Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Assets
Cash and due from banks	$ 161,657	$ 153,747
Short-term investments and interest bearing deposits	620,306	516,938
Securities available-for-sale (amortized cost of $1,617,014 in 2014 and $1,637,965 in 2013)	1,578,897	1,586,668
Trading securities		4,936
Loans	8,302,282	8,084,563
Less: Allowance for loan losses	(169,138)	(173,889)
Unamortized deferred loan fees, net	(12,936)	(13,487)
Loans, net	8,120,208	7,897,187
Federal Home Loan Bank stock	29,901	25,000
Other real estate owned, net	44,853	52,985
Affordable housing investments, net	89,303	84,108
Premises and equipment, net	102,340	102,045
Customers’ liability on acceptances	23,677	32,194
Accrued interest receivable	25,237	24,274
Goodwill	316,340	316,340
Other intangible assets, net	2,051	2,230
Other assets	176,418	190,634
Total assets	11,291,188	10,989,286
Deposits
Non-interest-bearing demand deposits	1,488,720	1,441,858
Interest-bearing deposits:
NOW deposits	692,925	683,873
Money market deposits	1,261,419	1,286,338
Savings deposits	523,950	499,520
Time deposits under $100,000	1,076,329	931,204
Time deposits of $100,000 or more	3,189,282	3,138,512
Total deposits	8,232,625	7,981,305
Securities sold under agreements to repurchase	700,000	800,000
Advances from the Federal Home Loan Bank	636,200	521,200
Other borrowings for affordable housing investments	19,025	19,062
Long-term debt	121,136	121,136
Acceptances outstanding	23,677	32,194
Other liabilities	64,124	55,418
Total liabilities	9,796,787	9,530,315
Commitments and contingencies	0	0
Stockholders’ Equity
Common stock, $0.01 par value, 100,000,000 shares authorized, 83,827,123 issued and 79,619,558 outstanding at March 31, 2014, and 83,797,434 issued and 79,589,869 outstanding at December 31, 2013	838	838
Additional paid-in-capital	785,001	784,489
Accumulated other comprehensive loss, net	(22,090)	(29,729)
Retained earnings	856,388	829,109
Treasury stock, at cost (4,207,565 shares at March 31, 2014, and at December 31, 2013)	(125,736)	(125,736)
Total equity	1,494,401	1,458,971
Total liabilities and equity	$ 11,291,188	$ 10,989,286