Segments (Details) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) Segment	Sep. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)
Segments [Abstract]
Number of reportable segments | Segment				2
Selected financial information for reportable segments [Abstract]
Total assets		$ 2,538,319		$ 2,538,319		$ 2,409,066
Interest income		21,745	$ 20,293	64,366	$ 59,976
Net interest income		19,998	18,841	59,391	55,633
Provision for loan losses		(175)	(244)	(1,439)	(1,037)
Income (loss) before income tax		9,352	7,325	24,458	21,129
Net income (loss)		6,373	5,047	16,911	14,447
Other [Member]
Selected financial information for reportable segments [Abstract]
Total assets	[1]	286,672		286,672		286,936
Interest income	[1]	5	20	22	60
Net interest income	[1]	(291)	(238)	(836)	(699)
Provision for loan losses	[1]	0	0	0	0
Income (loss) before income tax	[1]	(406)	(358)	(1,103)	(1,097)
Net income (loss)	[1]	(256)	(224)	(652)	(693)
Operating Segments [Member] | IB [Member]
Selected financial information for reportable segments [Abstract]
Total assets		2,476,795		2,476,795		2,340,566
Interest income		20,731	18,973	61,190	55,895
Net interest income		19,409	17,964	57,500	52,864
Provision for loan losses		(176)	(238)	(1,436)	(1,032)
Income (loss) before income tax		9,811	7,961	25,971	23,063
Net income (loss)		6,665	5,455	17,834	15,623
Operating Segments [Member] | Mepco [Member]
Selected financial information for reportable segments [Abstract]
Total assets		50,032		50,032		57,208
Interest income		1,014	1,320	3,176	4,081
Net interest income		880	1,115	2,727	3,468
Provision for loan losses		1	(6)	(3)	(5)
Income (loss) before income tax		(29)	(254)	(339)	(766)
Net income (loss)		(20)	(168)	(225)	(437)
Elimination [Member]
Selected financial information for reportable segments [Abstract]
Total assets	[2]	(275,180)		(275,180)		$ (275,644)
Interest income	[2]	(5)	(20)	(22)	(60)
Net interest income	[2]	0	0	0	0
Provision for loan losses	[2]	0	0	0	0
Income (loss) before income tax	[2]	(24)	(24)	(71)	(71)
Net income (loss)	[2]	$ (16)	$ (16)	$ (46)	$ (46)

[1] Includes amounts relating to our parent company.

[2] Includes parent company's investment in subsidiaries and cash balances maintained at subsidiary.