Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock and Related Surplus [Member]	Unearned ESOP Shares [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]	Series 2009 Preferred Stock [Member]	Series 2009 Preferred Stock [Member] Common Stock and Related Surplus [Member]	Series 2009 Preferred Stock [Member] Preferred Stock [Member]	Series 2011 Preferred Stock [Member]	Series 2011 Preferred Stock [Member] Common Stock and Related Surplus [Member]	Series 2011 Preferred Stock [Member] Preferred Stock [Member]
Beginning Balance at Dec. 31, 2014	$ 131,644	$ 32,670	$ 0	$ 87,719	$ 2,072			$ 3,419			$ 5,764
Comprehensive income:
Net income	16,102			16,102
Other comprehensive income	(2,528)				(2,528)
Exercise of stock options	51	51
Stock compensation expense	151	151
Conversion of Preferred Stock to Common Stock						$ (15)	$ 3,404	(3,419)	$ (17)	$ 5,747	(5,764)
Issuance of shares of common stock	4,705	4,705
Purchase of unallocated common stock held by ESOP	(2,250)		(2,250)
Stock Issued During Period, Value, Employee Stock Ownership Plan	312	26	286
Stock Repurchased and Retired During Period, Value	(1,080)	(1,080)
Stock Issued During Period, Value, Dividend Reinvestment Plan	67	67
Dividends, Common Stock, Cash	(3,398)			(3,398)
Ending Balance at Dec. 31, 2015	143,744	45,741	(1,964)	100,423	(456)			0			0
Comprehensive income:
Net income	17,297			17,297
Other comprehensive income	(2,806)				(2,806)
Exercise of stock options	447	447
Stock compensation expense	200	200
Stock Issued During Period, Value, Employee Stock Ownership Plan	649	268	381
Stock Issued During Period, Value, Dividend Reinvestment Plan	101	101
Dividends, Common Stock, Cash	(4,272)			(4,272)
Ending Balance at Dec. 31, 2016	155,360	46,757	(1,583)	113,448	(3,262)			0			0
Comprehensive income:
Net income	11,915			11,915
Other comprehensive income	4,696				4,696
TaxCutsandJobsActof2017ReclassificationfromAOCItoRetainedEarnings	0			(298)	298
Exercise of stock options	304	304
Stock compensation expense	385	385
Stock Issued During Period, Value, Employee Stock Ownership Plan	946	515	431
Stock Issued During Period, Value, Acquisitions	32,968	32,968
Stock Issued During Period, Value, Dividend Reinvestment Plan	169	169
Dividends, Common Stock, Cash	(5,238)			(5,238)
Ending Balance at Dec. 31, 2017	$ 201,505	$ 81,098	$ (1,152)	$ 119,827	$ 1,732			$ 0			$ 0