Parent Company Financial Statements (Statements of Income) (Details) - USD ($) $ in Thousands	3 Months Ended									12 Months Ended
	Dec. 31, 2015	[1]	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
Condensed Financial Statements, Captions [Line Items]
Interest on borrowings										$ 3,457	$ 3,329	$ 3,137
Salaries and employee benefits										37,220	32,669	32,609
Furniture, equipment and data processing										8,057	7,316	7,051
Net occupancy										5,695	5,055	5,449
Income before income tax	$ 2,408		$ 9,583	$ 10,534	$ 8,334	$ 8,611	$ 9,605	$ 9,317	$ 8,477	30,859	36,010	34,915
Income tax benefit	(716)		(3,127)	(3,341)	(2,723)	(2,523)	(3,154)	(3,001)	(2,762)	(9,907)	(11,440)	(12,132)
Net income	$ 1,692		$ 6,456	$ 7,193	$ 5,611	$ 6,088	$ 6,451	$ 6,316	$ 5,715	20,952	24,570	22,783
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Dividend income from subsidiaries										39,200	12,800	13,500
Fees from subsidiaries										0	0	20,930
Other income (loss)										(18)	104	270
Total operating income										39,182	12,904	34,700
Interest on borrowings										2,734	2,532	2,532
Fees to Bank										160	160	0
Salaries and employee benefits										0	0	13,354
Furniture, equipment and data processing										0	0	4,570
Depreciation and amortization										0	0	1,197
Compensation expense										0	0	596
Net occupancy										0	0	523
Other operating expenses										469	453	1,454
Total operating expenses										3,363	3,145	24,226
Income before equity in undistributed earnings of subsidiaries and income taxes										35,819	9,759	10,474
Equity in undistributed income (losses) of subsidiaries										(15,999)	13,799	11,233
Income before income tax										19,820	23,558	21,707
Income tax benefit										1,132	1,012	1,076
Net income										$ 20,952	$ 24,570	$ 22,783

[1] 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 2.7 million shares of Company common stock in connection with the acquisition. Refer to Note 2 and 3 for additional details of the acquisition