Securities (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018 USD ($) Security	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) Security	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized Cost	$ 443,744		$ 443,744		$ 523,520
Unrealized Gains	1,602		1,602		3,197
Unrealized Losses	8,389		8,389		3,792
Fair Value	436,957		436,957		522,925
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less Than Twelve Months, Fair Value	163,283		163,283		153,090
Less Than Twelve Months, Unrealized Losses	2,921		2,921		1,400
Twelve Months or More, Fair Value	139,602		139,602		108,033
Twelve Months or More, Unrealized Losses	5,468		5,468		2,392
Total, Fair Value	302,885		302,885		261,123
Total, Unrealized Losses	8,389		8,389		3,792
Credit related OTTI recognized in earnings	0	$ 0	0	$ 0
Private Label Mortgage Backed Securities Below Investment Grade [Abstract]
Fair value	1,682		1,682
Amortized cost	1,331		1,331
Non-credit unrealized loss	0		0
Unrealized gain	351		351
Cumulative credit related OTTI	1,594		1,594
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Balance at beginning of period	1,594	1,594	1,594	1,594
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	1,594	$ 1,594	1,594	$ 1,594
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]
Maturing within one year	14,513		14,513
Maturing after one year but within five years	79,683		79,683
Maturing after five years but within ten years	62,609		62,609
Maturing after ten years	46,142		46,142
Available-for-sale securities, debt maturities, amortized cost basis	202,947		202,947
U.S. agency residential mortgage-backed	126,851		126,851
U.S. agency commercial mortgage-backed	6,039		6,039
Private label mortgage-backed	29,340		29,340
Other asset backed	78,567		78,567
Amortized Cost	443,744		443,744		523,520
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Maturing within one year	14,494		14,494
Maturing after one year but within five years	78,634		78,634
Maturing after five years but within ten years	60,979		60,979
Maturing after ten years	44,475		44,475
Total available-for-sale securities fair value	198,582		198,582
U.S. agency residential mortgage-backed	125,061		125,061
U.S. agency commercial mortgage-backed	5,815		5,815
Private label mortgage-backed	28,973		28,973
Other asset backed	78,526		78,526
Total	436,957		436,957		522,925
U.S. Treasury [Member]
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized Cost					898
Unrealized Gains					0
Unrealized Losses					0
Fair Value					898
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]
Amortized Cost					898
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Total					898
U.S. Agency [Member]
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized Cost	20,769		20,769		25,667
Unrealized Gains	0		0		82
Unrealized Losses	346		346		67
Fair Value	20,423		20,423		25,682
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less Than Twelve Months, Fair Value	11,938		11,938		5,466
Less Than Twelve Months, Unrealized Losses	239		239		26
Twelve Months or More, Fair Value	8,485		8,485		5,735
Twelve Months or More, Unrealized Losses	107		107		41
Total, Fair Value	20,423		20,423		11,201
Total, Unrealized Losses	$ 346		$ 346		67
Number of securities with market fair value less than amortized cost | Security	51		51
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]
Amortized Cost	$ 20,769		$ 20,769		25,667
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Total	20,423		20,423		25,682
U.S. Agency Residential Mortgage-Backed [Member]
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized Cost	126,851		126,851		137,785
Unrealized Gains	802		802		1,116
Unrealized Losses	2,592		2,592		983
Fair Value	125,061		125,061		137,918
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less Than Twelve Months, Fair Value	28,672		28,672		22,198
Less Than Twelve Months, Unrealized Losses	765		765		229
Twelve Months or More, Fair Value	40,857		40,857		40,698
Twelve Months or More, Unrealized Losses	1,827		1,827		754
Total, Fair Value	69,529		69,529		62,896
Total, Unrealized Losses	$ 2,592		$ 2,592		983
Number of securities with market fair value less than amortized cost | Security	133		133
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]
Amortized Cost	$ 126,851		$ 126,851		137,785
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Total	125,061		125,061		137,918
U.S. Agency Commercial Mortgage-Backed [Member]
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized Cost	6,039		6,039		9,894
Unrealized Gains	0		0		36
Unrealized Losses	224		224		170
Fair Value	5,815		5,815		9,760
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less Than Twelve Months, Fair Value	1,358		1,358		2,181
Less Than Twelve Months, Unrealized Losses	12		12		34
Twelve Months or More, Fair Value	4,391		4,391		3,994
Twelve Months or More, Unrealized Losses	212		212		136
Total, Fair Value	5,749		5,749		6,175
Total, Unrealized Losses	$ 224		$ 224		170
Number of securities with market fair value less than amortized cost | Security	15		15
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]
Amortized Cost	$ 6,039		$ 6,039		9,894
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Total	5,815		5,815		9,760
Private Label Mortgage-Backed [Member]
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized Cost	29,340		29,340		29,011
Unrealized Gains	369		369		428
Unrealized Losses	736		736		330
Fair Value	28,973		28,973		29,109
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less Than Twelve Months, Fair Value	10,209		10,209		11,390
Less Than Twelve Months, Unrealized Losses	295		295		92
Twelve Months or More, Fair Value	8,473		8,473		4,396
Twelve Months or More, Unrealized Losses	441		441		238
Total, Fair Value	18,682		18,682		15,786
Total, Unrealized Losses	$ 736		$ 736		330
Number of securities with market fair value less than amortized cost | Security	27		27
Private Label Mortgage Backed Securities Below Investment Grade [Abstract]
Number of private label mortgage backed securities complete recovery of cost basis | Security	2		2
Number of private label mortgage backed securities currently with OTTI unrealized gains | Security	3		3
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]
Amortized Cost	$ 29,340		$ 29,340		29,011
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Total	28,973		28,973		29,109
Senior Security [Member]
Private Label Mortgage Backed Securities Below Investment Grade [Abstract]
Fair value	842		842
Amortized cost	698		698
Non-credit unrealized loss	0		0
Unrealized gain	144		144
Cumulative credit related OTTI	757		757
Super Senior Security [Member]
Private Label Mortgage Backed Securities Below Investment Grade [Abstract]
Fair value	808		808
Amortized cost	633		633
Non-credit unrealized loss	0		0
Unrealized gain	175		175
Cumulative credit related OTTI	457		457
Senior Support Security [Member]
Private Label Mortgage Backed Securities Below Investment Grade [Abstract]
Fair value	32		32
Amortized cost	0		0
Non-credit unrealized loss	0		0
Unrealized gain	32		32
Cumulative credit related OTTI	380		380
Other Asset Backed [Member]
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized Cost	78,567		78,567		93,811
Unrealized Gains	147		147		202
Unrealized Losses	188		188		115
Fair Value	78,526		78,526		93,898
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less Than Twelve Months, Fair Value	30,663		30,663		20,352
Less Than Twelve Months, Unrealized Losses	92		92		40
Twelve Months or More, Fair Value	11,226		11,226		16,648
Twelve Months or More, Unrealized Losses	96		96		75
Total, Fair Value	41,889		41,889		37,000
Total, Unrealized Losses	$ 188		$ 188		115
Number of securities with market fair value less than amortized cost | Security	72		72
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]
Amortized Cost	$ 78,567		$ 78,567		93,811
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Total	78,526		78,526		93,898
Obligations of States and Political Subdivisions [Member]
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized Cost	143,138		143,138		174,073
Unrealized Gains	219		219		755
Unrealized Losses	3,703		3,703		1,883
Fair Value	139,654		139,654		172,945
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less Than Twelve Months, Fair Value	59,590		59,590		76,574
Less Than Twelve Months, Unrealized Losses	1,157		1,157		936
Twelve Months or More, Fair Value	57,509		57,509		28,246
Twelve Months or More, Unrealized Losses	2,546		2,546		947
Total, Fair Value	117,099		117,099		104,820
Total, Unrealized Losses	$ 3,703		$ 3,703		1,883
Number of securities with market fair value less than amortized cost | Security	393		393
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]
Amortized Cost	$ 143,138		$ 143,138		174,073
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Total	139,654		139,654		172,945
Corporate [Member]
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized Cost	35,017		35,017		47,365
Unrealized Gains	65		65		578
Unrealized Losses	512		512		90
Fair Value	34,570		34,570		47,853
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less Than Twelve Months, Fair Value	20,853		20,853		14,440
Less Than Twelve Months, Unrealized Losses	361		361		33
Twelve Months or More, Fair Value	5,726		5,726		3,943
Twelve Months or More, Unrealized Losses	151		151		57
Total, Fair Value	26,579		26,579		18,383
Total, Unrealized Losses	$ 512		$ 512		90
Number of securities with market fair value less than amortized cost | Security	32		32
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]
Amortized Cost	$ 35,017		$ 35,017		47,365
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Total	34,570		34,570		47,853
Trust Preferred [Member]
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized Cost	1,963		1,963		2,929
Unrealized Gains	0		0		0
Unrealized Losses	38		38		127
Fair Value	1,925		1,925		2,802
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	925		925		2,802
Twelve Months or More, Unrealized Losses	38		38		127
Total, Fair Value	925		925		2,802
Total, Unrealized Losses	$ 38		$ 38		127
Number of securities with market fair value less than amortized cost | Security	1		1
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]
Amortized Cost	$ 1,963		$ 1,963		2,929
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Total	1,925		1,925		2,802
Foreign Government [Member]
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized Cost	2,060		2,060		2,087
Unrealized Gains	0		0		0
Unrealized Losses	50		50		27
Fair Value	2,010		2,010		2,060
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less Than Twelve Months, Fair Value	0		0		489
Less Than Twelve Months, Unrealized Losses	0		0		10
Twelve Months or More, Fair Value	2,010		2,010		1,571
Twelve Months or More, Unrealized Losses	50		50		17
Total, Fair Value	2,010		2,010		2,060
Total, Unrealized Losses	$ 50		$ 50		27
Number of securities with market fair value less than amortized cost | Security	2		2
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]
Amortized Cost	$ 2,060		$ 2,060		2,087
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Total	$ 2,010		$ 2,010		$ 2,060