Segments (Details) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($) Segment	Jun. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)
Segments [Abstract]
Number of reportable segments | Segment				2
Selected financial information for reportable segments [Abstract]
Total assets		$ 2,452,696		$ 2,452,696		$ 2,409,066
Interest income		21,267	$ 20,131	42,621	$ 39,683
Net interest income		19,630	18,701	39,393	36,792
Provision for loan losses		(734)	(134)	(1,264)	(793)
Income (loss) before income tax		9,049	8,243	15,106	13,804
Net income (loss)		6,438	5,619	10,538	9,400
Other [Member]
Selected financial information for reportable segments [Abstract]
Total assets	[1]	282,570		282,570		286,936
Interest income	[1]	12	20	17	40
Net interest income	[1]	(274)	(234)	(545)	(461)
Provision for loan losses	[1]	0	0	0	0
Income (loss) before income tax	[1]	(274)	(356)	(697)	(739)
Net income (loss)	[1]	(129)	(225)	(396)	(469)
Operating Segments [Member] | IB [Member]
Selected financial information for reportable segments [Abstract]
Total assets		2,391,120		2,391,120		2,340,566
Interest income		20,216	18,701	40,459	36,922
Net interest income		18,989	17,717	38,091	34,900
Provision for loan losses		(734)	(138)	(1,260)	(794)
Income (loss) before income tax		9,298	8,843	16,160	15,102
Net income (loss)		6,550	5,935	11,169	10,168
Operating Segments [Member] | Mepco [Member]
Selected financial information for reportable segments [Abstract]
Total assets		50,178		50,178		57,208
Interest income		1,052	1,430	2,162	2,761
Net interest income		915	1,218	1,847	2,353
Provision for loan losses		0	4	(4)	1
Income (loss) before income tax		49	(221)	(310)	(512)
Net income (loss)		32	(77)	(205)	(269)
Elimination [Member]
Selected financial information for reportable segments [Abstract]
Total assets	[2]	(271,172)		(271,172)		$ (275,644)
Interest income	[2]	(13)	(20)	(17)	(40)
Net interest income	[2]	0	0	0	0
Provision for loan losses	[2]	0	0	0	0
Income (loss) before income tax	[2]	(24)	(23)	(47)	(47)
Net income (loss)	[2]	$ (15)	$ (14)	$ (30)	$ (30)

[1] Includes amounts relating to our parent company.

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