Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Cash flows from operating activities:
Net income	$ 41,379	$ 31,281
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	32,750	44,400
Net (gain) loss on disposal of property and equipment	(490)	28
Depreciation and amortization	12,770	12,997
Net premium amortization on investment securities	7,913	7,373
Net gains on investment securities transactions	(295)	(56)
Net gains on sales of mortgage loans held for sale	(20,648)	(8,730)
Net gain on sale of OREO	(768)	(533)
OREO valuation adjustments	3,457	5,972
Net impairment (reversal of impairment) of mortgage servicing rights	(761)	848
Net gain on sale of mortgage servicing rights	(19)	0
Deferred income tax expense	8,013	400
Net increase in cash surrender value of company-owned life insurance policies	(1,491)	(1,306)
Stock-based compensation expense	2,351	1,648
Tax benefits from stock-based compensation expense	296	204
Excess tax benefits from stock-based compensation	(187)	(129)
Originations of mortgage loans held for sale, net of sales	(2,055)	799
Changes in operating assets and liabilities:
Increase in interest receivable	(1,442)	(1,366)
Decrease in other assets	7,381	11,373
Decrease in accrued interest payable	(1,417)	(4,392)
Decrease in accounts payable and accrued expenses	(1,800)	(1,404)
Net cash provided by operating activities	84,937	99,407
Cash flows from investing activities:
Purchases of held-to-maturity investment securities	(44,283)	(11,626)
Purchases of available-for-sale investment securities	(787,697)	(704,619)
Proceeds from maturities and paydowns of held-to-maturity investment securities	9,069	8,940
Proceeds from maturities and paydowns of available-for-sale investment securities	817,903	611,918
Capital distribution by unconsolidated subsidiary trust	1,238	0
Proceeds from sales of mortgage servicing rights	907	596
Extensions of credit to customers, net of repayments	(61,721)	40,278
Recoveries of loans charged-off	4,320	4,269
Proceeds from sales of OREO	31,800	12,247
Capital contribution to unconsolidated equity method investment	(900)	0
Capital contribution to unconsolidated equity method investee	(11,973)	(7,099)
Net cash used in investing activities	(41,337)	(45,096)
Cash flows from financing activities:
Net increase (decrease) in deposits	208,761	(74,394)
Net decrease in repurchase agreements	(55,438)	(144,632)
Net increase (decrease) in short-term borrowings	(1)	131
Repayment of junior subordinated debentures held by subsidiary trusts	(41,238)	0
Repayments of long-term debt	(30)	(33)
Proceeds from issuance of common stock	1,326	272
Excess tax benefits from stock-based compensation	187	129
Purchase and retirement of common stock	(262)	(197)
Dividends paid to common stockholders	(15,448)	(14,419)
Dividends paid to preferred stockholders	(2,569)	(2,559)
Net cash provided by (used in) financing activities	95,288	(235,702)
Net increase (decrease) in cash and cash equivalents	138,888	(181,391)
Cash and cash equivalents at beginning of period	472,447	685,618
Cash and cash equivalents at end of period	611,335	504,227
Supplemental disclosures of cash flow information:
Cash paid during the period for income taxes	12,740	12,420
Cash paid during the period for interest expense	$ 24,903	$ 37,452