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Consolidated Statements of Income (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Interest income: |  |  |
Loans, including fees | $ 268,588 | $ 292,514 | $ 314,202
Investment securities: |  |  |
Taxable | 94,885 | 113,650 | 135,106
Tax-exempt | 11,663 | 10,091 | 7,240
Other interest income | 503 | 1,869 | 2,221
Total interest income | 375,639 | 418,124 | 458,769
Interest expense: |  |  |
Savings and interest bearing demand deposits | 5,288 | 7,783 | 9,383
Time deposits | 23,973 | 31,556 | 46,967
Securities sold under repurchase agreements | 37,645 | 42,263 | 44,216
Other borrowings | 998 | 1,623 | 1,269
Junior subordinated deferrable interest debentures | 6,595 | 11,073 | 12,201
Total interest expense | 74,499 | 94,298 | 114,036
Net interest income | 301,140 | 323,826 | 344,733
Provision for probable loan losses | 27,959 | 17,318 | 22,812
Net interest income after provision for probable loan losses | 273,181 | 306,508 | 321,921
Non-interest income: |  |  |
Service charges on deposit accounts | 93,128 | 97,968 | 99,644
Other service charges, commissions and fees |  |  |
Banking | 38,523 | 50,686 | 47,930
Non-banking | 6,998 | 7,304 | 8,439
Investment securities transactions, net | 38,446 | 17,285 | 33,209
Other investments, net | 13,339 | 16,041 | 17,696
Other income | 10,157 | 12,209 | 11,866
Total non-interest income | 200,591 | 201,493 | 218,784
Non-interest expense: |  |  |
Employee compensation and benefits | 118,041 | 126,004 | 127,469
Occupancy | 34,608 | 38,722 | 36,631
Depreciation of bank premises and equipment | 26,756 | 34,935 | 35,395
Professional fees | 14,369 | 12,998 | 15,625
Deposit insurance assessments | 7,709 | 9,047 | 10,253
Net expense, other real estate owned | 8,929 | 14,817 | 6,055
Amortization of identified intangible assets | 4,651 | 5,293 | 5,284
Advertising | 7,017 | 5,807 | 7,716
Early termination fee - securities sold under repurchase agreements | 31,550 |  |
Litigation expense |  |  | 21,837
Impairment charges (Total other-than-temporary impairment charges, $(916) less gain of $(123), $(1,003) less loss of $26, and $(19,070) less loss of $10,654, included in other comprehensive income) | 1,039 | 977 | 8,416
Other | 60,703 | 68,174 | 65,044
Total non-interest expense | 315,372 | 316,774 | 339,725
Income before income taxes | 158,400 | 191,227 | 200,980
Provision for income taxes | 50,565 | 64,078 | 70,957
Net income | 107,835 | 127,149 | 130,023
Preferred stock dividends and discount accretion | 14,362 | 13,280 | 13,126
Net income available to common shareholders | $ 93,473 | $ 113,869 | $ 116,897
Basic earnings per common share: |  |  |
Weighted average number of shares outstanding (in shares) | 67,236,681 | 67,506,554 | 67,921,353
Net income (in dollars per share) | $ 1.39 | $ 1.69 | $ 1.72
Fully diluted earnings per common share: |  |  |
Weighted average number of shares outstanding (in shares) | 67,313,963 | 67,569,468 | 68,004,441
Net income (in dollars per share) | $ 1.39 | $ 1.69 | $ 1.72

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