Stock-Based Compensation (Details) $ / shares in Units, $ in Thousands			3 Months Ended		9 Months Ended
	Aug. 19, 2019 Officer	Nov. 20, 2018 Officer	Sep. 30, 2019 USD ($) $ / shares shares	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) $ / shares shares	Sep. 30, 2018 USD ($)	May 02, 2016 shares
Officer Retiring in 2019 [Member]
Stock-Based Compensation [Abstract]
Number of retiring officers receiving accelerated vesting period | Officer		1
Officer Retiring in 2020 [Member]
Stock-Based Compensation [Abstract]
Number of retiring officers receiving accelerated vesting period | Officer	1
LTIP [Member]
Stock-Based Compensation [Abstract]
Maximum number of shares of common stock that can be issued under the plan (in shares)							100,000
Term of plan					10 years
Maximum number of shares of common stock subject to awards that may be granted to a participant per calendar year (in shares)					2,000
LTIP [Member] | Restricted Stock [Member]
Number of Shares [Roll Forward]
Nonvested at beginning of the period (in shares)					3,080
Granted (in shares)					6,963
Vested (in shares)					(2,556)
Forfeited (in shares)					0
Nonvested at end of the period (in shares)			7,487		7,487
Grant Date Weighted Average Fair Value [Abstract]
Nonvested at beginning of the period (in dollars per share) | $ / shares					$ 33.85
Granted (in dollars per share) | $ / shares					33.61
Vested (in dollars per share) | $ / shares					33.80
Forfeited (in dollars per share) | $ / shares					0
Nonvested at end of the period (in dollars per share) | $ / shares			$ 33.64		$ 33.64
Stock-Based Compensation Expense [Abstract]
Stock-based compensation expense | $			$ 40	$ 11	$ 119	$ 68
Recognized tax benefits related to stock-based compensation expense | $			12	$ 3	35	$ 19
Fair value of vested shares | $					86
Stock-based compensation expense not yet recognized | $			$ 252		$ 252
Period of recognition					3 years
LTIP [Member] | Restricted Stock [Member] | Officer Retiring in 2019 [Member]
Stock-Based Compensation [Abstract]
Vesting period					3 years
LTIP [Member] | Restricted Stock [Member] | Officer Retiring in 2020 [Member]
Stock-Based Compensation [Abstract]
Vesting period					3 years