Segment Reporting (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
Segment Reporting Information [Line Items]
Interest income	$ 18,995	$ 19,219	$ 18,725	$ 18,946	$ 19,172	$ 19,457	$ 19,461	$ 19,489	$ 75,885	$ 77,579	$ 80,654
Interest expense	1,039	978	981	998	1,080	1,138	1,353	1,546	3,996	5,117	8,174
Net interest income	17,956	18,241	17,744	17,948	18,092	18,319	18,108	17,943	71,889	72,462	72,480
Provision for loan and lease losses	648	233	1,251	1,475	1,614	4,094	3,446	2,074	3,607	11,228	10,035
Noninterest income	12,076	12,510	11,924	12,141	11,116	13,202	10,991	11,475	48,651	46,784	40,260
Total noninterest expense	22,562	22,019	21,790	20,883	21,623	19,988	19,286	20,236	87,254	81,133	76,282
Income before income taxes	6,822	8,499	6,627	7,731	5,971	7,439	6,367	7,108	29,679	26,885	26,423
Income taxes	1,632	2,264	1,547	2,005	1,049	1,400	1,537	1,710	7,448	5,696	5,551
Net income	5,190	6,235	5,080	5,726	4,922	6,039	4,830	5,398	22,231	21,189	20,872
Total assets	2,235,321				2,191,559				2,235,321	2,191,559
Capital expenditures									3,686	3,430	3,230
Banking [Member]
Segment Reporting Information [Line Items]
Interest income									75,850	77,517	80,568
Interest expense									3,998	4,641	6,983
Net interest income									71,852	72,876	73,585
Provision for loan and lease losses									3,607	11,228	10,035
Noninterest income									16,170	22,053	18,018
Total noninterest expense									63,120	60,759	57,917
Income before income taxes									21,295	22,942	23,651
Income taxes									4,043	4,255	4,318
Net income									17,252	18,687	19,333
Total assets	2,154,485				2,129,314				2,154,485	2,129,314
Capital expenditures									2,824	2,679	2,950
Wealth Management [Member]
Segment Reporting Information [Line Items]
Interest income									1	1	3
Interest expense									0	0	0
Net interest income									1	1	3
Provision for loan and lease losses									0	0	0
Noninterest income									19,918	14,938	12,906
Total noninterest expense									13,855	10,079	9,626
Income before income taxes									6,064	4,860	3,283
Income taxes									2,269	1,850	1,266
Net income									3,795	3,010	2,017
Total assets	34,195				22,737				34,195	22,737
Capital expenditures									100	13	53
Insurance [Member]
Segment Reporting Information [Line Items]
Interest income									0	0	3
Interest expense									0	0	0
Net interest income									0	0	3
Provision for loan and lease losses									0	0	0
Noninterest income									12,038	9,959	8,079
Total noninterest expense									11,435	8,749	7,782
Income before income taxes									603	1,210	300
Income taxes									256	497	113
Net income									347	713	187
Total assets	22,930				19,524				22,930	19,524
Capital expenditures									593	46	37
Other Segments [Member]
Segment Reporting Information [Line Items]
Interest income									34	61	80
Interest expense									(2)	476	1,191
Net interest income									36	(415)	(1,111)
Provision for loan and lease losses									0	0	0
Noninterest income									525	(166)	1,257
Total noninterest expense									(1,156)	1,546	957
Income before income taxes									1,717	(2,127)	(811)
Income taxes									880	(906)	(146)
Net income									837	(1,221)	(665)
Total assets	23,711				19,984				23,711	19,984
Capital expenditures									$ 169	$ 692	$ 190