Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Cash Flows from Operating Activities:
Net income	$ 88,047	$ 61,266
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization, and accretion	30,051	24,607
Provision for loan and lease losses	24,000	35,000
Realized (loss) gain on available-for-sale securities, net	53	(1,602)
Deferred income tax expense	30,552	3,253
Gain on sale of loans and leases	(9,256)	(8,146)
Gain on sale of foreclosed assets	(470)	(640)
Loss on sale of fixed assets	285	0
Mortgage loans originated for sale	(272,513)	(238,313)
Proceeds from sale of mortgage loans originated for sale	287,009	258,425
Payments received on loans and leases transferred from held for sale to held for investment, net of (advances) on home equity lines of credit	21,753	(23,063)
Increase in cash surrender value of bank-owned life insurance	(2,843)	(2,724)
Increase in accrued interest receivable	(2,361)	(3,558)
Increase in accrued interest payable	1,627	1,230
Decrease in accrued expenses and taxes payable	(5,224)	(5,515)
Other, net	9,774	17,758
Net cash provided by operating activities	200,484	117,978
Cash Flows from Investing Activities:
Net decrease in restricted short-term investments	28,929	1,961
Activity in available-for-sale securities:
Sales	33,763	152,624
Maturities, repayments, and calls	354,445	357,675
Purchases	(224,074)	(635,747)
Net decrease (increase) in restricted investment in bank stock	1,685	(6,283)
Net increase in loans and leases	(322,779)	(197,141)
Purchase of bank-owned life insurance	(4,843)	(4,087)
Proceeds from bank-owned life insurance	6,678	4,586
Proceeds from sale of foreclosed assets	12,661	22,211
Acquisitions	0	(2,487)
Additions to premises and equipment, net	(6,761)	(4,890)
Net cash used in investing activities	(120,296)	(311,578)
Cash Flows from Financing Activities:
Net increase in deposits	184,186	325,680
Net (decrease) increase in other short-term borrowings	(111,512)	25,141
Net decrease in short-term FHLB borrowings	(28,000)	0
Repayment of long-term FHLB borrowings	(8,005)	(8,851)
Repayment of long-term debt	(24,436)	(25,792)
Proceeds from issuance of common stock	4,621	2,922
Purchase of treasury stock	(25)	(19)
Cash dividends paid	(14,948)	(14,105)
Net cash provided by financing activities	1,881	304,976
Net change in cash and cash equivalents	82,069	111,376
Cash and cash equivalents at January 1	316,592	332,145
Cash and cash equivalents at June 30	398,661	443,521
Supplemental Disclosure of Cash Flow Information
Cash paid for interest on deposits and borrowings	50,880	60,263
Income tax (refunds) payments	(21,006)	8,046
Supplemental Schedule of Noncash Activities
Real estate acquired in settlement of loans	6,987	24,792
Securities purchased not settled	$ 0	$ 174,552