Securities (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2017 USD ($) Security	Mar. 31, 2016 USD ($)	Dec. 31, 2016 USD ($)
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized Cost	$ 610,100		$ 615,709
Unrealized Gains	3,088		2,548
Unrealized Losses	4,224		7,641
Fair Value	608,964		610,616
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less Than Twelve Months, Fair Value	233,173		286,522
Less Than Twelve Months, Unrealized Losses	3,178		5,739
Twelve Months or More, Fair Value	56,497		68,405
Twelve Months or More, Unrealized Losses	1,046		1,902
Total, Fair Value	289,670		354,927
Total, Unrealized Losses	4,224		7,641
Private Label Mortgage Backed Securities Below Investment Grade [Abstract]
Fair value	2,212
Amortized cost	2,050
Non-credit unrealized loss	0
Unrealized gain	162
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	20,583
Maturing after one year but within five years	107,748
Maturing after five years but within ten years	85,047
Maturing after ten years	62,315
Available-for-sale securities, debt maturities, amortized cost basis	275,693
U.S. agency residential mortgage-backed	147,432
U.S. agency commercial mortgage-backed	12,298
Private label residential mortgage-backed	29,018
Other asset backed	145,659
Total	610,100
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Maturing within one year	20,596
Maturing after one year but within five years	107,791
Maturing after five years but within ten years	84,667
Maturing after ten years	61,206
Total available-for-sale securities fair value	274,260
U.S. agency residential mortgage-backed	147,874
U.S. agency commercial mortgage-backed	12,195
Private label residential mortgage-backed	28,840
Other asset backed	145,795
Total	608,964
Gain and losses realized on sale of securities available for sale [Abstract]
Proceeds	6,152	42,391
Realized gains	106	226
Realized losses	0	52
Trading securities, realized losses	(79)	(12)
Credit related OTTI recognized in earnings	0	0
Cumulative Retrospective Adjustments [Member] | ASU 2017-08 [Member]
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Adjustment in Amortization on Available for Sale Securities			460
U.S. Agency [Member]
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized Cost	28,636		28,909
Unrealized Gains	211		159
Unrealized Losses	63		80
Fair Value	28,784		28,988
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less Than Twelve Months, Fair Value	3,721		4,179
Less Than Twelve Months, Unrealized Losses	24		41
Twelve Months or More, Fair Value	7,707		8,217
Twelve Months or More, Unrealized Losses	39		39
Total, Fair Value	11,428		12,396
Total, Unrealized Losses	$ 63		80
Number of securities with market fair value less than amortized cost | Security	23
U.S. Agency Residential Mortgage-Backed [Member]
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized Cost	$ 147,432		156,053
Unrealized Gains	1,165		1,173
Unrealized Losses	723		937
Fair Value	147,874		156,289
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less Than Twelve Months, Fair Value	46,206		62,524
Less Than Twelve Months, Unrealized Losses	537		732
Twelve Months or More, Fair Value	20,682		20,857
Twelve Months or More, Unrealized Losses	186		205
Total, Fair Value	66,888		83,381
Total, Unrealized Losses	$ 723		937
Number of securities with market fair value less than amortized cost | Security	118
U.S. Agency Commercial Mortgage-Backed [Member]
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized Cost	$ 12,298		12,799
Unrealized Gains	52		28
Unrealized Losses	155		195
Fair Value	12,195		12,632
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less Than Twelve Months, Fair Value	6,672		6,079
Less Than Twelve Months, Unrealized Losses	154		194
Twelve Months or More, Fair Value	140		143
Twelve Months or More, Unrealized Losses	1		1
Total, Fair Value	6,812		6,222
Total, Unrealized Losses	$ 155		195
Number of securities with market fair value less than amortized cost | Security	13
Private Label Mortgage-Backed [Member]
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized Cost	$ 29,018		35,035
Unrealized Gains	218		216
Unrealized Losses	396		524
Fair Value	28,840		34,727
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less Than Twelve Months, Fair Value	17,038		20,545
Less Than Twelve Months, Unrealized Losses	173		281
Twelve Months or More, Fair Value	1,321		1,413
Twelve Months or More, Unrealized Losses	223		243
Total, Fair Value	18,359		21,958
Total, Unrealized Losses	$ 396		524
Number of securities with market fair value less than amortized cost | Security	30
Number of securities purchased prior to 2016 | Security	4
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 currently with OTTI unrealized gains | Security	3
Senior Security [Member]
Private Label Mortgage Backed Securities Below Investment Grade [Abstract]
Fair value	$ 1,127
Amortized cost	1,092
Non-credit unrealized loss	0
Unrealized gain	35
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	1,013
Amortized cost	958
Non-credit unrealized loss	0
Unrealized gain	55
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	72
Amortized cost	0
Non-credit unrealized loss	0
Unrealized gain	72
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	145,659		146,829
Unrealized Gains	346		271
Unrealized Losses	210		391
Fair Value	145,795		146,709
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less Than Twelve Months, Fair Value	39,168		52,958
Less Than Twelve Months, Unrealized Losses	95		172
Twelve Months or More, Fair Value	11,949		17,763
Twelve Months or More, Unrealized Losses	115		219
Total, Fair Value	51,117		70,721
Total, Unrealized Losses	$ 210		391
Number of securities with market fair value less than amortized cost | Security	97
Obligations of States and Political Subdivisions [Member]
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized Cost	$ 181,727		175,180
Unrealized Gains	716		478
Unrealized Losses	2,193		4,759
Fair Value	180,250		170,899
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less Than Twelve Months, Fair Value	103,301		113,078
Less Than Twelve Months, Unrealized Losses	2,030		4,014
Twelve Months or More, Fair Value	10,090		14,623
Twelve Months or More, Unrealized Losses	163		745
Total, Fair Value	113,391		127,701
Total, Unrealized Losses	$ 2,193		4,759
Number of securities with market fair value less than amortized cost | Security	308
Number of securities with impairment in excess of ten percent | Security	28
Percentage of excess impairment on securities	10.00%
Corporate [Member]
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized Cost	$ 60,790		56,356
Unrealized Gains	380		223
Unrealized Losses	203		399
Fair Value	60,967		56,180
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less Than Twelve Months, Fair Value	15,461		25,546
Less Than Twelve Months, Unrealized Losses	155		292
Twelve Months or More, Fair Value	1,955		2,810
Twelve Months or More, Unrealized Losses	48		107
Total, Fair Value	17,416		28,356
Total, Unrealized Losses	$ 203		399
Number of securities with market fair value less than amortized cost | Security	19
Trust Preferred [Member]
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized Cost	$ 2,924		2,922
Unrealized Gains	0		0
Unrealized Losses	271		343
Fair Value	2,653		2,579
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	2,653		2,579
Twelve Months or More, Unrealized Losses	271		343
Total, Fair Value	2,653		2,579
Total, Unrealized Losses	$ 271		343
Number of securities with market fair value less than amortized cost | Security	3
Number of issues rated as investment grade | Security	1
Number of securities rated as below investment grade | Security	1
Number of major credit rating agencies rating securities with fair value less than amortized cost | 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	1,812		1,800
Net Unrealized Loss	(112)		(123)
Unrated Issues [Member]
Trust preferred securities [Abstract]
Fair Value	841		779
Net Unrealized Loss	(159)		(220)
Foreign Government [Member]
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized Cost	1,616		1,626
Unrealized Gains	0		0
Unrealized Losses	10		13
Fair Value	1,606		1,613
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less Than Twelve Months, Fair Value	1,606		1,613
Less Than Twelve Months, Unrealized Losses	10		13
Twelve Months or More, Fair Value	0		0
Twelve Months or More, Unrealized Losses	0		0
Total, Fair Value	1,606		1,613
Total, Unrealized Losses	$ 10		$ 13
Number of securities with market fair value less than amortized cost | Security	1