Supplemental Comprehensive Income Disclosures (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Unrealized gains on securities:
Unrealized holding gains (losses) on securities arising during the period, Pre-tax Amount	$ 998	$ 9,125	$ 1,097	$ 7,509
Unrealized holding gains on securities arising during the period, Tax (Expense) Benefit	(344)	(3,193)	(378)	(2,628)
Unrealized holding gains on securities arising during the period, Net of Tax Amount	654	5,932	719	4,881
Non-credit related (losses) gains on securities not expected to be sold	(1,323)	448	175	2,317
Non-credit related (losses) gains on securities not expected to be sold, Tax (Expense) Benefit	463	(157)	(61)	(811)
Non-credit related gains on securities not expected to be sold	(860)	291	114	1,506
Reclassification adjustment for losses on securities included in net income, Pre Tax amount	0	(1,608)	0	(2,185)
Reclassification adjustment for losses on securities included in net income, Tax (Expense) Benefit	0	563	0	765
Reclassification adjustment for losses on securities included in net income, Net of Tax Amount	0	(1,045)	0	(1,420)
Total other comprehensive (loss) income, Pre-tax Amount	(325)	7,965	1,272	7,641
Total other comprehensive (loss) income, Tax (Expense) Benefit	119	(2,787)	(439)	(2,674)
Total other comprehensive (loss) income, Net of Tax Amount	$ (206)	$ 5,178	$ 833	$ 4,967