Supplemental Comprehensive Income Disclosures (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Supplemental Comprehensive Income Disclosures [Abstract]
Unrealized holding (losses) gains on securities arising during the period	$ (4,239)	$ 2,068	$ (36,585)	$ 3,165
Non-credit related gains on securities not expected to be sold	236	1,374	4,941	1,549
Reclassification adjustment for gains on securities included in net income	(229)	(163)	(237)	(163)
Total unrealized (losses) gains on securities	(4,232)	3,279	(31,881)	4,551
Total other comprehensive (loss) income	(4,232)	3,279	(31,881)	4,551
Unrealized holding (losses) gains on securities arising during the period	1,487	(722)	12,799	(1,100)
Non-credit related gains on securities not expected to be sold	(82)	(481)	(1,729)	(542)
Reclassification adjustment for gains on securities included in net income	80	57	83	57
Total unrealized (losses) gains on securities	1,485	(1,146)	11,153	(1,585)
Total other comprehensive (loss) income	1,485	(1,146)	11,153	(1,585)
Unrealized holding (losses) gains on securities arising during the period	(2,752)	1,346	(23,786)	2,065
Non-credit related gains on securities not expected to be sold	154	893	3,212	1,007
Reclassification adjustment for gains on securities included in net income	(149)	(106)	(154)	(106)
Total unrealized (losses) gains on securities	(2,747)	2,133	(20,728)	2,966
Total other comprehensive (loss) income	$ (2,747)	$ 2,133	$ (20,728)	$ 2,966