CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Cash Flows From Operating Activities:
Net income	$ 17,962	$ 17,518
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	4,940	3,295
Gains on sales of securities	(2,401)	(48)
Provision for loan losses	800	1,850
Stock-based compensation expense	1,050	1,043
Increase in income tax liability	1,194	531
Increase in pension liability	624	286
Other operating activities, net	826	(1,447)
Net cash provided by operating activities	24,995	23,028
Cash Flows From Investing Activities:
Proceeds from sales of securities available-for-sale	33,234	5,405
Proceeds from maturities of securities available-for-sale	6,920	10,185
Purchase of securities available-for-sale	(96,704)	(19,974)
Net (increase) decrease in loans	(11,042)	15,517
Increase in payments in excess of funding	(12,653)	(30,222)
Purchases of premises and equipment, net	(1,198)	(1,765)
Acquisition of waste expense management service company's assets	(7,798)	0
Net cash used in investing activities	(89,241)	(20,854)
Cash Flows From Financing Activities:
Net increase in noninterest-bearing demand deposits	8,721	12,883
Net (decrease) increase in interest-bearing demand and savings deposits	(6,413)	31,804
Net decrease in time deposits	(2,342)	(13,485)
Net increase in accounts and drafts payable	53,743	167,132
Cash dividends paid	(5,298)	(4,519)
Distribution of stock awards, net	(321)	(249)
Other financing activities, net	0	114
Net cash provided by financing activities	48,090	193,680
Net (decrease) increase in cash and cash equivalents	(16,156)	195,854
Cash and cash equivalents at beginning of period	235,962	138,929
Cash and cash equivalents at end of period	219,806	334,783
Supplemental information:
Cash paid for interest	2,401	3,386
Cash paid for income taxes	$ 4,966	$ 6,211