UNAUDITED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
ASSETS
Investment securities held-to-maturity, Fair value	$ 936,088	$ 452,202
Allowance for loan losses	$ 93,252	$ 96,367
SHAREHOLDERS' EQUITY
Common Stock, no par value (in dollars per share)	$ 0.00	$ 0.00
Common stock, authorized (in shares)	250,000,000	250,000,000
Common stock, issued (in shares)	152,275,706	152,310,162
Treasury stock (in shares)	13,130,037	6,511,411