Parent Company Financial Statements (Statements of Income) (Details) - USD ($) $ in Thousands	3 Months Ended										12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	[1]	Dec. 31, 2015	[2]	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Condensed Financial Statements, Captions [Line Items]
Interest on borrowings											$ 4,506	$ 3,457	$ 3,329
Salaries and employee benefits											48,072	37,220	32,669
Furniture, equipment and data processing											9,557	8,057	7,316
Net occupancy costs											7,088	5,695	5,055
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 benefit	(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
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Dividend income from subsidiaries											16,000	39,200	12,800
Other income (loss)											239	(18)	104
Total operating income											16,239	39,182	12,904
Interest on borrowings											3,415	2,734	2,532
Fees to Bank											160	160	160
Other operating expenses											748	469	453
Total operating expenses											4,323	3,363	3,145
Income before equity in undistributed earnings of subsidiaries and income taxes											11,916	35,819	9,759
Equity in undistributed income (losses) of subsidiaries											26,773	(15,999)	13,799
Income before income tax expense											38,689	19,820	23,558
Income tax benefit											1,378	1,132	1,012
Net income											$ 40,067	$ 20,952	$ 24,570

[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