Segments (Details) $ in Thousands		3 Months Ended
		Mar. 31, 2016 USD ($) Segment	Mar. 31, 2015 USD ($)	Dec. 31, 2015 USD ($)
Segments [Abstract]
Number of reportable segments | Segment		2
Selected financial information for reportable segments [Abstract]
Total assets		$ 2,487,120		$ 2,409,066
Interest income		21,354	$ 19,552
Net interest income		19,763	18,091
Provision for loan losses		(530)	(659)
Income (loss) before income tax		6,057	5,561
Net income (loss)		4,100	3,781
Other [Member]
Selected financial information for reportable segments [Abstract]
Total assets	[1]	275,315		286,936
Interest income	[1]	5	20
Net interest income	[1]	(271)	(227)
Provision for loan losses	[1]	0	0
Income (loss) before income tax	[1]	(423)	(383)
Net income (loss)	[1]	(267)	(244)
Operating Segments [Member] | IB [Member]
Selected financial information for reportable segments [Abstract]
Total assets		2,425,152		2,340,566
Interest income		20,243	18,221
Net interest income		19,102	17,183
Provision for loan losses		(526)	(656)
Income (loss) before income tax		6,862	6,259
Net income (loss)		4,619	4,233
Operating Segments [Member] | Mepco [Member]
Selected financial information for reportable segments [Abstract]
Total assets		50,515		57,208
Interest income		1,110	1,331
Net interest income		932	1,135
Provision for loan losses		(4)	(3)
Income (loss) before income tax		(359)	(291)
Net income (loss)		(237)	(192)
Elimination [Member]
Selected financial information for reportable segments [Abstract]
Total assets	[2]	(263,862)		$ (275,644)
Interest income	[2]	(4)	(20)
Net interest income	[2]	0	0
Provision for loan losses	[2]	0	0
Income (loss) before income tax	[2]	(23)	(24)
Net income (loss)	[2]	$ (15)	$ (16)

[1] Includes amounts relating to our parent company.

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