Tax Effect Allocated to Each Component of Other Comprehensive Income (Loss) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Adjustment of pension and postretirement benefit plans	$ 0	$ 0	$ 0	$ 0
Amortization of net losses	(1,740)	(965)	(5,220)	(2,896)
Amortization of prior service cost	15	72	45	216
Unrealized holding gains (losses) on securities available-for-sale arising during the period	1,193	(1,611)	5,428	(4,101)
Reclassification adjustment for (gains) losses on securities available-for-sale included in net income (loss)	0	1,233	0	1,219
Unrealized net (gains) losses on cash flow hedges	1,886	1,805	3,783	2,982
Reclassification adjustment for (gains) losses on cash flow hedges included in net income (loss)	(1,110)	(1,242)	(2,903)	(2,200)
Income tax expense	$ 244	$ (708)	$ 1,133	$ (4,780)