Securities (Details) (USD $)	3 Months Ended		9 Months Ended												9 Months Ended							9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	3 Months Ended		9 Months Ended		3 Months Ended	9 Months Ended		3 Months Ended	9 Months Ended							9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012		Sep. 30, 2011		Dec. 31, 2011	Sep. 30, 2012 Below Investment Grade 1 [Member]	Sep. 30, 2012 Below Investment Grade 2 [Member]	Sep. 30, 2012 Below Investment Grade 3 [Member]	Sep. 30, 2012 U.S. Agency [Member]	Dec. 31, 2011 U.S. Agency [Member]	Sep. 30, 2012 U.S. Agency Residential Mortgage-Backed [Member]	Dec. 31, 2011 U.S. Agency Residential Mortgage-Backed [Member]	Sep. 30, 2012 Private Label Residential Mortgage-Backed [Member]	Dec. 31, 2011 Private Label Residential Mortgage-Backed [Member]	Sep. 30, 2012 Private Label Residential Mortgage-Backed [Member] California [Member]	Sep. 30, 2012 Private Label Residential Mortgage-Backed [Member] Florida [Member]	Sep. 30, 2012 Private Label Residential Mortgage-Backed [Member] Nevada [Member]	Sep. 30, 2012 Private Label Residential Mortgage-Backed [Member] Minimum [Member]	Sep. 30, 2012 Private Label Residential Mortgage-Backed [Member] Maximum [Member]	Sep. 30, 2012 Jumbo [Member]	Dec. 31, 2011 Jumbo [Member]	Sep. 30, 2012 Alt - A [Member]	Dec. 31, 2011 Alt - A [Member]	Sep. 30, 2012 Seasoned ARM Transactions [Member]	Sep. 30, 2012 Fixed Rate Jumbo [Member]	Sep. 30, 2011 Fixed Rate Jumbo [Member]	Sep. 30, 2012 Fixed Rate Jumbo [Member]	Sep. 30, 2011 Fixed Rate Jumbo [Member]	Sep. 30, 2012 Hybrid ARM Alt - A [Member]	Sep. 30, 2012 Hybrid ARM Alt - A [Member]	Sep. 30, 2011 Hybrid ARM Alt - A [Member]	Sep. 30, 2011 Hybrid ARM Jumbos [Member]	Sep. 30, 2012 Hybrid ARM Jumbos [Member]	Sep. 30, 2011 Hybrid ARM Jumbos [Member]	Sep. 30, 2012 Obligations of States and Political Subdivisions [Member]	Dec. 31, 2011 Obligations of States and Political Subdivisions [Member]	Sep. 30, 2012 Trust Preferred [Member]	Jun. 30, 2012 Trust Preferred [Member]	Dec. 31, 2011 Trust Preferred [Member]	Sep. 30, 2012 Rated Issues [Member]	Dec. 31, 2011 Rated Issues [Member]	Sep. 30, 2012 Unrated Issues - No OTTI [Member]	Dec. 31, 2011 Unrated Issues - No OTTI [Member]
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized cost	$ 230,980,000		$ 230,980,000				$ 161,023,000				$ 45,615,000	$ 24,980,000	$ 131,427,000	$ 93,415,000	$ 9,503,000	$ 11,066,000																					$ 39,733,000	$ 26,865,000	$ 4,702,000		$ 4,697,000
Unrealized gains	1,980,000		1,980,000				1,575,000				77,000	58,000	1,204,000	1,007,000	0	0																					699,000	510,000	0		0
Unrealized losses	2,774,000		2,774,000				5,154,000				55,000	21,000	11,000	216,000	1,201,000	2,798,000																					71,000	58,000	1,436,000		2,061,000
Fair Value	230,186,000		230,186,000				157,444,000				45,637,000	25,017,000	132,620,000	94,206,000	8,302,000	8,268,000																					40,361,000	27,317,000	3,266,000		2,636,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less Than Twelve Months, Fair Value	23,105,000		23,105,000				53,228,000				13,065,000	9,974,000	2,653,000	42,500,000		163,000																					7,387,000	0			591,000
Less Than Twelve Months, Unrealized Losses	127,000		127,000				1,545,000				55,000	21,000	1,000	216,000		90,000																					71,000	0			1,218,000
Twelve Months or More, Fair Value	21,830,000		21,830,000				11,876,000				0	0	10,264,000	0	8,300,000	8,102,000																						1,729,000	3,266,000		2,045,000
Twelve Months or More, Unrealized Losses	2,647,000		2,647,000				3,609,000				0	0	10,000	0	1,201,000	2,708,000																						58,000	1,436,000		843,000
Total, Fair value	44,935,000		44,935,000				65,104,000				13,065,000	9,974,000	12,917,000	42,500,000	8,300,000	8,265,000																					7,387,000	1,729,000	3,266,000		2,636,000
Total, Unrealized Losses	2,774,000		2,774,000				5,154,000				55,000	21,000	11,000	216,000	1,201,000	2,798,000																					71,000	58,000	1,436,000		2,061,000
Number of securities with market fair value less than amortized cost											3		3		8
Number of issues rated as investment grade															2
Number of securities rated below investment grade															4
Number of securities that are split rated															2
Number of securities not rated																																								2
Number of bonds with impairment in excess of ten percent															4
Percentage of excess impairment on bonds (in hundredths)															10.00%
Mortgage Backed Securities Issued By Private Enterprises [Abstract]
Fair Value																						6,128,000	6,454,000	2,174,000	1,814,000
Net Unrealized Gain Loss																						(879,000)	(1,937,000)	(322,000)	(861,000)
Percentage of credit widing (in hundredths)																						(74.00%)		(26.00%)
Number of transactions with geographic concentration																	7	3	1
Collateral pool, minimum (in hundredths)																	22.00%	5.00%
Collateral pool, maximum (in hundredths)																	58.00%	7.00%
Typical median exposure (in hundredths)																	47.00%		5.00%
Number of transactions with concentration in loans															6
Percentage of loans with interest only for for a specified period of time (in hundredths)																				31.00%	94.00%
Super senior (in hundredths)															22.00%
Senior (in hundredths)															43.00%
Senior support (in hundredths)															25.00%
Mezzanine (in hundredths)															10.00%
Seasoned transaction period			97 months
Level of subordination (in hundredths)															8.69%
Review of credit performance			includes: current period as well as cumulative realized losses; the level of severe payment problems, which includes other real estate (ORE), foreclosures, bankruptcy and 90 day delinquencies; and the level of less severe payment problems, which consists of 30 and 60 day delinquencies
Normalized prepayment rate, minimum (in hundredths)																										12.00%
Normalized prepayment rate, maximum (in hundredths)																										18.00%
Number of transactions with fixed rate collateral															1
Projected period of decline in loan defaults			3 years
Expected loss severity period			3 years
Period loss severity are expected to decline			4 years
The number of private label mortgage backed securities currently below investment grade with OTTI															3
Fair value of private label mortgage backed securities currently below investment grade with OTTI								3,600,000	1,900,000	100,000
Private label mortgage backed securities with OTTI and below investment grade, unrealized losses								400,000	100,000	30,000
Private label mortgage backed securities with OTTI and below investment grade, amortized cost								4,000	2,000	100
Loan transactions period																													30 years			30 years			30 years
Average fico required for underlying loans																											744		744		717	717			738
Average loan-to-value (in hundredths)																													72.00%			78.00%			57.00%
Loan origination date																													2007			2005			2005
Credit related to OTTI																											715,000		715,000		457,000	457,000			380,000
OTTI changes recorded in earnings	70,000	4,000	332,000		146,000																						70,000	4,000	240,000	56,000	0	32,000	0	0	60,000	90,000
Number of municipal securities with fair value less than amortized cost	7		7
Number of impaired municipal securities rated by major agency	6		6
Non-rated securities, amortized cost																																							2,800,000
Fair value of non-rated trust preferred securities																																							1,800,000
Trust preferred securities [Abstract]
Number of securities with fair values less than amortized cost	4		4
Fair Value																																										1,474,000	1,405,000	1,792,000	1,231,000
Net Unrealized Gain (Loss)																																										(421,000)	(484,000)	(1,015,000)	(1,577,000)
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]
Maturing within one year	1,620,000		1,620,000
Maturing after one year but within five years	6,604,000		6,604,000
Maturing after five years but within ten years	25,922,000		25,922,000
Maturing after ten years	55,904,000		55,904,000
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis	90,050,000		90,050,000
U.S. agency residential mortgage-backed	131,427,000		131,427,000
Private label residential mortgage-backed	9,503,000		9,503,000
Total	230,980,000		230,980,000
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Maturing within one year	1,633,000		1,633,000
Maturing after one year but within five years	6,818,000		6,818,000
Maturing after five years but within ten years	26,106,000		26,106,000
Maturing after ten years	54,707,000		54,707,000
Available-for-sale Securities fair value total	89,264,000		89,264,000
U.S. agency residential mortgage backed	132,620,000		132,620,000
Private label residential mortgage-backed	8,302,000		8,302,000
Total	230,186,000		230,186,000
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Balance at beginning of period	1,732,000	852,000	1,470,000		710,000
Additions to credit losses on securities for which no previous OTTI was recognized	0	0	0		0
Increases to credit losses on securities for which OTTI was previously recognized	70,000	4,000	332,000		146,000
Balance at end of period	1,802,000	856,000	1,802,000		856,000
Gain and losses realized on sale of securities available for sale [Abstract]
Proceeds			37,176,000		70,322,000
Realized Gains			1,193,000		279,000
Realized Losses			0	[1]	75,000	[1]
OTTI not reported in earning			332,000		146,000
Trading Securities, Realized Gain (Loss)			$ (39,000)		$ 67,000

[1] Losses in 2012 and 2011 exclude $0.332 million and $0.146 million, respectively of credit related OTTI recognized in earnings.