Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 45,199	$ 47,388
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Provision for credit losses	5,000	3,300
Depreciation and amortization	13,094	11,968
(Recovery of) addition to valuation allowance on mortgage servicing rights, net	(156)	(5,216)
Amortization of mortgage servicing rights	2,725	4,989
Amortization of other intangible assets	991	1,011
Amortization and accretion on earning assets, funding, and other, net	6,537	14,069
Tax impact of stock-based compensation	545	59
(Gain) loss on sales of investment securities, net and impairment write-downs	(378)	(300)
(Gain) loss on sales of assets and impairment write-downs, net	(728)	(836)
Gain on mortgage banking activities, net	(4,100)	(15,493)
Mortgage loans originated and acquired for sale	(203,764)	(681,410)
Proceeds from sales of mortgage loans held for sale	224,348	779,022
(Increase) decrease in interest receivable	(3,009)	(3,226)
Increase (decrease) in interest payable	(6,474)	(7,276)
Net change in other assets and other liabilities	(6,165)	(14,637)
Net cash provided by (used in) operating activities	73,665	133,412
CASH FLOWS FROM INVESTING ACTIVITIES
Net (increase) decrease in loans	(555,979)	(179,438)
Purchases of:
Available for sale securities	(273,627)	(511,419)
Premises, equipment, and software, net of disposals	(10,848)	(16,223)
FHLB stock	(111)	0
Held to maturity securities	(18,857)	(13,240)
Other assets	(850)	(797)
Proceeds from:
Sales of available for sale securities	80,025	61,457
Sale of FHLB stock	0	14,399
Prepayments, calls and maturities of investment securities	180,880	403,763
Prepayments, calls, and maturities of other assets	11,036	9,385
Sales of loans originated for investment	0	12,172
Net cash provided by (used in) investing activities	(588,331)	(219,941)
CASH FLOWS FROM FINANCING ACTIVITIES
Net increase (decrease) in deposits	242,760	481,429
Net increase (decrease) in short-term funding	506,980	(557,387)
Repayment of long-term funding	(155,009)	(100,076)
Proceeds from issuance of preferred stock		0
Redemption of preferred stock	(806)	0
Cash dividends on common stock	(14,639)	(13,483)
Cash dividends on preferred stock	(1,244)	(1,300)
Purchase of treasury stock	(42,199)	(33,125)
Net cash provided by (used in) financing activities	535,843	(223,942)
Net increase (decrease) in cash and cash equivalents	21,177	(310,471)
Cash and cash equivalents at beginning of period	602,245	737,873
Cash and cash equivalents at end of period	623,422	427,402
Supplemental disclosures of cash flow information:
Cash paid for interest	19,578	24,946
Cash (received) paid for income taxes	4,165	0
Loans and bank premises transferred to other real estate owned	6,343	12,408
Capitalized mortgage servicing rights	$ 1,725	$ 5,902