CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012
Net income	$ 6,331		$ 6,412		$ 11,993		$ 12,995
Unrealized (losses) gains on securities available-for-sale:
Unrealized holding (losses) gains on securities available-for-sale arising during period, net of related tax effects of $6,808, ($1,475), $8,315 and ($819), respectively	(12,644)		2,740		(15,443)		1,521
Less: reclassification adjustment for gains included in net income, net of related tax effects of $0, $263, $48 and $305, respectively	0		(488)		(90)		(567)
Net unrealized gains (losses) on securities available-for-sale	(12,644)		2,252		(15,533)		954
Unrealized gain (loss) on cash flow hedging derivatives, net of related tax effects of ($1,236), $1,227, ($1,694) and $406, respectively	2,296		(2,279)		3,146		(754)
Postretirement plans:
Net actuarial gain arising during period, net of related tax effects of ($21), ($13), ($42) and ($26), respectively	40		24		79		48
Plus: amortization of prior service cost included in net periodic cost, net of related tax effects of ($4), ($2) ($8) and ($3)(1), respectively	7	[1]	3	[1]	15	[1]	6	[1]
Other comprehensive income (loss)	(10,301)		0		(12,293)		254
Comprehensive income (loss)	$ (3,970)		$ 6,412		$ (300)		$ 13,249

[1] Reclassified into the consolidated statements of income in salaries and employee benefits.