Investment Securities (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014 securities	Sep. 30, 2013	Dec. 31, 2013
Available-for-sale: [Abstract]
Amortized Cost	$ 378,265,000		$ 378,265,000		$ 502,457,000
Gross Unrealized Gains	4,401,000		4,401,000		3,417,000
Gross Unrealized (Losses)	(7,034,000)		(7,034,000)		(17,150,000)
Fair Value	375,632,000		375,632,000		488,724,000
Number Of Trust Preferred Securities Sold			2
Gain (Loss) on Sale of Securities, Net	(20,000)	1,456,000	714,000	2,291,000
Held-to-maturity: [Abstract]
Held-to-maturity Securities	53,594,000		53,594,000		0
Held-to-maturity Securities, Fair Value	53,440,000		53,440,000		0
Realized Investment Gains (Losses) [Abstract]
Gross gains			1,451,000	2,452,000
Gross losses			(737,000)	(161,000)
U.S. Treasury securities and obligations of U.S. government corporations & agencies
Available-for-sale: [Abstract]
Amortized Cost	96,327,000		96,327,000		197,805,000
Gross Unrealized Gains	101,000		101,000		137,000
Gross Unrealized (Losses)	(1,769,000)		(1,769,000)		(7,574,000)
Fair Value	94,659,000		94,659,000		190,368,000
Held-to-maturity: [Abstract]
Held-to-maturity Securities	53,594,000		53,594,000
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	51,000		51,000
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	(205,000)		(205,000)
Held-to-maturity Securities, Fair Value	53,440,000		53,440,000
Available-For-Sale Securities Transferred to Held-To-Maturity, Carrying Value	53,600,000		53,600,000
Available-For-Sale Transfers To Held-To-Maturity, Gross Losses			1,400,000
Obligations of states and political subdivisions
Available-for-sale: [Abstract]
Amortized Cost	72,703,000		72,703,000		65,304,000
Gross Unrealized Gains	2,482,000		2,482,000		1,031,000
Gross Unrealized (Losses)	(189,000)		(189,000)		(1,773,000)
Fair Value	74,996,000		74,996,000		64,562,000
Mortgage-backed securities: GSE residential
Available-for-sale: [Abstract]
Amortized Cost	201,752,000		201,752,000		229,661,000
Gross Unrealized Gains	1,775,000		1,775,000		2,215,000
Gross Unrealized (Losses)	(2,068,000)		(2,068,000)		(4,275,000)
Fair Value	201,459,000		201,459,000		227,601,000
Trust preferred securities
Available-for-sale: [Abstract]
Amortized Cost	3,449,000		3,449,000		3,652,000
Gross Unrealized Gains	0		0		0
Gross Unrealized (Losses)	(2,987,000)		(2,987,000)		(3,461,000)
Fair Value	462,000		462,000		191,000
Number of trust preferred securities			1
Trust preferred securities | Maximum [Member]
Available-for-sale: [Abstract]
Maturities of Debt Securities			twenty-three years
Other securities
Available-for-sale: [Abstract]
Amortized Cost	4,034,000		4,034,000		6,035,000
Gross Unrealized Gains	43,000		43,000		34,000
Gross Unrealized (Losses)	(21,000)		(21,000)		(67,000)
Fair Value	$ 4,056,000		$ 4,056,000		$ 6,002,000