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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock	Preferred Stock	Paid-in Capital	Retained Earnings (Accumulated Deficit)	Accumulated Other Comprehensive Income (Loss)	Total
Balance at Jun. 30, 2017	$ 4	$ 0	$ 123,840	$ 82,750	$ (55,437)	$ 151,157
Balance (in shares) at Jun. 30, 2017	39,875,968
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss)				15,892	2,929	18,821
Exercise of stock options			3,486			3,486
Exercise of stock options (in shares)	294,707
Dividends declared				(3,989)		(3,989)
Balance at Sep. 30, 2017	$ 4	0	127,326	94,653	(52,508)	169,475
Balance (in shares) at Sep. 30, 2017	40,170,675
Balance at Jun. 30, 2017	$ 4	0	123,840	82,750	(55,437)	151,157
Balance (in shares) at Jun. 30, 2017	39,875,968
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss)						41,133
Balance at Mar. 31, 2018	$ 4	0	129,132	113,477	(57,068)	185,545
Balance (in shares) at Mar. 31, 2018	40,323,298
Balance at Sep. 30, 2017	$ 4	0	127,326	94,653	(52,508)	169,475
Balance (in shares) at Sep. 30, 2017	40,170,675
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss)				7,032	(4,377)	2,655
Exercise of stock options			214			214
Exercise of stock options (in shares)	18,050
Dividends declared				(4,019)		(4,019)
Balance at Dec. 31, 2017	$ 4	0	127,540	97,666	(56,885)	168,325
Balance (in shares) at Dec. 31, 2017	40,188,725
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss)				19,840	(183)	19,657
Exercise of stock options			1,592			1,592
Exercise of stock options (in shares)	134,573
Dividends declared				(4,029)		(4,029)
Balance at Mar. 31, 2018	$ 4	0	129,132	113,477	(57,068)	185,545
Balance (in shares) at Mar. 31, 2018	40,323,298
Balance at Jun. 30, 2018	$ 4	0	129,873	131,560	(76,483)	184,954
Balance (in shares) at Jun. 30, 2018	40,357,708
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss)				16,314	(7,195)	9,119
Exercise of stock options			211			211
Exercise of stock options (in shares)	17,860
Dividends declared				(4,037)		(4,037)
Adoption of new revenue standard				1,245		1,245
Stock-based compensation expense			565			565
Balance at Sep. 30, 2018	$ 4	0	130,649	145,082	(83,678)	192,057
Balance (in shares) at Sep. 30, 2018	40,375,568
Balance at Jun. 30, 2018	$ 4	0	129,873	131,560	(76,483)	184,954
Balance (in shares) at Jun. 30, 2018	40,357,708
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss)						38,430
Balance at Mar. 31, 2019	$ 4	0	132,701	164,978	(83,964)	213,719
Balance (in shares) at Mar. 31, 2019	40,453,608
Balance at Sep. 30, 2018	$ 4	0	130,649	145,082	(83,678)	192,057
Balance (in shares) at Sep. 30, 2018	40,375,568
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss)				14,748	2,571	17,319
Exercise of stock options			130			130
Exercise of stock options (in shares)	11,000
Dividends declared				(4,846)		(4,846)
Stock-based compensation expense			564			564
Balance at Dec. 31, 2018	$ 4	0	131,343	154,984	(81,107)	205,224
Balance (in shares) at Dec. 31, 2018	40,386,568
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss)				14,849	(2,857)	11,992
Exercise of stock options			793			793
Exercise of stock options (in shares)	67,040
Dividends declared				(4,855)		(4,855)
Stock-based compensation expense			565			565
Balance at Mar. 31, 2019	$ 4	$ 0	$ 132,701	$ 164,978	$ (83,964)	$ 213,719
Balance (in shares) at Mar. 31, 2019	40,453,608

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