Securities (Details) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2017 USD ($) Security	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($) Security	Jun. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized Cost	$ 580,670		$ 580,670		$ 615,709
Unrealized Gains	5,060		5,060		2,548
Unrealized Losses	2,005		2,005		7,641
Fair Value	583,725		583,725		610,616
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less Than Twelve Months, Fair Value	135,340		135,340		286,522
Less Than Twelve Months, Unrealized Losses	1,149		1,149		5,739
Twelve Months or More, Fair Value	50,180		50,180		68,405
Twelve Months or More, Unrealized Losses	856		856		1,902
Total, Fair Value	185,520		185,520		354,927
Total, Unrealized Losses	2,005		2,005		7,641
Private Label Mortgage Backed Securities Below Investment Grade [Abstract]
Fair value	2,159		2,159
Amortized cost	1,891		1,891
Non-credit unrealized loss	0		0
Unrealized gain	268		268
Cumulative credit related OTTI	1,594		1,594
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Balance at beginning of period	1,844	$ 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	30,555		30,555
Maturing after one year but within five years	99,193		99,193
Maturing after five years but within ten years	86,846		86,846
Maturing after ten years	56,975		56,975
Available-for-sale securities, debt maturities, amortized cost basis	273,569		273,569
U.S. agency residential mortgage-backed	143,670		143,670
U.S. agency commercial mortgage-backed	11,573		11,573
Private label mortgage-backed	25,150		25,150
Other asset backed	126,708		126,708
Total	580,670		580,670
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Maturing within one year	30,608		30,608
Maturing after one year but within five years	99,956		99,956
Maturing after five years but within ten years	88,012		88,012
Maturing after ten years	56,858		56,858
Total available-for-sale securities fair value	275,434		275,434
U.S. agency residential mortgage-backed	144,484		144,484
U.S. agency commercial mortgage-backed	11,577		11,577
Private label mortgage-backed	25,332		25,332
Other asset backed	126,898		126,898
Total	583,725		583,725
Gain and losses realized on sale of securities available for sale [Abstract]
Proceeds			7,830	55,362
Realized gains			117	336
Realized losses			0	53
Credit related OTTI recognized in earnings	0	$ 0	0	0
Trading securities, realized gains (losses)			(124)	$ 64
Cumulative Retrospective Adjustments [Member] | ASU 2017-08 [Member]
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Adjustment in amortized cost of available for sale securities					(460)
U.S. Agency [Member]
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized Cost	28,179		28,179		28,909
Unrealized Gains	248		248		159
Unrealized Losses	29		29		80
Fair Value	28,398		28,398		28,988
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less Than Twelve Months, Fair Value	2,841		2,841		4,179
Less Than Twelve Months, Unrealized Losses	17		17		41
Twelve Months or More, Fair Value	4,920		4,920		8,217
Twelve Months or More, Unrealized Losses	12		12		39
Total, Fair Value	7,761		7,761		12,396
Total, Unrealized Losses	$ 29		$ 29		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	$ 143,670		$ 143,670		156,053
Unrealized Gains	1,309		1,309		1,173
Unrealized Losses	495		495		937
Fair Value	144,484		144,484		156,289
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less Than Twelve Months, Fair Value	32,667		32,667		62,524
Less Than Twelve Months, Unrealized Losses	260		260		732
Twelve Months or More, Fair Value	21,433		21,433		20,857
Twelve Months or More, Unrealized Losses	235		235		205
Total, Fair Value	54,100		54,100		83,381
Total, Unrealized Losses	$ 495		$ 495		937
Number of securities with market fair value less than amortized cost | Security	103		103
U.S. Agency Commercial Mortgage-Backed [Member]
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized Cost	$ 11,573		$ 11,573		12,799
Unrealized Gains	107		107		28
Unrealized Losses	103		103		195
Fair Value	11,577		11,577		12,632
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less Than Twelve Months, Fair Value	6,147		6,147		6,079
Less Than Twelve Months, Unrealized Losses	102		102		194
Twelve Months or More, Fair Value	122		122		143
Twelve Months or More, Unrealized Losses	1		1		1
Total, Fair Value	6,269		6,269		6,222
Total, Unrealized Losses	$ 103		$ 103		195
Number of securities with market fair value less than amortized cost | Security	11		11
Private Label Mortgage-Backed [Member]
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized Cost	$ 25,150		$ 25,150		35,035
Unrealized Gains	426		426		216
Unrealized Losses	244		244		524
Fair Value	25,332		25,332		34,727
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less Than Twelve Months, Fair Value	5,002		5,002		20,545
Less Than Twelve Months, Unrealized Losses	66		66		281
Twelve Months or More, Fair Value	1,143		1,143		1,413
Twelve Months or More, Unrealized Losses	178		178		243
Total, Fair Value	6,145		6,145		21,958
Total, Unrealized Losses	$ 244		$ 244		524
Number of securities with market fair value less than amortized cost | Security	14		14
Number of securities purchased prior to 2016 | Security	3		3
Number of securities with impairment in excess of ten percent | Security	1		1
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 currently with OTTI unrealized gains | Security	3		3
Number of private label mortgage backed securities complete recovery of cost basis | Security	3		3
Senior Security [Member]
Private Label Mortgage Backed Securities Below Investment Grade [Abstract]
Fair value	$ 1,133		$ 1,133
Amortized cost	1,003		1,003
Non-credit unrealized loss	0		0
Unrealized gain	130		130
Cumulative credit related OTTI	757		757
Super Senior Security [Member]
Private Label Mortgage Backed Securities Below Investment Grade [Abstract]
Fair value	955		955
Amortized cost	888		888
Non-credit unrealized loss	0		0
Unrealized gain	67		67
Cumulative credit related OTTI	457		457
Senior Support Security [Member]
Private Label Mortgage Backed Securities Below Investment Grade [Abstract]
Fair value	71		71
Amortized cost	0		0
Non-credit unrealized loss	0		0
Unrealized gain	71		71
Cumulative credit related OTTI	380		380
Other Asset Backed [Member]
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized Cost	126,708		126,708		146,829
Unrealized Gains	327		327		271
Unrealized Losses	137		137		391
Fair Value	126,898		126,898		146,709
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less Than Twelve Months, Fair Value	25,998		25,998		52,958
Less Than Twelve Months, Unrealized Losses	38		38		172
Twelve Months or More, Fair Value	11,035		11,035		17,763
Twelve Months or More, Unrealized Losses	99		99		219
Total, Fair Value	37,033		37,033		70,721
Total, Unrealized Losses	$ 137		$ 137		391
Number of securities with market fair value less than amortized cost | Security	69		69
Obligations of States and Political Subdivisions [Member]
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized Cost	$ 178,729		$ 178,729		175,180
Unrealized Gains	1,787		1,787		478
Unrealized Losses	752		752		4,759
Fair Value	179,764		179,764		170,899
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less Than Twelve Months, Fair Value	50,302		50,302		113,078
Less Than Twelve Months, Unrealized Losses	611		611		4,014
Twelve Months or More, Fair Value	6,788		6,788		14,623
Twelve Months or More, Unrealized Losses	141		141		745
Total, Fair Value	57,090		57,090		127,701
Total, Unrealized Losses	$ 752		$ 752		4,759
Number of securities with market fair value less than amortized cost | Security	183		183
Corporate [Member]
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized Cost	$ 61,629		$ 61,629		56,356
Unrealized Gains	856		856		223
Unrealized Losses	76		76		399
Fair Value	62,409		62,409		56,180
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less Than Twelve Months, Fair Value	10,281		10,281		25,546
Less Than Twelve Months, Unrealized Losses	51		51		292
Twelve Months or More, Fair Value	1,978		1,978		2,810
Twelve Months or More, Unrealized Losses	25		25		107
Total, Fair Value	12,259		12,259		28,356
Total, Unrealized Losses	$ 76		$ 76		399
Number of securities with market fair value less than amortized cost | Security	13		13
Trust Preferred [Member]
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized Cost	$ 2,926		$ 2,926		2,922
Unrealized Gains	0		0		0
Unrealized Losses	165		165		343
Fair Value	2,761		2,761		2,579
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	2,761		2,761		2,579
Twelve Months or More, Unrealized Losses	165		165		343
Total, Fair Value	2,761		2,761		2,579
Total, Unrealized Losses	$ 165		$ 165		343
Number of securities with market fair value less than amortized cost | Security	3		3
Number of issues rated as investment grade | Security	1		1
Number of securities rated as below investment grade | Security	1		1
Number of major credit rating agencies rating securities with fair value less than amortized cost | 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	900		900
Rated Issues [Member]
Trust preferred securities [Abstract]
Fair Value	1,844		1,844		1,800
Net Unrealized Loss			(82)		(123)
Unrated Issues [Member]
Trust preferred securities [Abstract]
Fair Value	917		917		779
Net Unrealized Loss			(83)		(220)
Foreign Government [Member]
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized Cost	2,106		2,106		1,626
Unrealized Gains	0		0		0
Unrealized Losses	4		4		13
Fair Value	2,102		2,102		1,613
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less Than Twelve Months, Fair Value	2,102		2,102		1,613
Less Than Twelve Months, Unrealized Losses	4		4		13
Twelve Months or More, Fair Value	0		0		0
Twelve Months or More, Unrealized Losses	0		0		0
Total, Fair Value	2,102		2,102		1,613
Total, Unrealized Losses	$ 4		$ 4		$ 13
Number of securities with market fair value less than amortized cost | Security	2		2