Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Cash Flows from Operating Activities:
Net income	$ 42,399	$ 23,473
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization, and accretion	13,376	11,476
Provision for loan and lease losses	12,000	19,000
Realized gain on available-for-sale securities, net	(18)	(241)
Deferred income tax expense	13,618	13,778
Gain on sale of loans and leases	(4,878)	(3,750)
Loss (gain) on sale of foreclosed assets	225	(607)
Loss on sale of fixed assets	280	0
Mortgage loans originated for sale	(132,464)	(113,772)
Proceeds from sale of mortgage loans originated for sale	150,876	119,668
Payments received on loans and leases transferred from held for sale to held for investment, net of (advances) on home equity lines of credit	11,928	38,503
Increase in cash surrender value of bank-owned life insurance	(1,296)	(1,273)
Increase in accrued interest receivable	(3,898)	(8,866)
(Decrease) increase in accrued interest payable	(1,246)	1,029
Decrease in accrued expenses and taxes payable	(19,297)	(18,629)
Other, net	9,977	(1,658)
Net cash provided by operating activities	91,582	78,131
Cash Flows from Investing Activities:
Net decrease in restricted short-term investments	7,302	9,564
Activity in available-for-sale securities:
Sales	12,770	10,350
Maturities, repayments, and calls	154,037	163,205
Purchases	(24,139)	(299,694)
Net decrease in restricted investment in bank stock	460	4,059
Net increase in loans and leases	(151,317)	(158,684)
Purchase of bank-owned life insurance	(2,694)	(1,874)
Proceeds from bank-owned life insurance	3,909	2,259
Proceeds from sale of foreclosed assets	5,733	12,792
Acquisitions	0	(2,487)
Additions to premises and equipment, net	(878)	(1,211)
Net cash (used in) provided by investing activities	5,183	(261,721)
Cash Flows from Financing Activities:
Net increase in deposits	111,386	198,697
Net (decrease) increase in other short-term borrowings	(31,326)	100,224
Net decrease in short-term FHLB borrowings	(150,000)	(50,000)
Repayment of long-term FHLB borrowings	(4,038)	(4,605)
Repayment of long-term debt	(11,861)	(12,328)
Proceeds from issuance of common stock	2,599	1,986
Purchase of treasury stock	(21)	(15)
Cash dividends paid	0	(4,654)
Net cash provided by (used in) financing activities	(83,261)	229,305
Net change in cash and cash equivalents	13,504	45,715
Cash and cash equivalents at January 1	316,592	332,145
Cash and cash equivalents at March 31	330,096	377,860
Supplemental Disclosure of Cash Flow Information
Cash paid for interest on deposits and borrowings	27,441	30,784
Income tax refunds	24,441	809
Supplemental Schedule of Noncash Activities
Real estate acquired in settlement of loans	3,511	11,144
Securities purchased not settled	0	80,557
Securities Sold Not Settled	$ 22,320	$ 0