Securities (Details) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014	Mar. 31, 2013 Security
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized cost	$ 569,308,000		$ 532,930,000
Unrealized gains	4,544,000		3,317,000
Unrealized losses	2,090,000		3,069,000
Fair Value	571,762,000		533,178,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less Than Twelve Months, Fair Value	107,419,000		163,665,000
Less Than Twelve Months, Unrealized Losses	351,000		909,000
Twelve Months or More, Fair Value	57,078,000		69,122,000
Twelve Months or More, Unrealized Losses	1,739,000		2,160,000
Total, Fair value	164,497,000		232,787,000
Total, Unrealized Losses	2,090,000		3,069,000
Private Label Residential Mortgage Backed Securities Below Investment Grade [Abstract]
Fair value	3,673,000
Amortized cost	3,518,000
Non-credit unrealized loss	39,000
Unrealized gain	194,000
Cumulative credit related OTTI	1,594,000
OTTI changes recorded in earnings	0	0
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]
Maturing within one year	28,410,000
Maturing after one year but within five years	61,845,000
Maturing after five years but within ten years	36,871,000
Maturing after ten years	75,861,000
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis	202,987,000
U.S. agency residential mortgage-backed	232,286,000
U.S. agency commercial mortgage-backed	32,846,000
Private label residential mortgage-backed	5,992,000
Other asset backed	95,197,000
Total	569,308,000
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Maturing within one year	28,419,000
Maturing after one year but within five years	62,190,000
Maturing after five years but within ten years	37,377,000
Maturing after ten years	75,430,000
Available-for-sale Securities fair value total	203,416,000
U.S. agency residential mortgage backed	234,254,000
U.S. agency commercial mortgage-backed	33,081,000
Private label residential mortgage-backed	5,820,000
Other asset backed	95,191,000
Total	571,762,000
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Balance at beginning of year	1,844,000	1,835,000	1,835,000
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	0
Total	1,844,000	1,835,000
Gain and losses realized on sale of securities available for sale [Abstract]
Proceeds	11,786,000	0
Realized Gains	75,000	0
Realized Losses	0	0
Trading securities, realized gains	10,000	112,000
U.S. Agency [Member]
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized cost	35,308,000		34,936,000
Unrealized gains	255,000		133,000
Unrealized losses	34,000		63,000
Fair Value	35,529,000		35,006,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less Than Twelve Months, Fair Value	12,822,000		12,851,000
Less Than Twelve Months, Unrealized Losses	29,000		58,000
Twelve Months or More, Fair Value	775,000		606,000
Twelve Months or More, Unrealized Losses	5,000		5,000
Total, Fair value	13,597,000		13,457,000
Total, Unrealized Losses	34,000		63,000
Private Label Residential Mortgage Backed Securities Below Investment Grade [Abstract]
Number of securities with market fair value less than amortized cost	18
U.S. Agency Residential Mortgage-Backed [Member]
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized cost	232,286,000		256,387,000
Unrealized gains	2,162,000		1,838,000
Unrealized losses	194,000		667,000
Fair Value	234,254,000		257,558,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less Than Twelve Months, Fair Value	29,496,000		89,547,000
Less Than Twelve Months, Unrealized Losses	119,000		531,000
Twelve Months or More, Fair Value	11,171,000		15,793,000
Twelve Months or More, Unrealized Losses	75,000		136,000
Total, Fair value	40,667,000		105,340,000
Total, Unrealized Losses	194,000		667,000
Private Label Residential Mortgage Backed Securities Below Investment Grade [Abstract]
Number of securities with market fair value less than amortized cost	41
U.S. Agency Commercial Mortgage-Backed [Member]
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized cost	32,846,000		33,779,000
Unrealized gains	270,000		68,000
Unrealized losses	35,000		119,000
Fair Value	33,081,000		33,728,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less Than Twelve Months, Fair Value	7,999,000		21,325,000
Less Than Twelve Months, Unrealized Losses	28,000		119,000
Twelve Months or More, Fair Value	2,600,000		0
Twelve Months or More, Unrealized Losses	7,000		0
Total, Fair value	10,599,000		21,325,000
Total, Unrealized Losses	35,000		119,000
Private Label Residential Mortgage Backed Securities Below Investment Grade [Abstract]
Number of securities with market fair value less than amortized cost	10
Private Label Residential Mortgage-Backed [Member]
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized cost	5,992,000		6,216,000
Unrealized gains	195,000		187,000
Unrealized losses	367,000		390,000
Fair Value	5,820,000		6,013,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less Than Twelve Months, Fair Value	202,000		208,000
Less Than Twelve Months, Unrealized Losses	1,000		1,000
Twelve Months or More, Fair Value	3,883,000		4,013,000
Twelve Months or More, Unrealized Losses	366,000		389,000
Total, Fair value	4,085,000		4,221,000
Total, Unrealized Losses	367,000		390,000
Private Label Residential Mortgage Backed Securities Below Investment Grade [Abstract]
Number of securities with market fair value less than amortized cost	5
Number of securities	5
Number of securities rated as investment grade	2
Number of securities rated as below investment grade	2
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
The number of private label mortgage backed securities currently below investment grade with OTTI	4
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
Senior Security [Member]
Private Label Residential Mortgage Backed Securities Below Investment Grade [Abstract]
Fair value	2,053,000
Amortized cost	2,092,000
Non-credit unrealized loss	39,000
Unrealized gain	0
Cumulative credit related OTTI	757,000
OTTI changes recorded in earnings	0	0
Super Senior Security [Member]
Private Label Residential Mortgage Backed Securities Below Investment Grade [Abstract]
Fair value	1,524,000
Amortized cost	1,426,000
Non-credit unrealized loss	0
Unrealized gain	98,000
Cumulative credit related OTTI	457,000
OTTI changes recorded in earnings	0	0
Senior Support Security [Member]
Private Label Residential Mortgage Backed Securities Below Investment Grade [Abstract]
Fair value	96,000
Amortized cost	0
Non-credit unrealized loss	0
Unrealized gain	96,000
Cumulative credit related OTTI	380,000
OTTI changes recorded in earnings	0	0
Other Asset-backed [Member]
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized cost	95,197,000		32,314,000
Unrealized gains	110,000		77,000
Unrealized losses	116,000		38,000
Fair Value	95,191,000		32,353,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less Than Twelve Months, Fair Value	28,970,000		2,960,000
Less Than Twelve Months, Unrealized Losses	46,000		15,000
Twelve Months or More, Fair Value	7,232,000		8,729,000
Twelve Months or More, Unrealized Losses	70,000		23,000
Total, Fair value	36,202,000		11,689,000
Total, Unrealized Losses	116,000		38,000
Private Label Residential Mortgage Backed Securities Below Investment Grade [Abstract]
Number of securities with market fair value less than amortized cost	29
Obligations of States and Political Subdivisions [Member]
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized cost	142,133,000		143,698,000
Unrealized gains	1,469,000		961,000
Unrealized losses	814,000		1,244,000
Fair Value	142,788,000		143,415,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less Than Twelve Months, Fair Value	24,722,000		28,114,000
Less Than Twelve Months, Unrealized Losses	70,000		106,000
Twelve Months or More, Fair Value	28,979,000		37,540,000
Twelve Months or More, Unrealized Losses	744,000		1,138,000
Total, Fair value	53,701,000		65,654,000
Total, Unrealized Losses	814,000		1,244,000
Private Label Residential Mortgage Backed Securities Below Investment Grade [Abstract]
Number of securities with market fair value less than amortized cost	57
Trust Preferred [Member]
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized cost	2,910,000		2,910,000
Unrealized gains	0		0
Unrealized losses	472,000		469,000
Fair Value	2,438,000		2,441,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less Than Twelve Months, Fair Value	0		0
Less Than Twelve Months, Unrealized Losses	0		0
Twelve Months or More, Fair Value	2,438,000		2,441,000
Twelve Months or More, Unrealized Losses	472,000		469,000
Total, Fair value	2,438,000		2,441,000
Total, Unrealized Losses	472,000		469,000
Private Label Residential Mortgage Backed Securities Below Investment Grade [Abstract]
Number of securities with market fair value less than amortized cost	3
Number of securities rated as investment grade	1
Number of securities rated as below investment grade	1
Number of major credit rating agencies rating securities with fair value less than amortized cost	2
Number of securities not rated	1
Non-rated securities, amortized cost	1,000,000
Fair value of non-rated trust preferred securities	800,000
Rated Issues [Member]
Trust preferred securities [Abstract]
Fair Value	1,674,000		1,643,000
Net Unrealized Loss	(236,000)		(267,000)
Unrated Issues [Member]
Trust preferred securities [Abstract]
Fair Value	764,000		798,000
Net Unrealized Loss	(236,000)		(202,000)
Corporate [Member]
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized cost	22,636,000		22,690,000
Unrealized gains	83,000		53,000
Unrealized losses	58,000		79,000
Fair Value	22,661,000		22,664,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less Than Twelve Months, Fair Value	3,208,000		8,660,000
Less Than Twelve Months, Unrealized Losses	58,000		79,000
Twelve Months or More, Fair Value	0		0
Twelve Months or More, Unrealized Losses	0		0
Total, Fair value	3,208,000		8,660,000
Total, Unrealized Losses	$ 58,000		$ 79,000
Private Label Residential Mortgage Backed Securities Below Investment Grade [Abstract]
Number of securities with market fair value less than amortized cost	5