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INVESTMENT SECURITIES (Tables) | 12 Months Ended
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Dec. 31, 2014
INVESTMENT SECURITIES [Abstract] |
Amortized Cost and Estimated Fair Value of Investment Securities | The amortized cost and estimated fair value of investment securities as of December 31 are as follows:
|  | 2014 |  |  | 2013 |
|  |  |  |  | Gross |  |  | Gross |  |  | Estimated |  |  |  |  |  | Gross |  |  | Gross |  |  | Estimated |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |  |  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
(000's omitted) |  | Cost |  |  | Gains |  |  | Losses |  |  | Value |  |  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
Available-for-Sale Portfolio: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and agency securities |  | $ | 1,479,134 |  |  | $ | 39,509 |  |  | $ | 910 |  |  | $ | 1,517,733 |  |  | $ | 1,252,332 |  |  | $ | 1,119 |  |  | $ | 41,304 |  |  | $ | 1,212,147 |
Obligations of state and political subdivisions |  |  | 645,398 |  |  |  | 26,749 |  |  |  | 244 |  |  |  | 671,903 |  |  |  | 665,441 |  |  |  | 15,919 |  |  |  | 12,378 |  |  |  | 668,982 |
Government agency mortgage-backed securities |  |  | 228,971 |  |  |  | 9,782 |  |  |  | 1,025 |  |  |  | 237,728 |  |  |  | 250,431 |  |  |  | 8,660 |  |  |  | 4,113 |  |  |  | 254,978 |
Corporate debt securities |  |  | 26,803 |  |  |  | 363 |  |  |  | 75 |  |  |  | 27,091 |  |  |  | 26,932 |  |  |  | 873 |  |  |  | 218 |  |  |  | 27,587 |
Government agency collateralized mortgage obligations |  |  | 17,330 |  |  |  | 695 |  |  |  | 0 |  |  |  | 18,025 |  |  |  | 21,779 |  |  |  | 362 |  |  |  | 93 |  |  |  | 22,048 |
Marketable equity securities |  |  | 250 |  |  |  | 195 |  |  |  | 0 |  |  |  | 445 |  |  |  | 250 |  |  |  | 171 |  |  |  | 0 |  |  |  | 421 |
Total available-for-sale portfolio |  | $ | 2,397,886 |  |  | $ | 77,293 |  |  | $ | 2,254 |  |  | $ | 2,472,925 |  |  | $ | 2,217,165 |  |  | $ | 27,104 |  |  | $ | 58,106 |  |  | $ | 2,186,163 |
Other Securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Federal Home Loan Bank common stock |  | $ | 19,553 |  |  |  |  |  |  |  |  |  |  | $ | 19,553 |  |  | $ | 12,053 |  |  |  |  |  |  |  |  |  |  | $ | 12,053 |
Federal Reserve Bank common stock |  |  | 16,050 |  |  |  |  |  |  |  |  |  |  |  | 16,050 |  |  |  | 16,050 |  |  |  |  |  |  |  |  |  |  |  | 16,050 |
Other equity securities |  |  | 4,446 |  |  |  |  |  |  |  |  |  |  |  | 4,446 |  |  |  | 4,459 |  |  |  |  |  |  |  |  |  |  |  | 4,459 |
Total other securities |  | $ | 40,049 |  |  |  |  |  |  |  |  |  |  | $ | 40,049 |  |  | $ | 32,562 |  |  |  |  |  |  |  |  |  |  | $ | 32,562 |
Summary of Investment Securities That Have Been in a Continuous Unrealized Loss Position for Less Than or Greater Than Twelve Months | A summary of investment securities that have been in a continuous unrealized loss position for less than or greater than twelve months is as follows: As of December 31, 2014
|  |  |  |  | Less than 12 Months |  |  |  |  |  | 12 Months or Longer |  |  |  |  |  | Total |
|  |  |  |  |  |  |  | Gross |  |  |  |  |  |  |  |  | Gross |  |  |  |  |  |  |  |  | Gross |
|  |  |  |  | Fair |  |  | Unrealized |  |  |  |  |  | Fair |  |  | Unrealized |  |  |  |  |  | Fair |  |  | Unrealized |
(000's omitted) |  |  | # |  |  | Value |  |  | Losses |  |  |  | # |  |  | Value |  |  | Losses |  |  |  | # |  |  | Value |  |  | Losses |
Available-for-Sale Portfolio: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and agency obligations |  |  | 0 |  |  | $ | 0 |  |  | $ | 0 |  |  |  | 4 |  |  | $ | 102,363 |  |  | $ | 910 |  |  |  | 4 |  |  | $ | 102,363 |  |  | $ | 910 |
Obligations of state and political subdivisions |  |  | 23 |  |  |  | 13,413 |  |  |  | 34 |  |  |  | 46 |  |  |  | 26,490 |  |  |  | 210 |  |  |  | 69 |  |  |  | 39,903 |  |  |  | 244 |
Government agency mortgage-backed securities |  |  | 3 |  |  |  | 5 |  |  |  | 0 |  |  |  | 19 |  |  |  | 34,770 |  |  |  | 1,025 |  |  |  | 22 |  |  |  | 34,775 |  |  |  | 1,025 |
Corporate debt securities |  |  | 1 |  |  |  | 3,040 |  |  |  | 1 |  |  |  | 1 |  |  |  | 2,755 |  |  |  | 74 |  |  |  | 2 |  |  |  | 5,795 |  |  |  | 75 |
Government agency collateralized mortgage obligations |  |  | 1 |  |  |  | 0 |  |  |  | 0 |  |  |  | 1 |  |  |  | 5 |  |  |  | 0 |  |  |  | 2 |  |  |  | 5 |  |  |  | 0 |
Total available-for-sale/investment portfolio |  |  | 28 |  |  | $ | 16,458 |  |  | $ | 35 |  |  |  | 71 |  |  | $ | 166,383 |  |  | $ | 2,219 |  |  |  | 99 |  |  | $ | 182,841 |  |  | $ | 2,254 |
As of December 31, 2013
|  |  |  |  | Less than 12 Months |  |  |  |  |  |  |  |  | 12 Months or Longer |  |  |  |  |  |  |  |  | Total |
|  |  |  |  |  |  |  | Gross |  |  |  |  |  |  |  |  | Gross |  |  |  |  |  |  |  |  | Gross |
|  |  |  |  | Fair |  |  | Unrealized |  |  |  |  |  | Fair |  |  | Unrealized |  |  |  |  |  | Fair |  |  | Unrealized |
(000's omitted) |  |  | # |  |  | Value |  |  | Losses |  |  |  | # |  |  | Value |  |  | Losses |  |  |  | # |  |  | Value |  |  | Losses |
Available-for-Sale Portfolio: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and agency obligations |  |  | 43 |  |  | $ | 1,181,214 |  |  | $ | 41,304 |  |  |  | 0 |  |  | $ | 0 |  |  | $ | 0 |  |  |  | 43 |  |  | $ | 1,181,214 |  |  | $ | 41,304 |
Obligations of state and political subdivisions |  |  | 302 |  |  |  | 195,526 |  |  |  | 11,774 |  |  |  | 9 |  |  |  | 4,974 |  |  |  | 604 |  |  |  | 311 |  |  |  | 200,500 |  |  |  | 12,378 |
Government agency mortgage-backed securities |  |  | 43 |  |  |  | 68,917 |  |  |  | 3,262 |  |  |  | 6 |  |  |  | 8,713 |  |  |  | 851 |  |  |  | 49 |  |  |  | 77,630 |  |  |  | 4,113 |
Corporate debt securities |  |  | 1 |  |  |  | 3,026 |  |  |  | 31 |  |  |  | 1 |  |  |  | 2,703 |  |  |  | 187 |  |  |  | 2 |  |  |  | 5,729 |  |  |  | 218 |
Government agency collateralized mortgage obligations |  |  | 1 |  |  |  | 2,601 |  |  |  | 93 |  |  |  | 1 |  |  |  | 7 |  |  |  | 0 |  |  |  | 2 |  |  |  | 2,608 |  |  |  | 93 |
Total available-for-sale/investment portfolio |  |  | 390 |  |  | $ | 1,451,284 |  |  | $ | 56,464 |  |  |  | 17 |  |  | $ | 16,397 |  |  | $ | 1,642 |  |  |  | 407 |  |  | $ | 1,467,681 |  |  | $ | 58,106 |
Amortized Cost and Estimated Fair Value of Debt Securities by Contractual Maturity | The amortized cost and estimated fair value of debt securities at December 31, 2014, by contractual maturity, are shown below. Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. Securities not due at a single maturity date are shown separately.
|  | Available-for-Sale |
|  | Amortized |  |  | Fair |
(000's omitted) |  | Cost |  |  | Value |
Due in one year or less |  | $ | 59,386 |  |  | $ | 60,045 |
Due after one through five years |  |  | 146,559 |  |  |  | 150,631 |
Due after five years through ten years |  |  | 1,698,124 |  |  |  | 1,746,688 |
Due after ten years |  |  | 247,266 |  |  |  | 259,363 |
Subtotal |  |  | 2,151,335 |  |  |  | 2,216,727 |
Government agency mortgage-backed securities |  |  | 228,971 |  |  |  | 237,728 |
Government agency collateralized mortgage obligations |  |  | 17,330 |  |  |  | 18,025 |
Total |  | $ | 2,397,636 |  |  | $ | 2,472,480 |
Cash Flow Information on Investment Securities | Cash flow information on investment securities for the years ended December 31 is as follows:
(000's omitted) |  | 2014 |  |  | 2013 |  |  | 2012 |
Gross gains on sales of investment securities |  | $ | 0 |  |  | $ | 96,258 |  |  | $ | 350 |
Gross losses on sales of investment securities |  |  | 0 |  |  |  | 15,490 |  |  |  | 59 |
Proceeds from the maturities of mortgage-backed securities and CMO's |  |  | 46,791 |  |  |  | 83,232 |  |  |  | 109,843 |
Purchases of mortgage-backed securities and CMO's |  |  | 22,234 |  |  |  | 51,194 |  |  |  | 26,292 |

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