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Employee Benefit Plans, Restricted Stock Plan (Details) - Restricted Stock [Member] - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Deferred Compensation Arrangements [Abstract]
Number of shares authorized (in shares)	150,000		150,000
Number of shares available for grant (in shares)	130,452		130,452
Unvested Shares [Roll Forward]
Outstanding, beginning of period (in shares)	9,714		9,764
Granted (in shares)	5,130		5,130
Forfeited (in shares)	(152)		(152)
Vested (in shares)	(3,928)		(3,978)
Outstanding, end of period (in shares)	10,764		10,764
Weighted Average Market Price [Roll Forward]
Outstanding, beginning of period (in dollars per share)	$ 57.17		$ 58.21
Granted (in dollars per share)	60.21		60.21
Forfeited (in dollars per share)	60.00		60.00
Vested (in dollars per share)	(55.51)		(55.46)
Outstanding, end of period (in dollars per share)	$ 60.16		$ 60.16
Additional General Disclosures [Abstract]
Share-based compensation expense	$ 74	$ 63	$ 141	$ 119
Compensation cost related to nonvested awards that has not yet been recognized	$ 648		$ 648
Period over which compensation cost is expected to be recognized			3 years

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