Securities Portfolio (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($) Security	Dec. 31, 2015 USD ($) Security
Amortized cost and fair value of securities held-to-maturity [Abstract]
Carrying value	$ 0	$ 0
Unamortized unrealized transfer losses		0
Amortized cost		0
Gross unrealized gains		0
Gross unrealized losses		0
Fair Value	0	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Losses [Abstract]
Total		0
Available-for-sale Securities and Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]
Less Than Twelve Months	3,166	897
More Than Twelve Months	1	1,303
Total	3,167	2,200
Available-for-sale Securities and Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less Than Twelve Months	129,682	69,065
More Than Twelve Months	100	52,381
Total	$ 129,782	$ 121,446
Available-for-sale Securities and Held-to-maturity Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]
Number of available-for-sale and held-to-maturity securities | Security	98	45
Unamortized market adjustment on securities transferred to held-to-maturity and subsequently returned to available-for-sale	$ 0	$ 4,197
Unamortized market adjustment on securities transferred to held-to-maturity and subsequently returned to available-for-sale, tax	0	1,427
Unamortized market adjustment on securities transferred to held-to-maturity and subsequently returned to available-for-sale, net of tax	0	2,770
Carrying value of securities transferred from held-to-maturity to available-for-sale	0	85,555
Amortized cost and fair value of securities available-for-sale [Abstract]
Amortized cost	202,000	215,064
Gross unrealized gains	532	1,328
Gross unrealized losses	(3,167)	(2,200)
Fair value	199,365	214,192
Securities pledged as collateral	72,908	119,790
Securities Available-for-Sale, Gross Unrealized Losses [Abstract]
Less Than Twelve Months	3,166	897
More Than Twelve Months	1	1,303
Total	3,167	2,200
Securities Available-for-Sale, Fair Value [Abstract]
Less Than Twelve Months	129,682	69,065
More Than Twelve Months	100	52,381
Total	$ 129,782	$ 121,446
Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]
Number of securities available-for-sale | Security	98	45
Available-for-Sale, Amortized Cost [Abstract]
Due in one year or less	$ 21,801
Due after one year through five years	18,471
Due after five years through ten years	48,840
Due after ten years	112,141
Total debt securities	201,253
Other securities without stated maturities	747
Total securities	202,000
Available-for-Sale, Fair Value [Abstract]
Due in one year or less	21,800
Due after one year through five years	18,435
Due after five years through ten years	48,217
Due after ten years	110,102
Total debt securities	198,554
Other securities without stated maturities	811
Fair Value	199,365
Information about securities sold [Abstract]
Proceeds from sales	107,647	$ 23,005
Gross realized gains	578	76
Gross realized losses	56	0
U.S. Treasury Securities [Member]
Amortized cost and fair value of securities available-for-sale [Abstract]
Amortized cost	20,000	0
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Fair value	20,000	0
Securities Available-for-Sale, Gross Unrealized Losses [Abstract]
Less Than Twelve Months	0	0
More Than Twelve Months	0	0
Total	0	0
Securities Available-for-Sale, Fair Value [Abstract]
Less Than Twelve Months	0	0
More Than Twelve Months	0	0
Total	$ 0	$ 0
Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]
Number of securities available-for-sale | Security	0	0
Obligations of US Government Agencies [Member]
Amortized cost and fair value of securities available-for-sale [Abstract]
Amortized cost	$ 9,361	$ 24,353
Gross unrealized gains	0	1
Gross unrealized losses	(166)	(114)
Fair value	9,195	24,240
Securities Available-for-Sale, Gross Unrealized Losses [Abstract]
Less Than Twelve Months	166	0
More Than Twelve Months	0	114
Total	166	114
Securities Available-for-Sale, Fair Value [Abstract]
Less Than Twelve Months	9,195	0
More Than Twelve Months	0	3,940
Total	$ 9,195	$ 3,940
Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]
Number of securities available-for-sale | Security	6	2
Obligations of States and Political Subdivisions [Member]
Amortized cost and fair value of securities available-for-sale [Abstract]
Amortized cost	$ 78,645	$ 77,223
Gross unrealized gains	358	1,323
Gross unrealized losses	(1,016)	(113)
Fair value	77,987	78,433
Securities Available-for-Sale, Gross Unrealized Losses [Abstract]
Less Than Twelve Months	1,016	42
More Than Twelve Months	0	71
Total	1,016	113
Securities Available-for-Sale, Fair Value [Abstract]
Less Than Twelve Months	38,020	4,177
More Than Twelve Months	0	3,545
Total	$ 38,020	$ 7,722
Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]
Number of securities available-for-sale | Security	56	13
Mortgage-backed Securities [Member]
Amortized cost and fair value of securities available-for-sale [Abstract]
Amortized cost	$ 85,649	$ 109,360
Gross unrealized gains	18	0
Gross unrealized losses	(1,973)	(1,964)
Fair value	83,694	107,396
Securities Available-for-Sale, Gross Unrealized Losses [Abstract]
Less Than Twelve Months	1,973	848
More Than Twelve Months	0	1,116
Total	1,973	1,964
Securities Available-for-Sale, Fair Value [Abstract]
Less Than Twelve Months	80,680	62,698
More Than Twelve Months	0	44,698
Total	$ 80,680	$ 107,396
Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]
Number of securities available-for-sale | Security	23	13
Money Market Investments [Member]
Amortized cost and fair value of securities available-for-sale [Abstract]
Amortized cost	$ 647	$ 631
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Fair value	647	631
Securities Available-for-Sale, Gross Unrealized Losses [Abstract]
Total	0	0
Corporate Bonds and Other Securities [Member]
Amortized cost and fair value of securities available-for-sale [Abstract]
Amortized cost	7,598	3,397
Gross unrealized gains	92	4
Gross unrealized losses	(12)	(8)
Fair value	7,678	3,393
Securities Available-for-Sale, Gross Unrealized Losses [Abstract]
Less Than Twelve Months	11	6
More Than Twelve Months	1	2
Total	12	8
Securities Available-for-Sale, Fair Value [Abstract]
Less Than Twelve Months	1,787	2,091
More Than Twelve Months	100	198
Total	$ 1,887	$ 2,289
Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]
Number of securities available-for-sale | Security	13	16
Other Marketable Equity Securities [Member]
Amortized cost and fair value of securities available-for-sale [Abstract]
Amortized cost	$ 100	$ 100
Gross unrealized gains	64	0
Gross unrealized losses	0	(1)
Fair value	164	99
Securities Available-for-Sale, Gross Unrealized Losses [Abstract]
Less Than Twelve Months	0	1
More Than Twelve Months	0	0
Total	0	1
Securities Available-for-Sale, Fair Value [Abstract]
Less Than Twelve Months	0	99
More Than Twelve Months	0	0
Total	$ 0	$ 99
Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]
Number of securities available-for-sale | Security	0	1
Obligations of US Government Agencies [Member]
Amortized cost and fair value of securities held-to-maturity [Abstract]
Carrying value		$ 0
Unamortized unrealized transfer losses		0
Amortized cost		0
Gross unrealized gains		0
Gross unrealized losses		0
Fair Value		0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Losses [Abstract]
Total		0
Obligations of States and Political Subdivisions [Member]
Amortized cost and fair value of securities held-to-maturity [Abstract]
Carrying value		0
Unamortized unrealized transfer losses		0
Amortized cost		0
Gross unrealized gains		0
Gross unrealized losses		0
Fair Value		0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Losses [Abstract]
Total		0
Mortgage-backed Securities [Member]
Amortized cost and fair value of securities held-to-maturity [Abstract]
Carrying value		0
Unamortized unrealized transfer losses		0
Amortized cost		0
Gross unrealized gains		0
Gross unrealized losses		0
Fair Value		0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Losses [Abstract]
Total		$ 0