Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Cash flows from operating activities:
Net income	$ 41,549	$ 25,224
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	875	23,250
Net (gain) loss on disposal of property and equipment	(16)	(501)
Depreciation and amortization	8,298	8,568
Net premium amortization on investment securities	7,902	5,188
Net gains on investment securities transactions	4	(229)
Net gains on sales of mortgage loans held for sale	(14,984)	(12,423)
Net gain on sale of OREO	(2,671)	6
OREO valuation adjustments	3,180	1,217
Net impairment (reversal of impairment) of mortgage servicing rights	(59)	(816)
Gain Loss on Sale of Mortgage Servicing	0	19
Deferred income tax expense	3,456	5,030
Net increase in cash surrender value of company-owned life insurance policies	(873)	(969)
Stock-based compensation expense	2,022	1,724
Tax benefits from stock-based compensation expense	524	126
Excess tax benefits from stock-based compensation	(468)	(108)
Originations of mortgage loans held for sale, net of sales	4,991	(12,265)
Changes in operating assets and liabilities:
Increase in interest receivable	(403)	1,038
Decrease in other assets	7,004	1,754
Decrease in accrued interest payable	(266)	92
Decrease in accounts payable and accrued expenses	(4,112)	(8,659)
Net cash provided by operating activities	55,953	37,228
Cash flows from investing activities:
Purchases of held-to-maturity investment securities	(13,755)	(19,104)
Purchases of available-for-sale investment securities	(430,395)	(439,614)
Proceeds from maturities and paydowns of held-to-maturity investment securities	5,807	4,739
Proceeds from maturities and paydowns of available-for-sale investment securities	453,678	536,527
Capital distribution by unconsolidated subsidiary trust	0	1,238
Proceeds from sales of mortgage servicing rights	470	907
Extensions of credit to customers, net of repayments	(84,078)	(29,736)
Recoveries of loans charged-off	7,057	2,795
Proceeds from sales of OREO	18,464	15,674
Capital contribution to unconsolidated equity method investee	(1,886)	(8,467)
Net cash used in investing activities	(44,638)	64,959
Cash flows from financing activities:
Net increase (decrease) in deposits	(310,079)	74,408
Net decrease in repurchase agreements	(84,471)	(60,250)
Net increase (decrease) in short-term borrowings	(30)	0
Repayment of junior subordinated debentures held by subsidiary trusts	0	41,238
Repayments of long-term debt	(21)	(19)
Redemption of preferred stock	(50,000)
Proceeds from issuance of common stock	5,799	1,263
Excess tax benefits from stock-based compensation	468	108
Purchase and retirement of common stock	(448)	(257)
Dividends paid to common stockholders	(5,648)	(10,290)
Dividends paid to preferred stockholders	0	(1,706)
Net cash provided by (used in) financing activities	(444,430)	(37,981)
Net increase (decrease) in cash and cash equivalents	(433,115)	64,206
Cash and cash equivalents at beginning of period	801,332	472,447
Cash and cash equivalents at end of period	368,217	536,653
Supplemental disclosures of cash flow information:
Cash paid during the period for income taxes	20,838	12,740
Cash paid during the period for interest expense	$ 11,252	$ 16,224