Equity Compensation (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Equity Compensation
Unrecognized compensation expense	$ 500		$ 500		$ 500
Compensation Expense	598	$ 504	1,659	$ 2,372	2,976	$ 2,875
Tax Benefit Recognized	$ 213	$ 180	$ 592	$ 870	$ 1,081	$ 1,050
Time-Vested Restricted Stock Awards
Assumptions used for estimating fair value of grants outstanding
Vesting period			3 years
Period from date of termination of employment due to death, retirement or disability during which the pro-rata portion of the awards are distributed			6 months
Changes in restricted stock awards
Nonvested, balance at the beginning of the period (in shares)			41,000	24,900	41,000
Granted (in shares)			19,000	22,600
Distributed (in shares)			(1,654)	(4,010)
Forfeited shares (in shares)			(2,746)	(2,490)
Nonvested, balance at the end of the period (in shares)	55,600	41,000	55,600	41,000	55,600	41,000
Weighted Average Grant Date Fair Value
Nonvested, balance at the beginning of the period (in dollars per share)			$ 21.89	$ 22.68	$ 24.15
Granted (in dollars per share)			30.40	22.40
Distributed (in dollars per share)			21.92	22.98
Forfeited shares ( in dollars per share)			25.91
Nonvested, balance at the end of the period (in dollars per share)	$ 24.60	$ 24.15	$ 24.60	$ 24.15	$ 24.60	$ 24.15
Performance-Based Restricted Stock Awards
Changes in restricted stock awards
Nonvested, balance at the beginning of the period (in shares)			63,300	47,200	63,300
Target shares granted (in shares)			21,800	27,000
Shares issued in excess of target (in shares)			3,653
Shares awarded (in shares)			(13,653)
Forfeited shares (in shares)			(6,079)
Target shares not awarded (in shares)			0	(10,900)
Nonvested, balance at the end of the period (in shares)	69,021	63,300	69,021	63,300	69,021	63,300
Weighted Average Grant Date Fair Value
Nonvested, balance at the beginning of the period (in dollars per share)			$ 21.74	$ 21.39	$ 21.74
Target shares granted (in dollars per share)			$ 30.40	22.40
Shares issued in excess of target (in dollars per share)			30.55
Shares awarded (in dollars per share)			$ 30.55
Forfeited shares ( in dollars per share)			24.10
Target shares not awarded (in dollars per share)			0.00	21.84
Nonvested, balance at the end of the period (in dollars per share)	$ 24.36	$ 21.74	$ 24.36	$ 21.74	$ 24.36	$ 21.74