Consolidated Statement of Comprehensive Income (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Consolidated Statement Of Comprehensive Income (Loss) [Abstract]
Net income (loss) from continuing operations, Before-tax Amount	$ 12,350	$ 11,842
Net income (loss) from continuing operations, Tax (Expense) Benefit	(585)	(314)
Net income (loss) from continuing operations	11,765	11,528
Unrealized (losses) gains on available-for-sale securities:
Unrealized holding gains (losses) arising during period, Before-tax Amount	1,641	(3,340)
Unrealized holding gains (losses) arising during period, Tax (Expense) Benefit	(621)	1,299
Unrealized holding gains (losses) arising during period, Net of Tax Amount	1,020	(2,041)
Reclassification adjustment for gains included in net income (loss), Before-tax Amount	(116)	(557)
Reclassification adjustment for gains included in net income (loss), Tax (Expense) Benefit	45	217
Reclassification adjustment for gains included in net income (loss), Net of Tax Amount	(71)	(340)
Valuation allowance for the change in deferred taxes arising from unrealized gains and losses on available for sale securities, Tax (Expense) Benefit	576	(1,516)
Valuation allowance for the change in deferred taxes arising from unrealized gains and losses on available for sale securities, Net of tax Amount	576	(1,516)
Net unrealized gains (losses), Before-tax Amount	1,525	(3,897)
Net unrealized gains (losses), Tax (Expense) Benefit	0	0
Net unrealized gains (losses), Net of Tax Amount	1,525	(3,897)
Amortization of gains included in net income (loss) on available-for-sale securities transferred to held-to-maturity, Before-tax Amount	(319)	(413)
Amortization of gains included in net income (loss) on available-for-sale securities transferred to held-to-maturity, Tax (Expense) Benefit	124	160
Amortization of gains included in net income (loss) on available-for-sale securities transferred to held-to-maturity, Net of Tax Amount	(195)	(253)
Valuation allowance for the change in deferred taxes arising from the amortization of gains included in net income (loss) on available for sale securities transferred to held to maturity, Tax (Expense) Benefit	(124)	(160)
Valuation allowance for the change in deferred taxes arising from the amortization of gains included in net income (loss) on available for sale securities transferred to held to maturity, Net of Tax Amount	(124)	(160)
Net unrealized losses, Before-tax Amount	(319)	(413)
Net unrealized losses, Tax (Expense) Benefit	0	0
Net unrealized losses, Net of Tax Amount	(319)	(413)
Amortization of gains included in net income (loss) on derivative financial instruments accounted for as cash flow hedges, Before-tax Amount	(538)	(1,600)
Amortization of gains included in net income (loss) on derivative financial instruments accounted for as cash flow hedges, Tax (Expense) Benefit	209	622
Amortization of gains included in net income (loss) on derivative financial instruments accounted for as cash flow hedges, Net of Tax Amount	(329)	(978)
Unrealized losses on derivative financial instruments accounted for as cash flow hedges, Before-tax Amount	430
Unrealized losses on derivative financial instruments accounted for as cash flow hedges, Tax (Expense) Benefit	(167)
Unrealized losses on derivative financial instruments accounted for as cash flow hedges, Net of Tax Amount	263
Valuation allowance for the change in deferred taxes arising from unrealized gains and losses and amortization of gains included in net income (loss) on cash flow hedges, Tax (Expense) Benefit	(42)	(622)
Valuation allowance for the change in deferred taxes arising from unrealized gains and losses and amortization of gains included in net income (loss) on cash flow hedges, Net of Tax Amount	(42)	(622)
Net unrealized losses, Before-tax Amount	(108)	(1,600)
Net unrealized losses, Tax (Expense) Benefit	0	0
Net unrealized losses, Net of Tax Amount	(108)	(1,600)
Net actuarial loss on defined benefit pension plan, Before-tax Amount	(415)
Net actuarial loss on defined benefit pension plan, Tax (Expense) Benefit	161
Net actuarial loss on defined benefit pension plan, Net of Tax Amount	(254)
Reclassification of unamortized prior service cost and actuarial losses, Before-tax Amount	132	154
Reclassification of unamortized prior service cost and actuarial losses, Tax (Expense) Benefit	(51)	(60)
Reclassification of unamortized prior service cost and actuarial losses, Net of Tax Amount	81	94
Valuation allowance for the change in deferred taxes arising from reclassification of unamortized prior service cost and actuarial losses and amortization of prior service cost and actuarial losses, Tax (Expense) Benefit	(110)	60
Valuation allowance for the change in deferred taxes arising from reclassification of unamortized prior service cost and actuarial losses and amortization of prior service cost and actuarial losses, Net of Tax Amount	(110)	60
Net defined benefit pension plan activity, Before-tax Amount	(283)	154
Net defined benefit pension plan activity, Tax (Expense) Benefit	0	0
Net defined benefit pension plan activity, Net of Tax Amount	(283)	154
Total other comprehensive loss, Before-tax Amount	815	(5,756)
Total other comprehensive loss, Tax (Expense) Benefit	0	0
Total other comprehensive loss, Before-tax Amount	815	(5,756)
Comprehensive income (loss), Before-tax Amount	13,165	6,086
Comprehensive income (loss), Tax (Expense) Benefit	(585)	(314)
Comprehensive income (loss), Net of Tax Amount	$ 12,580	$ 5,772