Quarterly Results of Operations (Unaudited) (Details) $ / shares in Units, $ in Thousands	3 Months Ended																9 Months Ended	12 Months Ended
	Dec. 31, 2016 USD ($) $ / shares		Sep. 30, 2016 USD ($) $ / shares		Jun. 30, 2016 USD ($) $ / shares		Mar. 31, 2016 USD ($) $ / shares	[1]	Dec. 31, 2015 USD ($) $ / shares	[2]	Sep. 30, 2015 USD ($) $ / shares		Jun. 30, 2015 USD ($) $ / shares		Mar. 31, 2015 USD ($) $ / shares		Sep. 30, 2016	Dec. 31, 2016 USD ($) $ / shares shares		Dec. 31, 2015 USD ($) $ / shares		Dec. 31, 2014 USD ($) $ / shares shares
Effect of Fourth Quarter Events [Line Items]
Stockholders' Equity Note, Stock Split, Conversion Ratio																	1.5	1.5
Interest income	$ 32,276		$ 32,594		$ 32,775		$ 31,981		$ 29,983		$ 23,056		$ 23,657		$ 22,448			$ 129,626		$ 99,144		$ 88,385
Interest expense	4,032		4,222		4,271		4,029		3,612		3,044		3,022		3,014			16,554		12,692		12,128
Net interest income	28,244		28,372		28,504		27,952		26,371		20,012		20,635		19,434			113,072		86,452		76,257
Provision for credit losses	255		1,279		2,852		872		957		279		254		446			5,258		1,936		2,220
Non-interest income	10,151		11,001		10,552		7,917		8,464		6,561		6,310		6,147			39,621		27,482		24,370
Non-interest expense	22,508		22,149		22,330		22,909		31,470		16,711		16,157		16,801			89,896		81,139		62,397
Income before income tax expense	15,632		15,945		13,874		12,088		2,408		9,583		10,534		8,334			57,539		30,859		36,010
Income tax expense	4,730		5,042		4,258		3,442		716		3,127		3,341		2,723			17,472		9,907		11,440
Net income	$ 10,902		$ 10,903		$ 9,616		$ 8,646		$ 1,692		$ 6,456		$ 7,193		$ 5,611			$ 40,067		$ 20,952		$ 24,570
Per common share:
Basic earnings per share | $ / shares	$ 0.70	[1],[2],[3]	$ 0.70	[1],[2],[3]	$ 0.62	[1],[2],[3]	$ 0.56	[2],[3]	$ 0.11	[1],[3]	$ 0.58	[1],[2],[3]	$ 0.64	[1],[2],[3]	$ 0.50	[1],[2],[3]		$ 2.59	[4]	$ 1.73	[4]	$ 2.19	[4]
Diluted earnings per share | $ / shares	$ 0.70	[1],[2],[3]	$ 0.70	[1],[2],[3]	$ 0.62	[1],[2],[3]	$ 0.56	[2],[3]	$ 0.11	[1],[3]	$ 0.57	[1],[2],[3]	$ 0.64	[1],[2],[3]	$ 0.50	[1],[2],[3]		$ 2.57	[4]	$ 1.73	[4]	$ 2.19	[4]
Common Stock [Member]
Effect of Fourth Quarter Events [Line Items]
Stock Issued During Period, Shares, Acquisitions | shares																		4,100,000				4,124,643

[1] (1)In the second quarter of 2016, the Company adopted ASU 2016-09 effective as of January 1, 2016. As such, first quarter 2016 financial results have been restated from previously reported within Form 10-Q.

[2] On October 16, 2015, the Company completed its acquisition of SBM. Fourth quarter 2015 results of operations include revenues and expenses incurred as a combined organization from the acquisition date through December 31, 2015. The decrease in basic and diluted EPS in the fourth quarter of 2015 was due to acquisition costs and the issuance of 4.1 million shares of Company common stock (as adjusted for the three-for-two common stock split effective September 30, 2016) in connection with the acquisition. Refer to Note 2 for additional details of the acquisition

[3] (3)Earnings per share amounts have been adjusted to reflect the three-for-two split effective September 30, 2016, for all periods presented. Refer to Note 13.

[4] (2)Share and per share amounts have been adjusted to reflect the three-for-two split effective September 30, 2016, for all periods presented. Refer to Note 13.