Securities (Details) (USD $)	3 Months Ended		6 Months Ended				12 Months Ended	6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended	6 Months Ended		12 Months Ended		6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended	6 Months Ended	3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended			12 Months Ended	6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014		Jun. 30, 2013		Dec. 31, 2013	Jun. 30, 2014 U.S. Agency [Member] Security	Dec. 31, 2013 U.S. Agency [Member]	Jun. 30, 2014 U.S. Agency Residential Mortgage-Backed [Member] Security	Dec. 31, 2013 U.S. Agency Residential Mortgage-Backed [Member]	Jun. 30, 2014 U.S. Agency Commercial Mortgage-Backed [Member] Security	Jun. 30, 2014 Private Label Residential Mortgage-Backed [Member] Security Transaction Bond	Dec. 31, 2013 Private Label Residential Mortgage-Backed [Member]	Mar. 31, 2013 Private Label Residential Mortgage-Backed [Member] Security	Jun. 30, 2014 Jumbo [Member]	Dec. 31, 2013 Jumbo [Member]	Jun. 30, 2014 Alt - A [Member]	Dec. 31, 2013 Alt - A [Member]	Jun. 30, 2014 Seasoned ARM Transactions [Member]	Jun. 30, 2014 Senior Security [Member]	Jun. 30, 2013 Senior Security [Member]	Jun. 30, 2014 Senior Security [Member]	Jun. 30, 2013 Senior Security [Member]	Jun. 30, 2014 Super Senior Security [Member]	Jun. 30, 2013 Super Senior Security [Member]	Jun. 30, 2014 Super Senior Security [Member]	Jun. 30, 2013 Super Senior Security [Member]	Jun. 30, 2014 Senior Support Security [Member]	Jun. 30, 2013 Senior Support Security [Member]	Jun. 30, 2014 Senior Support Security [Member]	Jun. 30, 2013 Senior Support Security [Member]	Jun. 30, 2014 Other Asset-backed [Member] Security	Dec. 31, 2013 Other Asset-backed [Member]	Jun. 30, 2014 Obligations of States and Political Subdivisions [Member] Security	Dec. 31, 2013 Obligations of States and Political Subdivisions [Member]	Jun. 30, 2014 Trust Preferred [Member] CreditRatingAgency Security	Dec. 31, 2013 Trust Preferred [Member]	Jun. 30, 2014 Rated Issues [Member]	Dec. 31, 2013 Rated Issues [Member]	Jun. 30, 2014 Unrated Issues [Member]	Dec. 31, 2013 Unrated Issues [Member]	Jun. 30, 2014 Corporate [Member] Security	Dec. 31, 2013 Corporate [Member]
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized cost	$ 518,706,000		$ 518,706,000				$ 467,406,000	$ 31,495,000	$ 32,106,000	$ 248,930,000	$ 202,649,000	$ 17,731,000	$ 6,802,000	$ 7,294,000																			$ 37,530,000	$ 45,369,000	$ 153,488,000	$ 157,966,000	$ 2,906,000	$ 2,902,000					$ 19,824,000	$ 19,120,000
Unrealized gains	2,935,000		2,935,000				2,048,000	170,000	44,000	1,402,000	1,343,000	71,000	173,000	112,000																			58,000	10,000	945,000	496,000	0	0					116,000	43,000
Unrealized losses	3,515,000		3,515,000				6,973,000	85,000	342,000	465,000	532,000	44,000	345,000	618,000																			58,000	194,000	2,088,000	4,784,000	411,000	477,000					19,000	26,000
Fair Value	518,126,000		518,126,000				462,481,000	31,580,000	31,808,000	249,867,000	203,460,000	17,758,000	6,630,000	6,788,000																			37,530,000	45,185,000	152,345,000	153,678,000	2,495,000	2,425,000					19,921,000	19,137,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less Than Twelve Months, Fair Value	181,253,000		181,253,000				240,287,000	6,079,000	16,715,000	91,491,000	78,256,000	10,624,000	0	407,000																			18,345,000	33,862,000	51,974,000	103,942,000	0	0					2,740,000	7,105,000
Less Than Twelve Months, Unrealized Losses			1,519,000				5,745,000	10,000	342,000	318,000	532,000	44,000	0	6,000																			58,000	194,000	1,070,000	4,645,000	0	0					19,000	26,000
Twelve Months or More, Fair Value	62,085,000		62,085,000				11,832,000	8,044,000	0	20,514,000	0	0	4,491,000	4,602,000																			0	0	26,541,000	4,805,000	2,495,000	2,425,000					0	0
Twelve Months or More, Unrealized Losses			1,996,000				1,228,000	75,000	0	147,000	0	0	345,000	612,000																			0	0	1,018,000	139,000	411,000	477,000					0	0
Total, Fair value	243,338,000		243,338,000				252,119,000	14,123,000	16,715,000	112,005,000	78,256,000	10,624,000	4,491,000	5,009,000																			18,345,000	33,862,000	78,515,000	108,747,000	2,495,000	2,425,000					2,740,000	7,105,000
Total, Unrealized Losses			3,515,000				6,973,000	85,000	342,000	465,000	532,000	44,000	345,000	618,000																			58,000	194,000	2,088,000	4,784,000	411,000	477,000					19,000	26,000
Private Label Residential Mortgage Backed Securities Below Investment Grade [Abstract]
Fair value	4,223,000		4,223,000																		2,459,000		2,459,000		1,722,000		1,722,000		42,000		42,000
Amortized cost	4,140,000		4,140,000																		2,548,000		2,548,000		1,592,000		1,592,000		0		0
Non-credit unrealized loss	89,000		89,000																		89,000		89,000		0		0		0		0
Unrealized gain	172,000		172,000																		0		0		130,000		130,000		42,000		42,000
Cumulative credit related OTTI	1,585,000		1,585,000																		748,000		748,000		457,000		457,000		380,000		380,000
OTTI changes recorded in earnings	0	26,000	0		26,000																0	26,000	0	26,000	0	0	0	0	0	0	0	0
Number of securities with market fair value less than amortized cost								8		56		11	4																				15		97		3						3
Number of securities													5
Number of securities rated as investment grade													2																								1
Number of securities rated as below investment grade													2																								1
Number of major credit rating agencies rating securities with fair value less than amortized cost																																					2
Number of securities not rated																																					1
Number of bonds with impairment in excess of ten percent													2
Percentage of excess impairment on bonds (in hundredths)													10.00%
Number of bonds with impairment for more than 12 months													4
Mortgage Backed Securities Issued By Private Enterprises [Abstract]
Fair Value																4,520,000	4,687,000	2,110,000	2,101,000
Net Unrealized Loss																(211,000)	(441,000)	39,000	(65,000)
Percentage of credit spread widening (in hundredths)																68.00%		32.00%
Normalized prepayment rate, minimum (in hundredths)																				10.00%
Normalized prepayment rate, maximum (in hundredths)																				25.00%
Number of transactions with fixed rate collateral													1
Projected period of decline in loan defaults			3 years
Expected loss severity period			12 months
The number of private label mortgage backed securities currently below investment grade with OTTI													3
Number of private label mortgage backed securities currently below investment grade with OTTI unrealized gains													2
Number of private label mortgage backed securities currently below investment grade with OTTI unrealized loss													1		3
Number of private label mortgage backed securities currently below investment grade with OTTI unrealized loss less than previous OTTI credit													2
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																																					800,000
Trust preferred securities [Abstract]
Fair Value																																							1,693,000	1,600,000	802,000	825,000
Net Unrealized Loss																																							(213,000)	(302,000)	(198,000)	(175,000)
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]
Maturing within one year	18,937,000		18,937,000
Maturing after one year but within five years	72,390,000		72,390,000
Maturing after five years but within ten years	43,186,000		43,186,000
Maturing after ten years	73,200,000		73,200,000
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis	207,713,000		207,713,000
U.S. agency residential mortgage-backed	248,930,000		248,930,000
U.S. agency commercial mortgage-backed	17,731,000		17,731,000
Private label residential mortgage-backed	6,802,000		6,802,000
Other asset backed	37,530,000		37,530,000
Total	518,706,000		518,706,000
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Maturing within one year	18,994,000		18,994,000
Maturing after one year but within five years	72,741,000		72,741,000
Maturing after five years but within ten years	43,415,000		43,415,000
Maturing after ten years	71,191,000		71,191,000
Available-for-sale Securities fair value total	206,341,000		206,341,000
U.S. agency residential mortgage backed	249,867,000		249,867,000
U.S. agency commercial mortgage-backed	17,758,000		17,758,000
Private label residential mortgage-backed	6,630,000		6,630,000
Other asset backed	37,530,000		37,530,000
Total	518,126,000		518,126,000
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Balance at beginning of year	1,835,000	1,809,000	1,835,000		1,809,000		1,809,000
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	0	26,000	0		26,000
Balance at end period	1,835,000	1,835,000	1,835,000		1,835,000		1,835,000
Gain and losses realized on sale of securities available for sale [Abstract]
Proceeds			5,126,000		2,940,000
Realized Gains			2,000	[1]	15,000	[1]
Losses			0	[2]	7,000	[2]
Unrealized gain related to U.S. Treasury short position			53,000
Trading Securities, Realized Gains			$ 111,000		$ 183,000

[1] Gains in 2014 exclude $0.053 million of unrealized gain related to a U.S. Treasury short position.

[2] Losses in 2013 exclude $0.026 of credit related to OTTI recognized in earnings.