CONDENSED 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	$ 12,162	$ 7,207	$ 22,720		$ 15,683
Investments available-for-sale:
Net change in unrealized gains (losses) on investments available-for-sale	(20,847)	2,452	(23,893)		1,349
Related income tax (expense) benefit	8,313	(977)	9,528		(538)
Net investment gains reclassified into earnings	62	90	118		163
Related income tax expense	(24)	(36)	(47)		(65)
Net effect on other comprehensive income (loss) for the period	(12,496)	1,529	(14,294)		909
Defined benefit pension plan:
Recognition of unrealized gain	563	349	927	[1]	699	[1]
Related income tax expense	(224)	(139)	(370)		(279)
Net effect on other comprehensive income for the period	339	210	557		420
Total other comprehensive income (loss)	(12,157)	1,739	(13,737)		1,329
Comprehensive income	$ 5	$ 8,946	$ 8,983		$ 17,012

[1] This amount is included in the computation of net periodic pension cost, see Note 10