	264
Unrealized Loss (Less than 12 months)	(2)	(5)	(34)
Fair Value (Estimated) (12 months or more)	107	52	51
Unrealized Loss (12 months or more)	(16)	(1)	(2)
Fair Value (Estimated)	117	116	315
Unrealized Losses	$ (18)	(6)	(36)
U.S. Government-sponsored agencies
Schedule of Available-for-sale Securities [Line Items]
Fair Value (Estimated) (Less than 12 months)		45,311	46,621
Unrealized Loss (Less than 12 months)		(1,469)	(1,015)
Fair Value (Estimated) (12 months or more)		17,185	17,444
Unrealized Loss (12 months or more)		(815)	(556)
Fair Value (Estimated)		62,496	64,065
Unrealized Losses		$ (2,284)	$ (1,571)

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