Parent Company Financial Statements (Statements of Income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Condensed Financial Statements, Captions [Line Items]
Interest on borrowings									$ 3,329	$ 3,137	$ 5,363
Salaries and employee benefits									32,669	32,609	29,689
Furniture, equipment and data processing									7,316	7,051	5,079
Net occupancy									5,055	5,449	4,365
Income before income tax	8,611	9,605	9,317	8,477	7,984	9,318	9,283	8,330	36,010	34,915	34,310
Income tax benefit	(2,523)	(3,154)	(3,001)	(2,762)	(3,560)	(2,952)	(2,952)	(2,668)	(11,440)	(12,132)	(10,882)
Net income	6,088	6,451	6,316	5,715	4,424	6,366	6,331	5,662	24,570	22,783	23,428
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Dividend income from subsidiaries									12,800	13,500	13,400
Fees from subsidiaries									0	20,930	20,070
Other income									104	270	170
Total operating income									12,904	34,700	33,640
Interest on borrowings									2,532	2,532	2,546
Fees to Bank									160	0	0
Salaries and employee benefits									0	13,354	13,007
Furniture, equipment and data processing									0	4,570	3,971
Depreciation and amortization									0	1,197	1,196
Compensation expense									0	596	538
Net occupancy									0	523	492
Other operating expenses									453	1,454	1,056
Total operating expenses									3,145	24,226	22,806
Income before equity in undistributed earnings of subsidiaries and income taxes									9,759	10,474	10,834
Equity in undistributed earnings of subsidiaries									13,799	11,233	11,647
Income before income tax									23,558	21,707	22,481
Income tax benefit									1,012	1,076	947
Net income									$ 24,570	$ 22,783	$ 23,428