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AFS Securities (Tables) | 3 Months Ended
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Mar. 31, 2019
Investments, Debt and Equity Securities [Abstract] |
Amortized cost and fair value of available-for-sale securities | The amortized cost and fair value of AFS securities, with gross unrealized gains and losses, are as follows at:
| March 31, 2019
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Government sponsored enterprises | $ | 166 |  |  | $ | — |  |  | $ | 1 |  |  | $ | 165 |
States and political subdivisions | 187,716 |  |  | 3,566 |  |  | 16 |  |  | 191,266 |
Auction rate money market preferred | 3,200 |  |  | — |  |  | 381 |  |  | 2,819 |
Mortgage-backed securities | 183,695 |  |  | 286 |  |  | 2,843 |  |  | 181,138 |
Collateralized mortgage obligations | 120,522 |  |  | 211 |  |  | 1,279 |  |  | 119,454 |
Total | $ | 495,299 |  |  | $ | 4,063 |  |  | $ | 4,520 |  |  | $ | 494,842 |
| December 31, 2018
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Government sponsored enterprises | $ | 172 |  |  | $ | — |  |  | $ | 2 |  |  | $ | 170 |
States and political subdivisions | 188,992 |  |  | 2,125 |  |  | 251 |  |  | 190,866 |
Auction rate money market preferred | 3,200 |  |  | — |  |  | 646 |  |  | 2,554 |
Mortgage-backed securities | 189,688 |  |  | 76 |  |  | 5,280 |  |  | 184,484 |
Collateralized mortgage obligations | 119,193 |  |  | 71 |  |  | 2,504 |  |  | 116,760 |
Total | $ | 501,245 |  |  | $ | 2,272 |  |  | $ | 8,683 |  |  | $ | 494,834 |
Amortized cost and fair value of available-for-sale securities by contractual maturity | The amortized cost and fair value of AFS securities by contractual maturity at March 31, 2019 are as follows:
| Maturing |  | Securities with Variable Monthly Payments or Noncontractual Maturities |  |
| Due in One Year or Less |  | After One Year But Within Five Years |  | After Five Years But Within Ten Years |  | After Ten Years |  |  | Total
Government sponsored enterprises | $ | — |  |  | $ | 166 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 166 |
States and political subdivisions | 25,276 |  |  | 79,254 |  |  | 53,636 |  |  | 29,550 |  |  | — |  |  | 187,716 |
Auction rate money market preferred | — |  |  | — |  |  | — |  |  | — |  |  | 3,200 |  |  | 3,200 |
Mortgage-backed securities | — |  |  | — |  |  | — |  |  | — |  |  | 183,695 |  |  | 183,695 |
Collateralized mortgage obligations | — |  |  | — |  |  | — |  |  | — |  |  | 120,522 |  |  | 120,522 |
Total amortized cost | $ | 25,276 |  |  | $ | 79,420 |  |  | $ | 53,636 |  |  | $ | 29,550 |  |  | $ | 307,417 |  |  | $ | 495,299 |
Fair value | $ | 25,320 |  |  | $ | 80,561 |  |  | $ | 55,029 |  |  | $ | 30,521 |  |  | $ | 303,411 |  |  | $ | 494,842 |
Available-for-sale securities with gross unrealized losses | The following information pertains to AFS securities with gross unrealized losses at March 31, 2019 and December 31, 2018, aggregated by investment category and length of time that individual securities have been in a continuous loss position.
| March 31, 2019
| Less Than Twelve Months |  | Twelve Months or More |  |
| Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Total Unrealized Losses
Government sponsored enterprises | $ | — |  |  | $ | — |  |  | $ | 1 |  |  | $ | 165 |  |  | $ | 1 |
States and political subdivisions | — |  |  | — |  |  | 16 |  |  | 6,838 |  |  | 16 |
Auction rate money market preferred | — |  |  | — |  |  | 381 |  |  | 2,819 |  |  | 381 |
Mortgage-backed securities | — |  |  | — |  |  | 2,843 |  |  | 163,726 |  |  | 2,843 |
Collateralized mortgage obligations | — |  |  | 132 |  |  | 1,279 |  |  | 97,674 |  |  | 1,279 |
Total | $ | — |  |  | $ | 132 |  |  | $ | 4,520 |  |  | $ | 271,222 |  |  | $ | 4,520 |
Number of securities in an unrealized loss position: |  |  | 1 |  |  |  |  | 100 |  |  | 101 |
| December 31, 2018
| Less Than Twelve Months |  | Twelve Months or More |  |
| Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Total Unrealized Losses
Government sponsored enterprises | $ | — |  |  | $ | — |  |  | $ | 2 |  |  | $ | 170 |  |  | $ | 2 |
States and political subdivisions | 83 |  |  | 14,732 |  |  | 168 |  |  | 15,090 |  |  | 251 |
Auction rate money market preferred | — |  |  | — |  |  | 646 |  |  | 2,554 |  |  | 646 |
Mortgage-backed securities | 896 |  |  | 43,485 |  |  | 4,384 |  |  | 124,253 |  |  | 5,280 |
Collateralized mortgage obligations | 199 |  |  | 21,886 |  |  | 2,305 |  |  | 87,929 |  |  | 2,504 |
Total | $ | 1,178 |  |  | $ | 80,103 |  |  | $ | 7,505 |  |  | $ | 229,996 |  |  | $ | 8,683 |
Number of securities in an unrealized loss position: |  |  | 66 |  |  |  |  | 102 |  |  | 168 |

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