Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Cash flows from operating activities:
Net income	$ 25,224	$ 19,360
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	23,250	30,400
Net (gain) loss on disposal of property and equipment	(501)	3
Depreciation and amortization	8,568	8,677
Net premium amortization on investment securities	5,188	4,932
Net gains on investment securities transactions	(229)	(18)
Net gains on sales of mortgage loans held for sale	(12,423)	(4,984)
Net (gain) loss on sale of OREO	6	(420)
Write-down of OREO and other assets pending disposal	1,217	3,515
Net reversal of impairment of mortgage servicing rights	(816)	(320)
Net gain on sale of mortgage servicing rights	(19)	0
Deferred income tax (benefit) expense	5,030	(538)
Net increase in cash surrender value of company-owned life insurance policies	(969)	(1,024)
Stock-based compensation expense	1,724	1,116
Tax benefits from stock-based compensation expense	126	224
Excess tax benefits from stock-based compensation	(108)	(157)
Originations of mortgage loans held for sale, net of sales	(12,265)	21,709
Changes in operating assets and liabilities:
Decrease in interest receivable	1,038	40
Decrease in other assets	1,754	11,881
Increase (decrease) in accrued interest payable	92	(1,466)
Decrease in accounts payable and accrued expenses	(8,659)	(3,275)
Net cash provided by operating activities	37,228	89,655
Cash flows from investing activities:
Purchases of held-to-maturity investment securities	(19,104)	(7,434)
Purchases of available-for-sale investment securities	(439,614)	(406,564)
Proceeds from maturities and paydowns of held-to-maturity investment securities	4,739	5,405
Proceeds from maturities and paydowns of available-for-sale investment securities	536,527	335,877
Capital distribution by unconsolidated subsidiary trust	1,238	0
Proceeds from sales of mortgage servicing rights	907	0
Extensions of credit to customers, net of repayments	(29,736)	34,535
Recoveries of loans charged-off	2,795	2,140
Proceeds from sales of OREO	15,674	7,963
Capital expenditures, net of sales	(8,467)	(4,730)
Net cash provided by (used in) by investing activities	64,959	(32,808)
Cash flows from financing activities:
Net increase (decrease) in deposits	74,408	(131,048)
Net decrease in repurchase agreements	(60,250)	(185,115)
Net increase in short-term borrowings	0	449
Repayment of junior subordinated debentures held by subsidiary trusts	(41,238)	0
Repayments of long-term debt	(19)	(22)
Proceeds from issuance of common stock	1,263	102
Excess tax benefits from stock-based compensation	108	157
Purchase and retirement of common stock	(257)	(193)
Dividends paid to common stockholders	(10,290)	(9,607)
Dividends paid to preferred stockholders	(1,706)	(1,697)
Net cash used in financing activities	(37,981)	(326,974)
Net increase (decrease) in cash and cash equivalents	64,206	(270,127)
Cash and cash equivalents at beginning of period	472,447	685,618
Cash and cash equivalents at end of period	536,653	415,491
Supplemental disclosures of cash flow information:
Cash paid during the period for income taxes	12,740	8,730
Cash paid during the period for interest expense	$ 16,224	$ 24,535