CONDENSED 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
Interest and dividends received	$ 120,161	$ 135,863
Service charges and other fees received	18,130	18,983
Interest paid	(8,402)	(14,716)
Cash paid to vendors and employees	(38,837)	(58,934)
Income taxes paid	(38,200)	(3,000)
Proceeds from FDIC loss share agreement	312	6,276
Net cash provided by operating activities	53,164	84,472
CASH FLOWS FROM INVESTING ACTIVITIES
Proceeds from redemption of FHLB stock	11,435	6,875
Proceeds from sale of investment securities	99,155
Proceeds from repayment of investment securities	249,749	254,040
Proceeds from maturity of investment securities	25,867	65,652
Purchases of investment securities	(368,829)	(403,285)
Net decrease in loan and lease finance receivables	111,102	103,264
Proceeds from sales of premises and equipment	5	25
Purchase of premises and equipment	(1,541)	(2,913)
Proceeds from sales of other real estate owned	12,872	13,478
Net cash provided by investing activities	139,815	37,136
CASH FLOWS FROM FINANCING ACTIVITIES
Net increase in transaction deposits	69,142	169,280
Net decrease in time deposits	(10,807)	(74,978)
Repayment of junior subordinated debentures	(41,238)	(27,424)
Net decrease in other borrowings	(26,000)
Net increase/(decrease) in customer repurchase agreements	18,397	(41,734)
Cash dividends on common stock	(19,414)	(17,816)
Repurchase of common stock	(61)
Proceeds from exercise of stock options	780	2,240
Tax benefit related to exercise of stock options	59	176
Net cash (used in)/provided by financing activities	(9,142)	9,744
NET INCREASE IN CASH AND CASH EQUIVALENTS	183,837	131,352
CASH AND CASH EQUIVALENTS, beginning of period	98,431	345,343
CASH AND CASH EQUIVALENTS, end of period	282,268	476,695
RECONCILIATION OF NET EARNINGS TO NET CASH PROVIDED BY OPERATING ACTIVITIES
Net earnings	46,081	45,887
Adjustments to reconcile net earnings to net cash provided by operating activities:
Gain on sale of investment securities	(2,094)
Loss on sale of premises and equipment, net	6	6
Gain on sale of other real estate owned	(3,132)	(934)
Amortization of capitalized prepayment penalty on borrowings	136	136
Increase in bank owned life insurance	(1,370)	(1,490)
Net amortization of premiums and discounts on investment securities	13,938	11,123
Accretion of SJB discount	(7,849)	(12,213)
Provision for loan losses	(6,200)
Valuation adjustment on other real estate owned	87	318
Change in FDIC loss share asset	7,467	12,280
Proceeds from FDIC loss share agreement	312	6,276
Stock-based compensation	893	837
Depreciation and amortization, net	1,603	3,968
Change in accrued interest receivable	193	1,127
Change in accrued interest payable	(317)	(171)
Change in other assets and liabilities	3,283	17,201
Total adjustments	7,083	38,585
Net cash provided by operating activities	53,164	84,472
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING ACTIVITIES
Securities purchased and not settled	67,483	2,335
Transfer of loans to other real estate owned	$ 1,492	$ 3,003