Consolidated Statements Of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Operating Activities:
Net income	$ 82,883	$ 73,041
Adjustments to reconcile net income to net cash (used for) provided by operating activities
Provision for credit losses	15,561	8,540
Depreciation and amortization	15,813	15,510
Stock-based compensation expense	5,286	3,754
Tax expense from stock-based compensation arrangements	(596)	(61)
Excess tax benefits from stock-based compensation arrangements	(476)	(226)
Net amortization of premium on securities	205	3,419
Mortgage servicing rights fair value change, net	258	712
Originations and purchases of mortgage loans held-for-sale	(2,121,237)	(1,368,131)
Proceeds from sales of mortgage loans held-for-sale	2,034,173	1,371,124
Bank owned life insurance, net of claims	(1,470)	(1,387)
Increase in trading securities, net	(391)	(1,737)
Net (increase) decrease in brokerage customer receivables	(5,532)	2,754
Gains on mortgage loans sold	(58,929)	(32,293)
(Gains) losses on available-for-sale securities, net	(500)	369
Losses on sales of premises and equipment, net	403	561
Net (gains) losses on sales and fair value adjustments of other real estate owned	430	3,360
(Increase) decrease in accrued interest receivable and other assets, net	(38,117)	43,274
Increase in accrued interest payable and other liabilities, net	17,757	4,253
Net Cash (Used for) Provided by Operating Activities	(54,479)	126,836
Investing Activities:
Proceeds from maturities of available-for-sale securities	335,286	213,384
Proceeds from sales of available-for-sale securities	1,134,033	196,042
Purchases of available-for-sale securities	(1,353,356)	(608,800)
Net cash received (paid) for acquisitions	12,004	(7,267)
Proceeds from sales of other real estate owned	24,444	47,160
Proceeds received from the FDIC related to reimbursements on covered assets	150	10,818
Net decrease (increase) in interest bearing deposits with banks	406,784	(11,297)
Net increase in loans	(965,794)	(822,314)
Redemption of bank owned life insurance	2,701	0
Purchases of premises and equipment, net	(25,478)	(17,386)
Net Cash Used for Investing Activities	(429,226)	(999,660)
Financing Activities:
Increase in deposit accounts	630,785	882,631
Increase (decrease) in other borrowings, net	54,575	(211,388)
(Decrease) increase in Federal Home Loan Bank advances, net	(293,584)	163,000
Proceeds from the issuance of preferred stock, net	121,151	0
Proceeds from the issuance of subordinated notes, net	0	139,090
Excess tax benefits from stock-based compensation arrangements	476	226
Issuance of common shares resulting from the exercise of stock options and the employee stock purchase plan	5,812	5,262
Common stock repurchases	(415)	(449)
Dividends paid	(13,593)	(12,434)
Net Cash Provided by Financing Activities	505,207	965,938
Net Increase in Cash and Cash Equivalents	21,502	93,114
Cash and Cash Equivalents at Beginning of Period	230,707	263,864
Cash and Cash Equivalents at End of Period	$ 252,209	$ 356,978