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Consolidated Statements of Changes In Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Unearned Employee Stock Ownership Plan Shares	Accumulated Other Comprehensive Income (Loss)
Beginning Balance at Dec. 31, 2016	$ 204,780	$ 192	$ 173,047	$ 39,483	$ (8,318)	$ 376
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	4,453			4,453
Other comprehensive loss, net of tax	(52)					(52)
Net exercise of stock options (192,215 shares)	(1,237)	2	(1,239)
Prepayment of ESOP Share Acquisition Loan	1,125	(8)	(7,185)		8,318
Repurchase and retirement of common stock (81,500 and 232,045 shares for quarters ended March 31, 2017 and 2016, respectively)	(6,567)	(4)	(6,563)
Cash dividends declared on common stock ($0.08 and $0.06 per share for quarters ended March 31, 2017 and 2016, respectively)	(2,440)			(2,440)
Ending Balance at Jun. 30, 2017	200,062	182	158,060	41,496	0	324
Beginning Balance at Dec. 31, 2017	197,634	179	153,811	43,274	0	370
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	8,189			8,189
Other comprehensive loss, net of tax	(91)					(91)
Nonvested stock awards-stock-based compensation expense	6		6
Repurchase and retirement of common stock (81,500 and 232,045 shares for quarters ended March 31, 2017 and 2016, respectively)	(8,490)	(4)	(8,486)
Cash dividends declared on common stock ($0.08 and $0.06 per share for quarters ended March 31, 2017 and 2016, respectively)	(3,020)			(3,020)
Ending Balance at Jun. 30, 2018	$ 194,228	$ 175	$ 145,331	$ 48,443	$ 0	$ 279

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