Segments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015 Segment		Mar. 31, 2014		Dec. 31, 2014
Segments [Abstract]
Number of reportable segments	2
Selected financial information for reportable segments [Abstract]
Total assets	$ 2,329,296				$ 2,248,730
Interest income	19,552		20,283
Net interest income	18,091		18,478
Provision for loan losses	(659)		428
Income (loss) before income tax	5,561		4,605
Net income (loss)	3,781		3,138
Other [Member]
Selected financial information for reportable segments [Abstract]
Total assets	289,132	[1]			286,158	[1]
Interest income	20	[1]	0	[1]
Net interest income	(227)	[1]	(287)	[1]
Provision for loan losses	0	[1]	0	[1]
Income (loss) before income tax	(383)	[1]	(405)	[1]
Net income (loss)	(244)	[1]	(263)	[1]
Operating Segments [Member] | IB [Member]
Selected financial information for reportable segments [Abstract]
Total assets	2,256,469				2,174,536
Interest income	18,221		18,198
Net interest income	17,183		17,083
Provision for loan losses	(656)		443
Income (loss) before income tax	6,259		4,678
Net income (loss)	4,233		3,182
Operating Segments [Member] | Mepco [Member]
Selected financial information for reportable segments [Abstract]
Total assets	61,891				63,378
Interest income	1,331		2,085
Net interest income	1,135		1,682
Provision for loan losses	(3)		(15)
Income (loss) before income tax	(291)		356
Net income (loss)	(192)		243
Elimination [Member]
Selected financial information for reportable segments [Abstract]
Total assets	(278,196)	[2]			(275,342)	[2]
Interest income	(20)	[2]	0	[2]
Net interest income	0	[2]	0	[2]
Provision for loan losses	0	[2]	0	[2]
Income (loss) before income tax	(24)	[2]	(24)	[2]
Net income (loss)	$ (16)	[2]	$ (24)	[2]

[1] Includes amounts relating to our parent company and certain insignificant operations.

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