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CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Operating activities:    
Net income $ 63,352 $ 58,264
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation 9,058 8,487
Amortization of intangible assets 3,408 3,343
Net accretion of premiums and discounts on securities and borrowings (4,081) (4,167)
Stock-based compensation 3,014 2,855
Provision for loan losses 4,807 6,442
Amortization of mortgage servicing rights 409 536
Income from bank-owned life insurance policies (775) (833)
Gain on sales of investment securities (63,799) (291)
Loss on debt extinguishments 63,500 0
Net loss/(gain) from sale of loans and other assets 248 229
Net change in loans held for sale (913) 488
Change in other assets and liabilities (6,297) 12,815
Net cash provided by operating activities 71,931 88,168
Investing activities:    
Proceeds from sales of available-for-sale investment securities 711,540 5,378
Proceeds from maturities of available-for-sale investment securities 158,849 144,958
Proceeds from maturities of held-to-maturity investment securities 27,074 20,517
Proceeds from sale of other investment securities 7,229 275
Purchases of available-for-sale investment securities (666,841) (745,074)
Purchases of held-to-maturity investment securities (5,298) (107,317)
Purchases of other securities (2) (14)
Net increase in loans (163,491) (187,154)
Cash received from acquisition, net of cash paid of $0 and $0 0 600,972
Purchases of premises and equipment, net (11,226) (7,103)
Net cash provided by (used in) investing activities 57,834 (274,562)
Financing activities:    
Net increase in deposits 59,294 115,422
Net change in borrowings, net of payments of $565,145 and $165 (224,445) (165)
Issuance of common stock 12,072 63,083
Cash dividends paid (32,222) (30,084)
Tax benefits from share-based payment arrangements 1,183 1,013
Net cash (used in) provided by financing activities (184,118) 149,269
Change in cash and cash equivalents (54,353) (37,125)
Cash and cash equivalents at beginning of period 228,558 324,878
Cash and cash equivalents at end of period 174,205 287,753
Supplemental disclosures of cash flow information:    
Cash paid for interest 23,935 39,355
Cash paid for income taxes 19,328 16,217
Supplemental disclosures of noncash financing and investing activities:    
Dividends declared and unpaid 11,279 10,682
Transfers from loans to other real estate 5,024 2,571
Acquisitions:    
Fair value of assets acquired, excluding acquired cash and intangibles 0 165,885
Fair value of liabilities assumed $ 0 $ 798,031