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Investment Securities Temporarily Impaired Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014
Schedule of Available-for-sale Securities [Line Items]
Fair Value (Estimated) (Less than 12 months)	$ 92,015	$ 17,298	$ 61,651
Unrealized Loss (Less than 12 months)	(1,522)	(74)	(793)
Fair Value (Estimated) (12 months or more)	20,858	111,694	119,192
Unrealized Loss (12 months or more)	(751)	(2,825)	(7,163)
Fair Value (Estimated)	112,873	128,992	180,843
Unrealized Losses	(2,273)	(2,899)	(7,956)
U.S. Government-sponsored agencies
Schedule of Available-for-sale Securities [Line Items]
Fair Value (Estimated) (Less than 12 months)	46,621	0	4,985
Unrealized Loss (Less than 12 months)	(1,015)	0	(15)
Fair Value (Estimated) (12 months or more)	17,444	79,444	81,253
Unrealized Loss (12 months or more)	(556)	(2,066)	(5,256)
Fair Value (Estimated)	64,065	79,444	86,238
Unrealized Losses	(1,571)	(2,066)	(5,271)
Mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Fair Value (Estimated) (Less than 12 months)	30,713	13,878	52,644
Unrealized Loss (Less than 12 months)	(266)	(40)	(736)
Fair Value (Estimated) (12 months or more)	989	29,182	32,009
Unrealized Loss (12 months or more)	(63)	(654)	(1,630)
Fair Value (Estimated)	31,702	43,060	84,653
Unrealized Losses	(329)	(694)	(2,366)
State and political subdivisions
Schedule of Available-for-sale Securities [Line Items]
Fair Value (Estimated) (Less than 12 months)	14,417	3,352	3,880
Unrealized Loss (Less than 12 months)	(207)	(31)	(27)
Fair Value (Estimated) (12 months or more)	2,374	3,017	5,878
Unrealized Loss (12 months or more)	(130)	(104)	(276)
Fair Value (Estimated)	16,791	6,369	9,758
Unrealized Losses	(337)	(135)	(303)
Other equity securities
Schedule of Available-for-sale Securities [Line Items]
Fair Value (Estimated) (Less than 12 months)	264	68	142
Unrealized Loss (Less than 12 months)	(34)	(3)	(15)
Fair Value (Estimated) (12 months or more)	51	51	52
Unrealized Loss (12 months or more)	(2)	(1)	(1)
Fair Value (Estimated)	315	119	194
Unrealized Losses	$ (36)	$ (4)	$ (16)

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