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	$ 95,276	$ 85,950
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Provision for loan losses	8,000	0
Depreciation and amortization	24,016	20,832
(Recovery of) addition to valuation allowance on mortgage servicing rights, net	(13,282)	2,036
Amortization of mortgage servicing rights	9,191	11,775
Amortization of other intangible assets	2,022	2,098
Amortization and accretion on earning assets, funding, and other, net	26,294	30,013
Tax impact of stock-based compensation	149	5
(Gain) loss on sales of investment securities, net and impairment write-downs	(334)	(603)
(Gain) loss on sales of assets and impairment write-downs, net	(792)	8,578
Gain on mortgage banking activities, net	(14,808)	(29,459)
Mortgage loans originated and acquired for sale	(1,463,808)	(1,301,779)
Proceeds from sales of mortgage loans held for sale	1,525,083	1,409,805
(Increase) decrease in interest receivable	(2,581)	4,744
Increase (decrease) in interest payable	(1,177)	(4,601)
Net change in other assets and other liabilities	(88)	(3,637)
Net cash provided by (used in) operating activities	193,161	235,757
CASH FLOWS FROM INVESTING ACTIVITIES
Net (increase) decrease in loans	(392,504)	(857,350)
Purchases of:
Investment securities	(947,634)	(592,477)
Premises, equipment, and software, net of disposals	(31,548)	(33,063)
FHLB stock	(28,399)
Other assets	(884)	(2,810)
Proceeds from:
Sales of investment securities	64,055	113,752
Sale of FHLB stock	14,399	15,314
Prepayments, calls and maturities of investment securities	775,952	882,830
Sales, prepayments, calls, and maturities of other assets	21,100	11,092
Sales of loans originated for investment	12,172	124,903
Net cash provided by (used in) investing activities	(513,291)	(337,809)
CASH FLOWS FROM FINANCING ACTIVITIES
Net increase (decrease) in deposits	192,571	136,061
Net decrease in deposits due to branch sales		(113,622)
Net increase (decrease) in short-term funding	437,561	138,785
Repayment of long-term funding	(400,110)	(25,968)
Proceeds from issuance of preferred stock		0
Cash dividends on common stock	(26,957)	(17,379)
Cash dividends on preferred stock	(2,600)	(2,600)
Purchase of treasury stock	(63,239)	(31,210)
Net cash provided by (used in) financing activities	137,226	84,067
Net increase (decrease) in cash and cash equivalents	(182,904)	(17,985)
Cash and cash equivalents at beginning of period	737,873	616,595
Cash and cash equivalents at end of period	554,969	598,610
Supplemental disclosures of cash flow information:
Cash paid for interest	34,997	54,812
Cash (received) paid for income taxes	20,419	(21,550)
Loans and bank premises transferred to other real estate owned	14,716	22,536
Capitalized mortgage servicing rights	$ 11,367	$ 13,147