Securities (Details) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2016 USD ($) Security	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) Security	Sep. 30, 2015 USD ($)	Dec. 31, 2015 USD ($) Security
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized Cost	$ 598,831		$ 598,831		$ 585,851
Unrealized Gains	6,313		6,313		3,152
Unrealized Losses	2,032		2,032		3,519
Fair Value	603,112		603,112		585,484
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less Than Twelve Months, Fair Value	84,019		84,019		272,152
Less Than Twelve Months, Unrealized Losses	284		284		1,744
Twelve Months or More, Fair Value	66,475		66,475		55,638
Twelve Months or More, Unrealized Losses	1,748		1,748		1,775
Total, Fair Value	150,494		150,494		327,790
Total, Unrealized Losses	2,032		2,032		3,519
Private Label Mortgage Backed Securities Below Investment Grade [Abstract]
Fair value	2,556		2,556
Amortized cost	2,367		2,367
Non-credit unrealized loss	0		0
Unrealized gain	189		189
Cumulative credit related OTTI	1,594		1,594
OTTI changes recorded in earnings	0	$ 0	0	$ 0
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Balance at beginning of period	1,844	1,844	1,844	1,844	1,844
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	0	0	0
Balance at end of period	1,844	1,844	1,844	1,844	1,844
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]
Maturing within one year	23,706		23,706
Maturing after one year but within five years	86,673		86,673
Maturing after five years but within ten years	63,799		63,799
Maturing after ten years	67,186		67,186
Available-for-sale securities, debt maturities, amortized cost basis	241,364		241,364
U.S. agency residential mortgage-backed	168,233		168,233
U.S. agency commercial mortgage-backed	13,694		13,694
Private label residential mortgage-backed	33,482		33,482
Other asset backed	142,058		142,058
Total	598,831		598,831
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Maturing within one year	23,753		23,753
Maturing after one year but within five years	87,599		87,599
Maturing after five years but within ten years	64,784		64,784
Maturing after ten years	67,360		67,360
Total available-for-sale securities fair value	243,496		243,496
U.S. agency residential mortgage-backed	169,958		169,958
U.S. agency commercial mortgage-backed	13,892		13,892
Private label residential mortgage-backed	33,578		33,578
Other asset backed	142,188		142,188
Total	603,112		603,112
Gain and losses realized on sale of securities available for sale [Abstract]
Proceeds			56,451	11,786
Realized gains			350	75
Realized losses			52	0
Trading securities, realized gains			4	22
Credit related OTTI recognized in earnings	0	0
U.S. Agency [Member]
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized Cost	29,482		29,482		47,283
Unrealized Gains	508		508		309
Unrealized Losses	41		41		80
Fair Value	29,949		29,949		47,512
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less Than Twelve Months, Fair Value	1,604		1,604		12,164
Less Than Twelve Months, Unrealized Losses	3		3		47
Twelve Months or More, Fair Value	8,147		8,147		6,746
Twelve Months or More, Unrealized Losses	38		38		33
Total, Fair Value	9,751		9,751		18,910
Total, Unrealized Losses	$ 41		$ 41		80
Number of securities with market fair value less than amortized cost | Security	21		21
U.S. Agency Residential Mortgage-Backed [Member]
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized Cost	$ 168,233		$ 168,233		195,055
Unrealized Gains	1,857		1,857		1,584
Unrealized Losses	132		132		583
Fair Value	169,958		169,958		196,056
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less Than Twelve Months, Fair Value	22,982		22,982		57,538
Less Than Twelve Months, Unrealized Losses	48		48		316
Twelve Months or More, Fair Value	19,099		19,099		23,340
Twelve Months or More, Unrealized Losses	84		84		267
Total, Fair Value	42,081		42,081		80,878
Total, Unrealized Losses	$ 132		$ 132		583
Number of securities with market fair value less than amortized cost | Security	59		59
U.S. Agency Commercial Mortgage-Backed [Member]
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized Cost	$ 13,694		$ 13,694		34,017
Unrealized Gains	214		214		94
Unrealized Losses	16		16		83
Fair Value	13,892		13,892		34,028
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less Than Twelve Months, Fair Value	3,455		3,455		16,747
Less Than Twelve Months, Unrealized Losses	14		14		60
Twelve Months or More, Fair Value	257		257		2,247
Twelve Months or More, Unrealized Losses	2		2		23
Total, Fair Value	3,712		3,712		18,994
Total, Unrealized Losses	$ 16		$ 16		83
Number of securities with market fair value less than amortized cost | Security	7		7
Private Label Mortgage-Backed [Member]
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized Cost	$ 33,482		$ 33,482		5,061
Unrealized Gains	374		374		161
Unrealized Losses	278		278		319
Fair Value	33,578		33,578		4,903
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less Than Twelve Months, Fair Value	12,202		12,202		0
Less Than Twelve Months, Unrealized Losses	18		18		0
Twelve Months or More, Fair Value	1,429		1,429		3,393
Twelve Months or More, Unrealized Losses	260		260		319
Total, Fair Value	13,631		13,631		3,393
Total, Unrealized Losses	$ 278		$ 278		$ 319
Number of securities with market fair value less than amortized cost | Security	24		24
Number of securities purchased prior to 2016 | Security					4
Number of securities with impairment in excess of ten percent | Security	2		2
Percentage of excess impairment on securities	10.00%		10.00%
Number of securities with impairment for more than 12 months | Security	3		3
Private Label Mortgage Backed Securities Below Investment Grade [Abstract]
Number of private label mortgage backed securities complete recovery of cost basis | Security	4		4
Number of private label mortgage backed securities currently with OTTI unrealized gains | Security	3		3
Number of private label mortgage backed securities with OTTI unrealized loss less than previous OTTI credit | Security	3		3
Senior Security [Member]
Private Label Mortgage Backed Securities Below Investment Grade [Abstract]
Fair value	$ 1,346		$ 1,346
Amortized cost	1,303		1,303
Non-credit unrealized loss	0		0
Unrealized gain	43		43
Cumulative credit related OTTI	757		757
OTTI changes recorded in earnings	0	0	0	0
Super Senior Security [Member]
Private Label Mortgage Backed Securities Below Investment Grade [Abstract]
Fair value	1,135		1,135
Amortized cost	1,064		1,064
Non-credit unrealized loss	0		0
Unrealized gain	71		71
Cumulative credit related OTTI	457		457
OTTI changes recorded in earnings	0	0	0	0
Senior Support Security [Member]
Private Label Mortgage Backed Securities Below Investment Grade [Abstract]
Fair value	75		75
Amortized cost	0		0
Non-credit unrealized loss	0		0
Unrealized gain	75		75
Cumulative credit related OTTI	380		380
OTTI changes recorded in earnings	0	$ 0	0	$ 0
Other Asset Backed [Member]
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized Cost	142,058		142,058		$ 117,431
Unrealized Gains	435		435		54
Unrealized Losses	305		305		581
Fair Value	142,188		142,188		116,904
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less Than Twelve Months, Fair Value	22,147		22,147		102,660
Less Than Twelve Months, Unrealized Losses	96		96		434
Twelve Months or More, Fair Value	16,998		16,998		5,189
Twelve Months or More, Unrealized Losses	209		209		147
Total, Fair Value	39,145		39,145		107,849
Total, Unrealized Losses	$ 305		$ 305		581
Number of securities with market fair value less than amortized cost | Security	70		70
Obligations of States and Political Subdivisions [Member]
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized Cost	$ 156,539		$ 156,539		145,193
Unrealized Gains	2,115		2,115		941
Unrealized Losses	665		665		1,150
Fair Value	157,989		157,989		144,984
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less Than Twelve Months, Fair Value	17,853		17,853		52,493
Less Than Twelve Months, Unrealized Losses	91		91		597
Twelve Months or More, Fair Value	15,203		15,203		12,240
Twelve Months or More, Unrealized Losses	574		574		553
Total, Fair Value	33,056		33,056		64,733
Total, Unrealized Losses	$ 665		$ 665		1,150
Number of securities with market fair value less than amortized cost | Security	100		100
Number of securities with impairment in excess of ten percent | Security	1		1
Percentage of excess impairment on securities	10.00%		10.00%
Corporate [Member]
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized Cost	$ 50,787		$ 50,787		38,895
Unrealized Gains	792		792		9
Unrealized Losses	124		124		290
Fair Value	51,455		51,455		38,614
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less Than Twelve Months, Fair Value	3,776		3,776		30,550
Less Than Twelve Months, Unrealized Losses	14		14		290
Twelve Months or More, Fair Value	2,892		2,892		0
Twelve Months or More, Unrealized Losses	110		110		0
Total, Fair Value	6,668		6,668		30,550
Total, Unrealized Losses	$ 124		$ 124		290
Number of securities with market fair value less than amortized cost | Security	7		7
Trust Preferred [Member]
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized Cost	$ 2,921		$ 2,921		2,916
Unrealized Gains	0		0		0
Unrealized Losses	471		471		433
Fair Value	2,450		2,450		2,483
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less Than Twelve Months, Fair Value	0		0		0
Less Than Twelve Months, Unrealized Losses	0		0		0
Twelve Months or More, Fair Value	2,450		2,450		2,483
Twelve Months or More, Unrealized Losses	471		471		433
Total, Fair Value	2,450		2,450		2,483
Total, Unrealized Losses	$ 471		$ 471		433
Number of securities with market fair value less than amortized cost | Security	3		3
Number of securities rated as investment grade | Security	1		1
Number of securities rated as below investment grade | Security	1		1
Number of major credit rating agencies | Security	2		2
Number of securities non-rated | Security	1		1
Non-rated trust preferred securities, amortized cost	$ 1,000		$ 1,000
Non-rated trust preferred securities, fair value	700		700
Rated Issues [Member]
Trust preferred securities [Abstract]
Fair Value	1,735		1,735		1,690
Net Unrealized Loss			(186)		(226)
Unrated Issues [Member]
Trust preferred securities [Abstract]
Fair Value	715		715		793
Net Unrealized Loss			(285)		$ (207)
Foreign Government [Member]
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized Cost	1,635		1,635
Unrealized Gains	18		18
Unrealized Losses	0		0
Fair Value	$ 1,653		$ 1,653