Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Operating Activities:
Net income (loss)	$ 41,560	$ 43,490
Adjustment to reconcile net income to net cash provided by operating activities:
Provision for credit losses	7,000	16,000
Depreciation and amortization	13,316	13,540
Deferred taxes	(3,002)
Amortization of intangibles	1,465	1,504
Amortization of debt securities premium and discount, net	7,736	6,562
Share-based compensation expense	1,522	1,524
Security gains, net	(22)	(251)
Net deferred loan origination expense	(3,843)	(4,085)
Excess tax benefit from exercise of stock options	19
Decrease in interest receivable	2,931	3,908
Decrease in interest payable	(910)	(1,483)
Realized gain on mortgages sold	(29,260)	(27,693)
Proceeds from mortgages sold	911,537	837,079
Origination of mortgages held for sale	(860,847)	(839,200)
Loss on other real estate owned, net	3,185	13,402
Increase in bank-owned life insurance	(3,895)	(2,535)
Decrease in prepaid pension asset	13,733	2,587
Decrease in prepaid deposit insurance assessments		8,985
Other, net	(32,664)	(1,809)
Net cash provided by operating activities	69,561	71,525
Investing activities:
Proceeds from calls and maturities of available-for-sale securities	247,705	266,829
Purchases of available-for-sale securities	(521,600)	(223,716)
Net (increase) decrease in loans and leases	(60,162)	89,060
Purchases of premises and equipment	(10,253)	(11,362)
Proceeds from sale of premises and equipment	3,181	968
Proceeds from sale of other real estate owned, net	23,174	35,563
Other, net	(6)	(16)
Net cash (used in) provided by investing activities	(317,961)	160,686
Proceeds from Sale of Available-for-sale Securities		3,360
Financing activities:
Net (decrease) increase in deposits	(126,528)	1,147
Net decrease in short-term debt and other liabilities	(31,747)	(11,950)
Issuance of common stock	225	108,678
Excess tax benefit from exercise of stock options	(19)
Payment of cash dividends	(1,890)	(1,888)
Net cash (used in) provided by financing activities	(159,959)	95,987
(Decrease) increase in cash and cash equivalents	(408,359)	328,198
Cash and cash equivalents at beginning of period	1,203,614	499,344
Cash and cash equivalents at end of period	$ 795,255	$ 827,542