Securities (Details) (USD $)	3 Months Ended												3 Months Ended							3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended											3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended
	Mar. 31, 2013 Security		Mar. 31, 2012		Dec. 31, 2012	Mar. 31, 2013 Below Investment Grade 1 [Member]	Mar. 31, 2013 Below Investment Grade 2 [Member]	Mar. 31, 2013 Below Investment Grade 3 [Member]	Mar. 31, 2013 U.S. Agency [Member] Security	Dec. 31, 2012 U.S. Agency [Member]	Mar. 31, 2013 U.S. Agency Residential Mortgage-Backed [Member] Security	Dec. 31, 2012 U.S. Agency Residential Mortgage-Backed [Member]	Mar. 31, 2013 Private Label Residential Mortgage-Backed [Member] Security	Dec. 31, 2012 Private Label Residential Mortgage-Backed [Member]	Mar. 31, 2013 Private Label Residential Mortgage-Backed [Member] California [Member] Transaction	Mar. 31, 2013 Private Label Residential Mortgage-Backed [Member] Florida [Member] Transaction	Mar. 31, 2013 Private Label Residential Mortgage-Backed [Member] Nevada [Member] Transaction	Mar. 31, 2013 Private Label Residential Mortgage-Backed [Member] Minimum [Member]	Mar. 31, 2013 Private Label Residential Mortgage-Backed [Member] Maximum [Member]	Mar. 31, 2013 Jumbo [Member]	Dec. 31, 2012 Jumbo [Member]	Mar. 31, 2013 Alt - A [Member]	Dec. 31, 2012 Alt - A [Member]	Mar. 31, 2013 Seasoned ARM Transactions [Member]	Mar. 31, 2013 Fixed Rate Jumbo [Member]	Mar. 31, 2012 Fixed Rate Jumbo [Member]	Mar. 31, 2013 Hybrid ARM Alt - A [Member]	Mar. 31, 2012 Hybrid ARM Alt - A [Member]	Mar. 31, 2013 Hybrid ARM Jumbos [Member]	Mar. 31, 2012 Hybrid ARM Jumbos [Member]	Mar. 31, 2013 Obligations of States and Political Subdivisions [Member]	Dec. 31, 2012 Obligations of States and Political Subdivisions [Member]	Mar. 31, 2013 Trust Preferred [Member] Security	Dec. 31, 2012 Trust Preferred [Member]	Mar. 31, 2013 Rated Issues [Member]	Dec. 31, 2012 Rated Issues [Member]	Mar. 31, 2013 Unrated Issues - No OTTI [Member]	Dec. 31, 2012 Unrated Issues - No OTTI [Member]	Mar. 31, 2013 Corporate [Member]
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized cost	$ 283,436,000				$ 208,929,000				$ 8,120,000	$ 30,620,000	$ 192,538,000	$ 126,151,000	$ 8,573,000	$ 9,070,000																	$ 70,318,000	$ 38,384,000	$ 2,898,000	$ 4,704,000					$ 989,000
Unrealized gains	2,365,000				2,070,000				0	70,000	1,536,000	1,264,000	1,000	0																	828,000	736,000	0	0					0
Unrealized losses	1,867,000				2,586,000				14,000	23,000	67,000	3,000	1,009,000	876,000																	243,000	69,000	533,000	1,615,000					1,000
Fair Value	283,934,000				208,413,000				8,106,000	30,667,000	194,007,000	127,412,000	7,565,000	8,194,000																	70,903,000	39,051,000	2,365,000	3,089,000					988,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less Than Twelve Months, Fair Value	92,830,000				15,481,000				8,106,000	8,097,000	60,230,000	0	0	0																	23,506,000	7,384,000	0	0					988,000
Less Than Twelve Months, Unrealized Losses	294,000				92,000				14,000	23,000	66,000	0	0	0																	213,000	69,000	0	0					1,000
Twelve Months or More, Fair Value	11,152,000				11,738,000				0	0	236,000	457,000	7,323,000	8,192,000																	1,228,000	0	2,365,000	3,089,000					0
Twelve Months or More, Unrealized Losses	1,573,000				2,494,000				0	0	1,000	3,000	1,009,000	876,000																	30,000	0	533,000	1,615,000					0
Total, Fair value	103,982,000				27,219,000				8,106,000	8,097,000	60,466,000	457,000	7,323,000	8,192,000																	24,734,000	7,384,000	2,365,000	3,089,000					988,000
Total, Unrealized Losses	1,867,000				2,586,000				14,000	23,000	67,000	3,000	1,009,000	876,000																	243,000	69,000	533,000	1,615,000					1,000
Number of securities with market fair value less than amortized cost									2		7		7
Number of issues rated as investment grade													2
Number of securities rated below investment grade													4
Number of securities that are split rated													1
Number of bonds with impairment in excess of ten percent													3
Percentage of excess impairment on bonds (in hundredths)													10.00%
Mortgage Backed Securities Issued By Private Enterprises [Abstract]
Fair Value																				5,274,000	6,041,000	2,049,000	2,153,000
Net Unrealized Gain Loss																				(683,000)	(594,000)	(326,000)	(282,000)
Percentage of credit spread widening (in hundredths)																				72.00%		28.00%
Number of transactions with geographic concentration															6	3	1
Collateral pool, minimum (in hundredths)															28.00%	5.00%
Collateral pool, maximum (in hundredths)															58.00%	7.00%
Typical median exposure (in hundredths)															50.00%		5.00%
Number of transactions with concentration in loans													6
Percentage of loans with interest only for a specified period of time (in hundredths)																		31.00%	94.00%
Super senior (in hundredths)													24.00%
Senior (in hundredths)													42.00%
Senior support (in hundredths)													23.00%
Mezzanine (in hundredths)													11.00%
Seasoned transaction period	105 months
Level of subordination (in hundredths)													8.25%
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)																								24.00%
Number of transactions with fixed rate collateral													1
Projected period of decline in loan defaults	3 years
Expected loss severity period	18 months
Period loss severity are expected to decline	2 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						3,100,000	1,700,000	100,000
Private label mortgage backed securities with OTTI and below investment grade, unrealized losses						400,000	100,000	10,000
Private label mortgage backed securities with OTTI and below investment grade, amortized cost						3,500,000	1,800,000	100,000
Loan transactions period																									30 years		30 years		30 years
Average fico required for underlying loans																									744		717		738
Average loan-to-value (in hundredths)																									72.00%		78.00%		57.00%
Loan origination date																									2007		2005		2005
Credit related to OTTI																									722,000		457,000		380,000
OTTI changes recorded in earnings	0		177,000																						0	85,000	0	32,000	0	60,000
Number of municipal securities with fair value less than amortized cost	32
Number of impaired municipal securities rated by major agency																																	3
Non-rated securities, amortized cost																																	1,000,000
Fair value of non-rated trust preferred securities																																	700,000
Trust preferred securities [Abstract]
Number of securities with fair values less than amortized cost	3
Fair Value																																			1,618,000	1,581,000	747,000	1,508,000
Net Unrealized Gain (Loss)																																			(280,000)	(316,000)	(253,000)	(1,299,000)
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]
Maturing within one year	1,976,000
Maturing after one year but within five years	19,358,000
Maturing after five years but within ten years	20,595,000
Maturing after ten years	40,396,000
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis	82,325,000
U.S. agency residential mortgage-backed	192,538,000
Private label residential mortgage-backed	8,573,000
Total	283,436,000
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Maturing within one year	1,975,000
Maturing after one year but within five years	19,514,000
Maturing after five years but within ten years	20,890,000
Maturing after ten years	39,983,000
Available-for-sale Securities fair value total	82,362,000
U.S. agency residential mortgage backed	194,007,000
Private label residential mortgage-backed	7,565,000
Total	283,934,000
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Balance at beginning of year	1,809,000		1,470,000
Additions to credit losses on securities for which no previous OTTI was recognized	0		0
Increases to credit losses on securities for which OTTI was previously recognized	0		177,000
Balance at beginning of year	1,809,000		1,647,000
Gain and losses realized on sale of securities available for sale [Abstract]
Proceeds	1,800,000		9,206,000
Realized Gains	0		692,000
Realized Losses	7,000	[1]	0	[1]
OTTI not reported in earning	0		177,000
Trading Securities, Realized Gain (Loss)	$ 91,000		$ (8,000)

[1] Losses in 2013 and 2012 exclude zero and $0.177 million, respectively of credit related OTTI recognizedn earnings.