Investment Securities (Details) (USD $)	3 Months Ended			6 Months Ended
	Jun. 30, 2012	Mar. 31, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Carrying value and fair value of investment securities available for sale [Abstract]
Total available for sale, Amortized cost	$ 351,132,000			$ 351,132,000		$ 323,438,000
Total available for sale, Gross unrealized gains	7,123,000			7,123,000		6,689,000
Total available for sale, Non-OTTI in AOCI	(1,165,000)			(1,165,000)		(1,121,000)
Total available for sale, Non-credit related OTTI in AOCI	0			0		0
Total available for sale securities	357,090,000			357,090,000		329,006,000
Amortized cost [Abstract]
Within 1 year	4,374,000			4,374,000
After 1 but within 5 years	6,199,000			6,199,000
After 5 but within 10 years	4,604,000			4,604,000
After 10 years	44,380,000			44,380,000
Mortgage-backed securities residential	36,369,000			36,369,000
Collateralized mortgage obligations Issued or guaranteed by U.S. government agencies	248,369,000			248,369,000
Collateralized mortgage obligations Non-agency	1,067,000			1,067,000
Total available for sale debt securities	345,362,000			345,362,000
No contractual maturity	5,770,000			5,770,000
Total available for sale securities	351,132,000			351,132,000		323,438,000
Fair value [Abstract]
Within 1 year	4,461,000			4,461,000
After 1 but within 5 years	6,259,000			6,259,000
After 5 but within 10 years	4,345,000			4,345,000
After 10 years	46,040,000			46,040,000
Mortgage-backed securities residential	36,865,000			36,865,000
Collateralized mortgage obligations Issued or guaranteed by U.S. government agencies	252,159,000			252,159,000
Collateralized mortgage obligations Non-agency	998,000			998,000
Total available for sale debt securities	351,127,000			351,127,000
No contractual maturity	5,963,000			5,963,000
Total available for sale securities	357,090,000			357,090,000		329,006,000
Available for sale securities, continuous unrealized loss position [Abstract]
Less than 12 months, Fair value	70,084,000			70,084,000		53,369,000
12 months or longer, Fair value	6,502,000			6,502,000		18,565,000
Total, Fair value	76,586,000			76,586,000		71,934,000
Less than 12 months, Gross unrealized losses	(811,000)			(811,000)		(674,000)
12 months or longer, Gross unrealized losses	(354,000)			(354,000)		(447,000)
Total, Gross unrealized losses	(1,165,000)			(1,165,000)		(1,121,000)
Credit related impairment losses on debt securities held, for portion of OTTI was recognized in other comprehensive income [Roll Forward]
Total OTTI charges	859,000		381,000	859,000	381,000
Balance at beginning of period		173,000		173,000	924,000
Additional credit-related impairment loss on debt securities for which an other-than-temporary impairment was previously recognized				0	334,000
Balance at June 30,	173,000		1,258,000	173,000	1,258,000
Proceeds from sales of AFS investment securities	75,000		26,900,000	11,902,000	70,477,000
Gross realized gains and losses on the sale of securities [Abstract]
Gross realized gains	29,000		1,140,000	340,000	1,727,000
Gross realized losses	(9,000)		(47,000)	(181,000)	(626,000)
Net realized gains	20,000		1,093,000	159,000	1,101,000
Mortgage-backed securities-residential [Member]
Carrying value and fair value of investment securities available for sale [Abstract]
Total available for sale, Amortized cost	36,369,000			36,369,000		16,763,000
Total available for sale, Gross unrealized gains	514,000			514,000		309,000
Total available for sale, Non-OTTI in AOCI	(18,000)			(18,000)		(67,000)
Total available for sale, Non-credit related OTTI in AOCI	0			0		0
Total available for sale securities	36,865,000			36,865,000		17,005,000
Amortized cost [Abstract]
Total available for sale securities	36,369,000			36,369,000		16,763,000
Fair value [Abstract]
Total available for sale securities	36,865,000			36,865,000		17,005,000
Available for sale securities, continuous unrealized loss position [Abstract]
Less than 12 months, Fair value	8,157,000			8,157,000		9,588,000
12 months or longer, Fair value	0			0		0
Total, Fair value	8,157,000			8,157,000		9,588,000
Less than 12 months, Gross unrealized losses	(18,000)			(18,000)		(67,000)
12 months or longer, Gross unrealized losses	0			0		0
Total, Gross unrealized losses	(18,000)			(18,000)		(67,000)
Number of securities	2			2
Gross unrealized losses as percentage of aggregate cost (in hundredths)	0.20%			0.20%
Number of securities in an unrealized loss position for less than twelve months	2			2
U.S. government agencies [Member]
Carrying value and fair value of investment securities available for sale [Abstract]
Total available for sale, Amortized cost	34,979,000			34,979,000		35,966,000
Total available for sale, Gross unrealized gains	207,000			207,000		122,000
Total available for sale, Non-OTTI in AOCI	0			0		(4,000)
Total available for sale, Non-credit related OTTI in AOCI	0			0		0
Total available for sale securities	35,186,000			35,186,000		36,084,000
Amortized cost [Abstract]
Total available for sale securities	34,979,000			34,979,000		35,966,000
Fair value [Abstract]
Total available for sale securities	35,186,000			35,186,000		36,084,000
Available for sale securities, continuous unrealized loss position [Abstract]
Less than 12 months, Fair value						2,999,000
12 months or longer, Fair value						3,996,000
Total, Fair value						6,995,000
Less than 12 months, Gross unrealized losses						(1,000)
12 months or longer, Gross unrealized losses						(3,000)
Total, Gross unrealized losses						(4,000)
Common stock [Member]
Carrying value and fair value of investment securities available for sale [Abstract]
Total available for sale, Amortized cost	33,000			33,000		130,000
Total available for sale, Gross unrealized gains	12,000			12,000		118,000
Total available for sale, Non-OTTI in AOCI	0			0		0
Total available for sale, Non-credit related OTTI in AOCI	0			0		0
Total available for sale securities	45,000			45,000		248,000
Amortized cost [Abstract]
Total available for sale securities	33,000			33,000		130,000
Fair value [Abstract]
Total available for sale securities	45,000			45,000		248,000
Available for sale securities, continuous unrealized loss position [Abstract]
Gain recorded by common stock investment sold		112,000
Number of securities	2			2
Credit related impairment losses on debt securities held, for portion of OTTI was recognized in other comprehensive income [Roll Forward]
Total OTTI charges	0		47,000	0	47,000
Collateralized mortgage obligations, Issued or guaranteed by U.S. government agencies [Member]
Carrying value and fair value of investment securities available for sale [Abstract]
Total available for sale, Amortized cost	248,369,000			248,369,000		231,262,000
Total available for sale, Gross unrealized gains	4,158,000			4,158,000		3,315,000
Total available for sale, Non-OTTI in AOCI	(368,000)			(368,000)		(543,000)
Total available for sale, Non-credit related OTTI in AOCI	0			0		0
Total available for sale securities	252,159,000			252,159,000		234,034,000
Amortized cost [Abstract]
Total available for sale securities	248,369,000			248,369,000		231,262,000
Fair value [Abstract]
Total available for sale securities	252,159,000			252,159,000		234,034,000
Available for sale securities, continuous unrealized loss position [Abstract]
Less than 12 months, Fair value	53,561,000			53,561,000		35,511,000
12 months or longer, Fair value	3,426,000			3,426,000		10,149,000
Total, Fair value	56,987,000			56,987,000		45,660,000
Less than 12 months, Gross unrealized losses	(340,000)			(340,000)		(374,000)
12 months or longer, Gross unrealized losses	(28,000)			(28,000)		(169,000)
Total, Gross unrealized losses	(368,000)			(368,000)		(543,000)
Number of securities	16			16
Gross unrealized losses as percentage of aggregate cost (in hundredths)	0.60%			0.60%
Number of securities in an unrealized loss position for less than twelve months	15			15
Number of securities in an unrealized loss position for more than twelve months	1			1
Collateralized mortgage obligations, Non-agency [Member]
Carrying value and fair value of investment securities available for sale [Abstract]
Total available for sale, Amortized cost	1,067,000			1,067,000		4,739,000
Total available for sale, Gross unrealized gains	0			0		94,000
Total available for sale, Non-OTTI in AOCI	(69,000)			(69,000)		(1,000)
Total available for sale, Non-credit related OTTI in AOCI	0			0		0
Total available for sale securities	998,000			998,000		4,832,000
Amortized cost [Abstract]
Total available for sale securities	1,067,000			1,067,000		4,739,000
Fair value [Abstract]
Total available for sale securities	998,000			998,000		4,832,000
Available for sale securities, continuous unrealized loss position [Abstract]
Less than 12 months, Fair value	998,000			998,000		0
12 months or longer, Fair value	0			0		669,000
Total, Fair value	998,000			998,000		669,000
Less than 12 months, Gross unrealized losses	(69,000)			(69,000)		0
12 months or longer, Gross unrealized losses	0			0		(1,000)
Total, Gross unrealized losses	(69,000)			(69,000)		(1,000)
Number of securities	1			1
Gross unrealized losses as percentage of aggregate cost (in hundredths)	6.50%			6.50%
Number Of Securities In Unrealized Loss Position For Three Months	1			1
Corporate bonds [Member]
Carrying value and fair value of investment securities available for sale [Abstract]
Total available for sale, Amortized cost	7,299,000			7,299,000		13,342,000
Total available for sale, Gross unrealized gains	35,000			35,000		104,000
Total available for sale, Non-OTTI in AOCI	(320,000)			(320,000)		(471,000)
Total available for sale, Non-credit related OTTI in AOCI	0			0		0
Total available for sale securities	7,014,000			7,014,000		12,975,000
Amortized cost [Abstract]
Total available for sale securities	7,299,000			7,299,000		13,342,000
Fair value [Abstract]
Total available for sale securities	7,014,000			7,014,000		12,975,000
Available for sale securities, continuous unrealized loss position [Abstract]
Less than 12 months, Fair value	2,935,000			2,935,000		3,804,000
12 months or longer, Fair value	2,742,000			2,742,000		3,751,000
Total, Fair value	5,677,000			5,677,000		7,555,000
Less than 12 months, Gross unrealized losses	(64,000)			(64,000)		(197,000)
12 months or longer, Gross unrealized losses	(256,000)			(256,000)		(274,000)
Total, Gross unrealized losses	(320,000)			(320,000)		(471,000)
Number of securities	6			6
Gross unrealized losses as percentage of aggregate cost (in hundredths)	5.30%			5.30%
Number of securities in an unrealized loss position for less than twelve months	3			3
Number of securities in an unrealized loss position for more than twelve months	3			3
Number Of Securities Above Or At Investment Grade	6			6
Municipal bonds [Member]
Carrying value and fair value of investment securities available for sale [Abstract]
Total available for sale, Amortized cost	3,627,000			3,627,000		985,000
Total available for sale, Gross unrealized gains	0			0		0
Total available for sale, Non-OTTI in AOCI	(34,000)			(34,000)		(20,000)
Total available for sale, Non-credit related OTTI in AOCI	0			0
Total available for sale securities	3,593,000			3,593,000		965,000
Amortized cost [Abstract]
Total available for sale securities	3,627,000			3,627,000		985,000
Fair value [Abstract]
Total available for sale securities	3,593,000			3,593,000		965,000
Available for sale securities, continuous unrealized loss position [Abstract]
Less than 12 months, Fair value	2,887,000			2,887,000		965,000
12 months or longer, Fair value	0			0		0
Total, Fair value	2,887,000			2,887,000		965,000
Less than 12 months, Gross unrealized losses	(34,000)			(34,000)		(20,000)
12 months or longer, Gross unrealized losses	0			0		0
Total, Gross unrealized losses	(34,000)			(34,000)		(20,000)
Number of securities	3			3
Gross unrealized losses as percentage of aggregate cost (in hundredths)	0.90%			0.90%
Number of securities in an unrealized loss position for less than twelve months	3			3
Number Of Securities Above Or At Investment Grade	3			3
Trust preferred securities [Member]
Carrying value and fair value of investment securities available for sale [Abstract]
Total available for sale, Amortized cost	13,652,000			13,652,000		13,665,000
Total available for sale, Gross unrealized gains	1,660,000			1,660,000		2,280,000
Total available for sale, Non-OTTI in AOCI	0			0		0
Total available for sale, Non-credit related OTTI in AOCI	0			0		0
Total available for sale securities	15,312,000			15,312,000		15,945,000
Amortized cost [Abstract]
Total available for sale securities	13,652,000			13,652,000		13,665,000
Fair value [Abstract]
Total available for sale securities	15,312,000			15,312,000		15,945,000
Available for sale securities, continuous unrealized loss position [Abstract]
Number of securities based upon the fair market values of active trades	1			1
Number of securities using cash flow analysis	4			4
Credit related impairment losses on debt securities held, for portion of OTTI was recognized in other comprehensive income [Roll Forward]
Total OTTI charges	0		334,000	0	334,000
Other securities [Member]
Carrying value and fair value of investment securities available for sale [Abstract]
Total available for sale, Amortized cost	5,737,000			5,737,000		6,586,000
Total available for sale, Gross unrealized gains	537,000			537,000		347,000
Total available for sale, Non-OTTI in AOCI	(356,000)			(356,000)		(15,000)
Total available for sale, Non-credit related OTTI in AOCI	0			0		0
Total available for sale securities	5,918,000			5,918,000		6,918,000
Amortized cost [Abstract]
Total available for sale securities	5,737,000			5,737,000		6,586,000
Fair value [Abstract]
Total available for sale securities	5,918,000			5,918,000		6,918,000
Available for sale securities, continuous unrealized loss position [Abstract]
Less than 12 months, Fair value	1,546,000			1,546,000		502,000
12 months or longer, Fair value	334,000			334,000		0
Total, Fair value	1,880,000			1,880,000		502,000
Less than 12 months, Gross unrealized losses	(286,000)			(286,000)		(15,000)
12 months or longer, Gross unrealized losses	(70,000)			(70,000)		0
Total, Gross unrealized losses	(356,000)			(356,000)		(15,000)
Number of securities	3			3
Gross unrealized losses as percentage of aggregate cost (in hundredths)	15.90%			15.90%
Number of securities in an unrealized loss position for less than twelve months	2			2
Number of securities in an unrealized loss position for more than twelve months	1			1
Credit related impairment losses on debt securities held, for portion of OTTI was recognized in other comprehensive income [Roll Forward]
Total OTTI charges	$ 859,000		$ 0	$ 859,000	$ 0