Securities (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2016 USD ($) Security	Mar. 31, 2015 USD ($)	Dec. 31, 2015 USD ($) Security
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized Cost	$ 587,963		$ 585,851
Unrealized Gains	4,262		3,152
Unrealized Losses	2,725		3,519
Fair Value	589,500		585,484
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less Than Twelve Months, Fair Value	176,042		272,152
Less Than Twelve Months, Unrealized Losses	953		1,744
Twelve Months or More, Fair Value	48,815		55,638
Twelve Months or More, Unrealized Losses	1,772		1,775
Total, Fair Value	224,857		327,790
Total, Unrealized Losses	2,725		3,519
Private Label Mortgage Backed Securities Below Investment Grade [Abstract]
Fair value	2,871
Amortized cost	2,763
Non-credit unrealized loss	29
Unrealized gain	137
Cumulative credit related OTTI	1,594
OTTI changes recorded in earnings	0	$ 0
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Balance at beginning of period	1,844	1,844	1,844
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
Balance at end of period	1,844	1,844	1,844
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]
Maturing within one year	30,411
Maturing after one year but within five years	74,249
Maturing after five years but within ten years	62,664
Maturing after ten years	69,240
Available-for-sale securities, debt maturities, amortized cost basis	236,564
U.S. agency residential mortgage-backed	196,017
U.S. agency commercial mortgage-backed	8,382
Private label residential mortgage-backed	18,569
Other asset backed	128,431
Total	587,963
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Maturing within one year	30,453
Maturing after one year but within five years	74,472
Maturing after five years but within ten years	63,236
Maturing after ten years	69,021
Total available-for-sale securities fair value	237,182
U.S. agency residential mortgage-backed	197,379
U.S. agency commercial mortgage-backed	8,492
Private label residential mortgage-backed	18,375
Other asset backed	128,072
Total	589,500
Gain and losses realized on sale of securities available for sale [Abstract]
Proceeds	42,391	11,786
Realized gains	226	75
Realized losses	52	0
Trading securities, realized gains (losses)	(12)	10
Credit related OTTI recognized in earnings	0	0
U.S. Agency [Member]
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized Cost	35,016		47,283
Unrealized Gains	431		309
Unrealized Losses	62		80
Fair Value	35,385		47,512
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less Than Twelve Months, Fair Value	7,168		12,164
Less Than Twelve Months, Unrealized Losses	20		47
Twelve Months or More, Fair Value	6,360		6,746
Twelve Months or More, Unrealized Losses	42		33
Total, Fair Value	13,528		18,910
Total, Unrealized Losses	$ 62		80
Number of securities with market fair value less than amortized cost | Security	30
U.S. Agency Residential Mortgage-Backed [Member]
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized Cost	$ 196,017		195,055
Unrealized Gains	1,635		1,584
Unrealized Losses	273		583
Fair Value	197,379		196,056
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less Than Twelve Months, Fair Value	26,856		57,538
Less Than Twelve Months, Unrealized Losses	130		316
Twelve Months or More, Fair Value	16,325		23,340
Twelve Months or More, Unrealized Losses	143		267
Total, Fair Value	43,181		80,878
Total, Unrealized Losses	$ 273		583
Number of securities with market fair value less than amortized cost | Security	66
U.S. Agency Commercial Mortgage-Backed [Member]
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized Cost	$ 8,382		34,017
Unrealized Gains	112		94
Unrealized Losses	2		83
Fair Value	8,492		34,028
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less Than Twelve Months, Fair Value	1,236		16,747
Less Than Twelve Months, Unrealized Losses	1		60
Twelve Months or More, Fair Value	202		2,247
Twelve Months or More, Unrealized Losses	1		23
Total, Fair Value	1,438		18,994
Total, Unrealized Losses	$ 2		83
Number of securities with market fair value less than amortized cost | Security	5
Private Label Mortgage-Backed [Member]
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized Cost	$ 18,569		5,061
Unrealized Gains	154		161
Unrealized Losses	348		319
Fair Value	18,375		4,903
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less Than Twelve Months, Fair Value	5,645		0
Less Than Twelve Months, Unrealized Losses	17		0
Twelve Months or More, Fair Value	3,093		3,393
Twelve Months or More, Unrealized Losses	331		319
Total, Fair Value	8,738		3,393
Total, Unrealized Losses	$ 348		$ 319
Number of securities with market fair value less than amortized cost | Security	11
Number of securities purchased prior to 2016 | Security			5
Number of securities with impairment in excess of ten percent | Security	2
Percentage of excess impairment on securities	10.00%
Number of securities with impairment for more than 12 months | Security	4
Private Label Mortgage Backed Securities Below Investment Grade [Abstract]
Number of private label mortgage backed securities complete recovery of cost basis | Security	4
Number of private label mortgage backed securities with OTTI unrealized gains | Security	2
Number of private label mortgage backed securities with OTTI unrealized loss | Security	1
Number of private label mortgage backed securities currently below investment grade with OTTI unrealized loss less than previous OTTI credit | Security	2
Senior Security [Member]
Private Label Mortgage Backed Securities Below Investment Grade [Abstract]
Fair value	$ 1,546
Amortized cost	1,575
Non-credit unrealized loss	29
Unrealized gain	0
Cumulative credit related OTTI	757
OTTI changes recorded in earnings	0	0
Super Senior Security [Member]
Private Label Mortgage Backed Securities Below Investment Grade [Abstract]
Fair value	1,250
Amortized cost	1,188
Non-credit unrealized loss	0
Unrealized gain	62
Cumulative credit related OTTI	457
OTTI changes recorded in earnings	0	0
Senior Support Security [Member]
Private Label Mortgage Backed Securities Below Investment Grade [Abstract]
Fair value	75
Amortized cost	0
Non-credit unrealized loss	0
Unrealized gain	75
Cumulative credit related OTTI	380
OTTI changes recorded in earnings	0	$ 0
Other Asset Backed [Member]
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized Cost	128,431		$ 117,431
Unrealized Gains	124		54
Unrealized Losses	483		581
Fair Value	128,072		116,904
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less Than Twelve Months, Fair Value	82,903		102,660
Less Than Twelve Months, Unrealized Losses	280		434
Twelve Months or More, Fair Value	9,804		5,189
Twelve Months or More, Unrealized Losses	203		147
Total, Fair Value	92,707		107,849
Total, Unrealized Losses	$ 483		581
Number of securities with market fair value less than amortized cost | Security	121
Obligations of States and Political Subdivisions [Member]
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized Cost	$ 147,411		145,193
Unrealized Gains	1,644		941
Unrealized Losses	710		1,150
Fair Value	148,345		144,984
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less Than Twelve Months, Fair Value	22,296		52,493
Less Than Twelve Months, Unrealized Losses	282		597
Twelve Months or More, Fair Value	9,737		12,240
Twelve Months or More, Unrealized Losses	428		553
Total, Fair Value	32,033		64,733
Total, Unrealized Losses	$ 710		1,150
Number of securities with market fair value less than amortized cost | Security	44
Corporate [Member]
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized Cost	$ 49,565		38,895
Unrealized Gains	162		9
Unrealized Losses	217		290
Fair Value	49,510		38,614
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less Than Twelve Months, Fair Value	28,299		30,550
Less Than Twelve Months, Unrealized Losses	208		290
Twelve Months or More, Fair Value	991		0
Twelve Months or More, Unrealized Losses	9		0
Total, Fair Value	29,290		30,550
Total, Unrealized Losses	$ 217		290
Number of securities with market fair value less than amortized cost | Security	23
Trust Preferred [Member]
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized Cost	$ 2,918		2,916
Unrealized Gains	0		0
Unrealized Losses	615		433
Fair Value	2,303		2,483
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	2,303		2,483
Twelve Months or More, Unrealized Losses	615		433
Total, Fair Value	2,303		2,483
Total, Unrealized Losses	$ 615		433
Number of securities with market fair value less than amortized cost | Security	3
Number of securities rated as investment grade | Security	1
Number of securities rated as below investment grade | Security	1
Number of major credit rating agencies | Security	2
Number of securities non-rated | Security	1
Non-rated trust preferred securities, amortized cost	$ 1,000
Non-rated trust preferred securities, fair value	800
Rated Issues [Member]
Trust preferred securities [Abstract]
Fair Value	1,550		1,690
Net Unrealized Loss	(368)		(226)
Unrated Issues [Member]
Trust preferred securities [Abstract]
Fair Value	753		793
Net Unrealized Loss	(247)		$ (207)
Foreign Government [Member]
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized Cost	1,654
Unrealized Gains	0
Unrealized Losses	15
Fair Value	1,639
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less Than Twelve Months, Fair Value	1,639
Less Than Twelve Months, Unrealized Losses	15
Twelve Months or More, Fair Value	0
Twelve Months or More, Unrealized Losses	0
Total, Fair Value	1,639
Total, Unrealized Losses	$ 15
Number of securities with market fair value less than amortized cost | Security	1