CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Operating activities:
Net income	$ 26,346	$ 24,282
Adjustments to reconcile net income to net cash provided (used) by operating activities:
Provision for loan and lease losses	2,050	4,309
Depreciation of premises and equipment	2,331	2,094
Depreciation of equipment owned and leased to others	6,499	8,114
Amortization of investment security premiums and accretion of discounts, net	1,929	1,999
Amortization of mortgage servicing rights	937	1,528
Mortgage servicing asset recoveries		(147)
Deferred income taxes	(2,020)	(3,996)
Investment securities and other investment gains	(211)	(403)
Originations of loans held for sale, net of principal collected	(59,773)	(96,948)
Proceeds from the sales of loans held for sale	62,295	94,491
Net gain on sale of loans held for sale	(2,492)	(2,736)
Change in trading account securities	(20)	(6)
Change in interest receivable	(912)	(312)
Change in interest payable	1,041	1,702
Change in other assets	10,939	7,894
Change in other liabilities	(7,795)	(4,542)
Other	341	586
Net change in operating activities	41,485	37,909
Investing activities:
Proceeds from sales of investment securities		40,236
Proceeds from maturities of investment securities	112,836	159,553
Purchases of investment securities	(81,041)	(169,504)
Net change in other investments	200	(960)
Loans sold or participated to others	19,819	15,494
Net change in loans and leases	(187,832)	(199,988)
Net change in equipment owned under operating leases	(7,182)	3,173
Purchases of premises and equipment	(3,361)	(3,082)
Net change in investing activities	(146,561)	(155,078)
Financing activities:
Net change in demand deposits, NOW accounts and savings accounts	61,457	92,814
Net change in certificates of deposit	14,995	(26,938)
Net change in short-term borrowings	32,716	8,694
Proceeds from issuance of long-term debt	12,035	25,600
Payments on long-term debt	(26,296)	(268)
Net proceeds from issuance of treasury stock	3,419	3,644
Acquisition of treasury stock	(619)	(2,617)
Cash dividends paid on common stock	(8,544)	(8,007)
Net change in financing activities	89,163	92,922
Net change in cash and cash equivalents	(15,913)	(24,247)
Cash and cash equivalents, beginning of year	83,934	114,327
Cash and cash equivalents, end of period	68,021	90,080
Non-cash transactions:
Loans transferred to other real estate and repossessed assets	2,510	1,791
Common stock matching contribution to Employee Stock Ownership and Profit Sharing Plan	$ 2,801	$ 2,643