Parent Company Financial Information STATEMENTS OF OPERATIONS (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income:
Interest income	$ 31,911	$ 29,747	$ 30,071	$ 26,626	$ 22,536	$ 21,333	$ 19,314	$ 18,156	$ 118,356	$ 81,339	$ 63,800
Noninterest income	4,217	4,378	4,380	1,470	4,903	4,168	2,388	1,918	14,441	13,377	8,811
Expense:
Interest expense	3,074	3,051	2,978	2,952	2,770	2,014	1,533	1,387	12,057	7,704	5,356
Noninterest expense	18,539	17,374	17,214	20,469	16,468	13,343	11,641	13,541	73,591	54,993	50,815
INCOME BEFORE INCOME TAX									40,724	27,335	14,580
INCOME TAX	4,750	4,801	4,601	1,056	2,889	3,410	2,855	1,565	15,209	10,719	5,587
NET INCOME	$ 8,065	$ 7,837	$ 7,825	$ 1,789	$ 3,891	$ 5,450	$ 4,643	$ 2,632	25,515	16,616	8,993
Corporation
Income:
Interest income									27	36	20
Noninterest income									0	2	3
Total income									27	38	23
Expense:
Interest expense									3,937	1,543	307
Noninterest expense									2,831	1,874	2,141
Total expense									6,768	3,417	2,448
INCOME BEFORE INCOME TAX									(6,741)	(3,379)	(2,425)
INCOME TAX									(2,783)	(1,275)	(827)
Net loss (parent only)									(3,958)	(2,104)	(1,598)
Equity in net earnings of subsidiaries									29,473	18,720	10,591
NET INCOME									$ 25,515	$ 16,616	$ 8,993