Segment Reporting - Key Operating Results of Business Segments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Segment Reporting Information [Line Items]
Interest income	$ 12,384	$ 9,524	$ 33,990	$ 28,878
Interest expense	1,237	886	3,277	2,560
Net interest income	11,147	8,638	30,713	26,318
Provision for loan losses	0	445	235	1,753	2,395
Noninterest income	6,737	5,088	18,704	14,831
Noninterest expense	13,095	10,938	39,512	32,359
Income (loss) before taxes on income	4,789	2,343	9,670	7,037
Operating Segments | Banking
Segment Reporting Information [Line Items]
Interest income	12,384	9,524	33,990	28,878
Interest expense	1,014	807	2,753	2,417
Net interest income	11,370	8,717	31,237	26,461
Provision for loan losses	0	445	235	1,753
Noninterest income	1,765	953	4,694	2,829
Noninterest expense	8,216	6,048	22,773	17,922
Income (loss) before taxes on income	4,919	3,177	12,923	9,615
Operating Segments | Wealth Management
Segment Reporting Information [Line Items]
Provision for loan losses	0	0	0	0
Noninterest income	5,113	4,233	14,400	12,292
Noninterest expense	4,351	4,408	13,576	13,017
Income (loss) before taxes on income	762	(175)	824	(725)
Corporate Joint And Intersegment Elimination
Segment Reporting Information [Line Items]
Interest expense	223	79	524	143
Net interest income	(223)	(79)	(524)	(143)
Provision for loan losses	0	0	0	0
Noninterest income	(141)	(98)	(390)	(290)
Noninterest expense	528	482	3,163	1,420
Income (loss) before taxes on income	$ (892)	$ (659)	$ (4,077)	$ (1,853)