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Consolidated statements of cash flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Cash flows from operating activities:      
Net income $ 83,856 $ 39,821 $ 55,980
Adjustments to reconcile net income to net cash provided by operating activities:      
Activities of derivative financial instruments and hedging 17,177 (6,498) 1,391
Depreciation and amortization of premises and equipment 2,166 2,510 2,671
Provision for loan losses 8,841 9,091 18,293
Reversal of provision for losses on off-balance sheet credit risk (4,448) (13,926) (3,463)
Impairment loss on assets 57   120
Net gain on sale of securities available-for-sale (3,413) (2,346) (546)
Compensation cost - compensation plans 2,311 2,099 1,596
Amortization of premium and discounts on investments 6,912 7,597 9,382
Net decrease (increase) in operating assets:      
Trading assets 29,766 (135) (5,338)
Investment fund 46,866 30,284 (46,880)
Accrued interest receivable (7,058) (5,549) 20,758
Other assets (7,507) (24,409) (5,126)
Net increase (decrease) in operating liabilities:      
Trading liabilities 1,647 786 (11,005)
Accrued interest payable 1,706 (1,207) (21,665)
Other liabilities 1,308 30,921 1,303
Net cash provided by operating activities 180,187 69,039 17,471
Cash flows from investing activities:      
Net decrease (increase) in pledged deposits (7,919) 6,507 52,422
Net increase in deposits with original maturities greater than three months (30,000)    
Net increase in loans (901,103) (1,308,935) (160,471)
Proceeds from the sale of loans 9,261 20,000  
Acquisition of premises and equipment (2,308) (1,293) (2,450)
Proceeds from the redemption of securities available-for-sale 19,484 33,074 50,509
Proceeds from the sale of securities available-for-sale 264,997 151,267 146,471
Proceeds from the maturity of securities held-to-maturity 13,500   28,275
Purchases of investments available-for-sale (364,993) (93,009) (9,994)
Purchases of investments held-to-maturity (7,050) (33,196)  
Net cash provided by (used in) investing activities (1,006,131) (1,225,585) 104,762
Cash flows from financing activities:      
Net increase in due to depositors 482,581 564,679 87,198
Net increase (decrease) in short-term borrowings and securities sold under repurchase agreements 340,141 961,195 (813,789)
Proceeds from borrowings and long-term debt 824,139 212,960 335,598
Repayments of borrowings and long-term debt (411,731) (528,207) (150,163)
Dividends paid (29,505) (22,720) (34,593)
Subscriptions of redeemable noncontrolling interest 531 9,900 32,090
Redemptions of redeemable noncontrolling interest (14,610) (23,427) (2,997)
Exercised stock options 4,101 834 808
Repurchase of common stock   (3)  
Net cash provided by (used in) financing activities 1,195,647 1,175,211 (545,848)
Effect of exchange rate fluctuations on cash and cash equivalents (852)    
Net increase (decrease) in cash and cash equivalents 368,851 18,665 (423,615)
Cash and cash equivalents at beginning of the year 420,639 401,974 825,589
Cash and cash equivalents at end of the year 789,490 420,639 401,974
Supplemental disclosures of cash flow information:      
Cash paid during the year for interest $ 53,011 $ 46,182 $ 98,877