Segments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013 Segment		Mar. 31, 2012		Dec. 31, 2012
Segments [Abstract]
Number of reportable segments	2
Selected financial information for reportable segments [Abstract]
Total assets	$ 2,105,347				$ 2,023,867
Interest income	21,950		25,696
Net interest income	19,556		22,100
Provision for loan losses	(691)		5,131
Income (loss) before income tax	5,842		3,504
Net Income (loss)	5,807		3,504
IB [Member]
Selected financial information for reportable segments [Abstract]
Total assets	1,978,620				1,885,807
Interest income	18,780		21,845
Net interest income	17,616		19,939
Provision for loan losses	(687)		5,103
Income (loss) before income tax	6,819		3,013
Net Income (loss)	7,064		3,542
Mepco [Member]
Selected financial information for reportable segments [Abstract]
Total assets	124,104				135,447
Interest income	3,170		3,851
Net interest income	2,521		2,882
Provision for loan losses	(4)		28
Income (loss) before income tax	823		1,556
Net Income (loss)	543		1,027
Other [Member]
Selected financial information for reportable segments [Abstract]
Total assets	202,914	[1]			192,343	[1]
Interest income	0	[1]	0	[1]
Net interest income	(581)	[1]	(721)	[1]
Provision for loan losses	0	[1]	0	[1]
Income (loss) before income tax	(1,776)	[1]	(1,041)	[1]
Net Income (loss)	(1,776)	[1]	(1,041)	[1]
Elimination [Member]
Selected financial information for reportable segments [Abstract]
Total assets	(200,291)	[2]			(189,730)	[2]
Interest income	0	[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)	$ (24)	[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.