Fair Value (Details 3) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended		9 Months Ended		12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Jun. 30, 2013	Jun. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2013	Dec. 31, 2012
Losses recognized in earnings for trust preferred securities held
Beginning balance	$ 351	$ 261	$ 351	$ 261	$ 351	$ 261	$ 351	$ 261
Additional credit losses on debt securities for which other-than-temporary impairment was previously recognized		90					1,954
Ending balance							2,305	351
PreTSL XXIII Class C-FP
Losses recognized in earnings for trust preferred securities held
Moody’s/Fitch Rating							Ca/C	C/C
Beginning balance	211	211	211	211	211	211	211	211
Additional credit losses on debt securities for which other-than-temporary impairment was previously recognized
Ending balance							211	211
I-PreTSL I
Losses recognized in earnings for trust preferred securities held
Moody’s/Fitch Rating							NR/CCC	NR/CCC
Additional credit losses on debt securities for which other-than-temporary impairment was previously recognized							216
Ending balance							216
I-PreTSL I
Losses recognized in earnings for trust preferred securities held
Moody’s/Fitch Rating							NR/CCC	NR/CCC
Additional credit losses on debt securities for which other-than-temporary impairment was previously recognized							230
Ending balance							230
I-PreTSL I
Losses recognized in earnings for trust preferred securities held
Moody’s/Fitch Rating							NR/CCC	NR/CCC
Additional credit losses on debt securities for which other-than-temporary impairment was previously recognized							230
Ending balance							230
I-PreTSL II
Losses recognized in earnings for trust preferred securities held
Moody’s/Fitch Rating							NR/B	NR/B
Additional credit losses on debt securities for which other-than-temporary impairment was previously recognized							291
Ending balance							291
I-PreTSL III
Losses recognized in earnings for trust preferred securities held
Moody’s/Fitch Rating							Ba3/CCC	Ba3/CCC
Additional credit losses on debt securities for which other-than-temporary impairment was previously recognized							130
Ending balance							130
I-PreTSL III
Losses recognized in earnings for trust preferred securities held
Moody’s/Fitch Rating							NR/CCC	NR/CCC
Additional credit losses on debt securities for which other-than-temporary impairment was previously recognized							380
Ending balance							380
I-PreTSL IV
Losses recognized in earnings for trust preferred securities held
Moody’s/Fitch Rating							Ba2/B	Ba2/CCC
Additional credit losses on debt securities for which other-than-temporary impairment was previously recognized							140
Ending balance							140
I-PreTSL IV
Losses recognized in earnings for trust preferred securities held
Moody’s/Fitch Rating							Ba2/B	Ba2/CCC
Additional credit losses on debt securities for which other-than-temporary impairment was previously recognized							140
Ending balance							140
I-PreTSL IV
Losses recognized in earnings for trust preferred securities held
Moody’s/Fitch Rating							Caa1/CCC	Caa1/CC
Additional credit losses on debt securities for which other-than-temporary impairment was previously recognized							197
Ending balance							197
Trapeza IX
Losses recognized in earnings for trust preferred securities held
Moody’s/Fitch Rating							Ca/CC	Ca/CC
Beginning balance	140	50	140	50	140	50	140	50
Additional credit losses on debt securities for which other-than-temporary impairment was previously recognized		90
Ending balance							$ 140	$ 140