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Stock-Based Compensation Plans (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) Plan $ / shares shares	Dec. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2016 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Abstract]
Number of compensation plans | Plan	2
Shares available for grant under 2014 LTIP Plan (in shares)	691,000
Additional Disclosures [Abstract]
Stock based compensation expense | $	$ 4,358	$ 3,818	$ 3,872
Tax benefit recognized related to all awards | $	1,090	$ 1,451	$ 1,471
Total compensation cost related to unvested equity awards | $	$ 4,206
Weighted-average period of recognition of cost	2 years
Service-Based Restricted Stock Awards [Member]
Shares or Units and Rights [Roll Forward]
Outstanding, beginning balance (in shares)	254,490	249,706	265,776
Granted/Issued (in shares)	141,722	135,986	138,102
Awards vested or rights exercised (in shares)	(132,872)	(128,691)	(138,472)
Forfeited (in shares)	(14,198)	(2,511)	(15,700)
Outstanding, ending balance (in shares)	249,142	254,490	249,706
Restricted units expected to vest (in shares)	249,142
Weighted-Average Award Price [Roll Forward]
Outstanding, beginning balance (in dollars per share) | $ / shares	$ 21.88	$ 21.22	$ 22.03
Granted/Issued (in dollars per share) | $ / shares	22.73	21.99	18.80
Awards vested or rights exercised (in dollars per share) | $ / shares	22.45	20.73	20.46
Forfeited (in dollars per share) | $ / shares	21.94	21.38	20.45
Outstanding, ending balance (in dollars per share) | $ / shares	22.05	$ 21.88	$ 21.22
Restricted units expected to vest (in dollars per share) | $ / shares	$ 22.05
Additional Disclosures [Abstract]
Fair value of vested shares | $	$ 2,594	$ 3,294	$ 2,533
Aggregate intrinsic value of outstanding awards | $	$ 4,679
Vesting period of awards	4 years
Performance-Based Restricted Stock Awards [Member]
Shares or Units and Rights [Roll Forward]
Outstanding, beginning balance (in shares)	179,774	147,614	78,714
Granted/Issued (in shares)	103,940	63,396	71,292
Awards vested or rights exercised (in shares)	(48,661)	(28,715)	(2,392)
Forfeited (in shares)	(25,299)	(2,521)	0
Outstanding, ending balance (in shares)	209,754	179,774	147,614
Restricted units expected to vest (in shares)	164,050
Weighted-Average Award Price [Roll Forward]
Outstanding, beginning balance (in dollars per share) | $ / shares	$ 21.42	$ 22.35	$ 25.68
Granted/Issued (in dollars per share) | $ / shares	22.95	22.04	18.80
Awards vested or rights exercised (in dollars per share) | $ / shares	24.10	27.81
Forfeited (in dollars per share) | $ / shares	21.40	20.60
Outstanding, ending balance (in dollars per share) | $ / shares	21.56	$ 21.42	$ 22.35
Restricted units expected to vest (in dollars per share) | $ / shares	$ 21.29
Additional Disclosures [Abstract]
Fair value of vested shares | $	$ 988	$ 678	$ 44
Aggregate intrinsic value of outstanding awards | $	$ 3,081
Performance period	1 year
Vesting period of awards	3 years
Stock-Settled Appreciation Rights [Member]
Shares or Units and Rights [Roll Forward]
Outstanding, beginning balance (in shares)	57,000	100,875	100,875
Granted/Issued (in shares)	0	0	0
Awards vested or rights exercised (in shares)	0	(43,875)	0
Forfeited (in shares)	0	0	0
Outstanding, ending balance (in shares)	57,000	57,000	100,875
Exercisable, ending balance (in shares)	57,000	57,000	74,875
Weighted-Average Award Price [Roll Forward]
Outstanding, beginning balance (in dollars per share) | $ / shares	$ 18.14	$ 18.14	$ 18.14
Granted/Issued (in dollars per share) | $ / shares	0		0
Awards vested or rights exercised (in dollars per share) | $ / shares	0	18.14	0
Forfeited (in dollars per share) | $ / shares	0		0
Outstanding, ending balance (in dollars per share) | $ / shares	18.14	18.14	18.14
Exercisable, ending balance (in dollars per share) | $ / shares	$ 18.14	$ 18.14	$ 18.14
Additional Disclosures [Abstract]
Aggregate intrinsic value of outstanding awards | $	$ 36
Aggregate intrinsic value of vested awards | $	$ 36
Intrinsic value of awards exercised | $		$ 284

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