Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Operating Activities
Net income	$ 33,219	$ 20,991
Adjustment to reconcile net income to net cash provided by operating activities:
Provision for credit losses	14,838	29,904
Deferred tax expense	2,507	1,387
Depreciation and amortization	5,736	7,058
Net (gains) losses on securities and other assets	(1,392)	5,861
Net amortization of premiums and discounts on securities	1,075	794
Net accretion of premiums and discounts on long-term debt	(84)	(96)
Income from increase in cash surrender value of bank owned life insurance	(4,369)	(4,158)
Decrease in interest receivable	1,426	1,063
Decrease in interest payable	(2,087)	(1,921)
Increase (decrease) in income taxes payable	6,294	(718)
Other-net	(2,567)	(1,222)
Net cash provided by operating activities	54,596	58,943
Transactions with securities available for sale:
Proceeds from sales	0	75,074
Proceeds from maturities and redemptions	410,909	358,875
Purchases	(395,337)	(489,963)
Proceeds from the redemption of FHLB stock	7,317	6,969
Proceeds from bank owned life insurance	2,071	88
Proceeds from sale of loans	15,981	5,763
Proceeds from sales of other assets	15,301	7,037
Purchases of premises and equipment	(6,468)	(6,542)
Net (increase) decrease in loans	(185,018)	184,440
Net cash (used in) provided by investing activities	(135,244)	141,741
Financing Activities
Net decrease in federal funds purchased	(54,800)	(800)
Net increase (decrease) in other short-term borrowings	203,792	(13,281)
Net decrease in deposits	(10,206)	(132,912)
Repayments of other long-term debt	(25,358)	(24,444)
Proceeds from issuance of common stock	0	144
Discount on dividend reinvestment plan purchases	(67)	(48)
Dividends paid	(13,633)	(9,418)
Proceeds from reissuance of treasury stock	617	72
Purchase of treasury stock	(9,112)	(9)
Stock option tax benefit	1	0
Net cash provided by (used in) financing activities	91,234	(180,696)
Net increase in cash and cash equivalents	10,586	19,988
Cash and cash equivalents at January 1	78,478	69,858
Cash and cash equivalents at September 30	$ 89,064	$ 89,846