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Securities (Tables) | 3 Months Ended
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Mar. 31, 2017
Investments, Debt and Equity Securities [Abstract] |
Amortized Cost and Estimated Fair Value of Securities, Excluding Trading Securities | A summary of the amortized cost and estimated fair value of securities, excluding trading securities, is presented below.
| March 31, 2017 |  | December 31, 2016
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
Held to Maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 249,889 |  |  | $ | 1,762 |  |  | $ | — |  |  | $ | 251,651 |
Residential mortgage-backed securities | 4,313 |  |  | 30 |  |  | — |  |  | 4,343 |  |  | 4,511 |  |  | 39 |  |  | — |  |  | 4,550 |
States and political subdivisions | 1,634,592 |  |  | 27,531 |  |  | 3,039 |  |  | 1,659,084 |  |  | 1,994,710 |  |  | 16,821 |  |  | 6,335 |  |  | 2,005,196 |
Other | 1,350 |  |  | — |  |  | 4 |  |  | 1,346 |  |  | 1,350 |  |  | — |  |  | — |  |  | 1,350 |
Total | $ | 1,640,255 |  |  | $ | 27,561 |  |  | $ | 3,043 |  |  | $ | 1,664,773 |  |  | $ | 2,250,460 |  |  | $ | 18,622 |  |  | $ | 6,335 |  |  | $ | 2,262,747 |
Available for Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury | $ | 4,203,543 |  |  | $ | 25,386 |  |  | $ | 7,698 |  |  | $ | 4,221,231 |  |  | $ | 4,003,692 |  |  | $ | 24,984 |  |  | $ | 8,945 |  |  | $ | 4,019,731 |
Residential mortgage-backed securities | 711,040 |  |  | 27,305 |  |  | 1,426 |  |  | 736,919 |  |  | 756,072 |  |  | 30,388 |  |  | 1,293 |  |  | 785,167 |
States and political subdivisions | 5,624,493 |  |  | 70,205 |  |  | 82,860 |  |  | 5,611,838 |  |  | 5,403,918 |  |  | 50,101 |  |  | 98,134 |  |  | 5,355,885 |
Other | 42,505 |  |  | — |  |  | — |  |  | 42,505 |  |  | 42,494 |  |  | — |  |  | — |  |  | 42,494 |
Total | $ | 10,581,581 |  |  | $ | 122,896 |  |  | $ | 91,984 |  |  | $ | 10,612,493 |  |  | $ | 10,206,176 |  |  | $ | 105,473 |  |  | $ | 108,372 |  |  | $ | 10,203,277 |
Securities, with Unrealized Losses Segregated by Length of Impairment | As of March 31, 2017, securities with unrealized losses, segregated by length of impairment, were as follows:
| Less than 12 Months |  | More than 12 Months |  | Total
| Estimated Fair Value |  | Unrealized Losses |  | Estimated Fair Value |  | Unrealized Losses |  | Estimated Fair Value |  | Unrealized Losses
Held to Maturity |  |  |  |  |  |  |  |  |  |  |
States and political subdivisions | $ | 27,969 |  |  | $ | 249 |  |  | $ | 120,214 |  |  | $ | 2,790 |  |  | $ | 148,183 |  |  | $ | 3,039 |
Other | 1,346 |  |  | 4 |  |  | — |  |  | — |  |  | 1,346 |  |  | 4 |
Total | $ | 29,315 |  |  | $ | 253 |  |  | $ | 120,214 |  |  | $ | 2,790 |  |  | $ | 149,529 |  |  | $ | 3,043 |
Available for Sale |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury | $ | 1,621,498 |  |  | $ | 7,698 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,621,498 |  |  | $ | 7,698 |
Residential mortgage-backed securities | 61,669 |  |  | 1,166 |  |  | $ | 6,200 |  |  | 260 |  |  | 67,869 |  |  | 1,426 |
States and political subdivisions | 2,182,114 |  |  | 82,860 |  |  | — |  |  | — |  |  | 2,182,114 |  |  | 82,860 |
Total | $ | 3,865,281 |  |  | $ | 91,724 |  |  | $ | 6,200 |  |  | $ | 260 |  |  | $ | 3,871,481 |  |  | $ | 91,984 |
Amortized Cost and Estimated Fair Value of Securities, Excluding Trading Securities, Presented by Contractual Maturity | The amortized cost and estimated fair value of securities, excluding trading securities, at March 31, 2017 are presented below by contractual maturity. Expected maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations. Residential mortgage-backed securities and equity securities are shown separately since they are not due at a single maturity date.
| Held to Maturity |  | Available for Sale
| Amortized Cost |  | Estimated Fair Value |  | Amortized Cost |  | Estimated Fair Value
Due in one year or less | $ | 327,143 |  |  | $ | 335,353 |  |  | $ | 50,830 |  |  | $ | 51,606 |
Due after one year through five years | 166,880 |  |  | 174,676 |  |  | 4,793,171 |  |  | 4,819,082 |
Due after five years through ten years | 349,195 |  |  | 353,119 |  |  | 366,528 |  |  | 376,888 |
Due after ten years | 792,724 |  |  | 797,282 |  |  | 4,617,507 |  |  | 4,585,493 |
Residential mortgage-backed securities | 4,313 |  |  | 4,343 |  |  | 711,040 |  |  | 736,919 |
Equity securities | — |  |  | — |  |  | 42,505 |  |  | 42,505 |
Total | $ | 1,640,255 |  |  | $ | 1,664,773 |  |  | $ | 10,581,581 |  |  | $ | 10,612,493 |
Sales of Securities Held-to-Maturity | Sales of securities held to maturity were as follows:
| Three Months Ended March 31,
| 2017 |  | 2016
Proceeds from sales | $ | — |  |  | $ | 135,610 |
Amortized cost | — |  |  | 131,840 |
Gross realized gains | — |  |  | 3,770 |
Gross realized losses | — |  |  | — |
Tax (expense) benefit of securities gains/losses | — |  |  | (1,319 | )
Sales of Securities Available for Sale | Sales of securities available for sale were as follows:
| Three Months Ended March 31,
| 2017 |  | 2016
Proceeds from sales | $ | — |  |  | $ | 1,060,196 |
Gross realized gains | — |  |  | 11,133 |
Gross realized losses | — |  |  | — |
Tax (expense) benefit of securities gains/losses | — |  |  | (3,897 | )
Premium Amortization and Discount Accretion Included in Income on Securities [Table Text Block] | Premium amortization and discount accretion included in interest income on securities was as follows:
| Three Months Ended March 31,
| 2017 |  | 2016
Premium amortization | $ | (24,028 | ) |  | $ | (22,340 | )
Discount accretion | 2,390 |  |  | 2,615 |
Net (premium amortization) discount accretion | $ | (21,638 | ) |  | $ | (19,725 | )
Trading Account Securities, at Estimated Fair Value | Trading account securities, at estimated fair value, were as follows:
| March 31, 2017 |  | December 31, 2016
U.S. Treasury | $ | 17,094 |  |  | $ | 16,594 |
States and political subdivisions | — |  |  | 109 |
Total | $ | 17,094 |  |  | $ | 16,703 |
Net Gains and Losses on Trading Account Securities | Net gains and losses on trading account securities were as follows:
| Three Months Ended March 31,
| 2017 |  | 2016
Net gain on sales transactions | $ | 311 |  |  | $ | 302 |
Net mark-to-market gains (losses) | 13 |  |  | 1 |
Net gain (loss) on trading account securities | $ | 324 |  |  | $ | 303 |

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- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27198-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27357-111563 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563 + Details
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