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AFS Securities (Tables) | 6 Months Ended
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Jun. 30, 2018
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:
| June 30, 2018
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Government sponsored enterprises | $ | 194 |  |  | $ | — |  |  | $ | 4 |  |  | $ | 190 |
States and political subdivisions | 200,976 |  |  | 1,857 |  |  | 560 |  |  | 202,273 |
Auction rate money market preferred | 3,200 |  |  | — |  |  | 65 |  |  | 3,135 |
Mortgage-backed securities | 204,411 |  |  | 41 |  |  | 6,815 |  |  | 197,637 |
Collateralized mortgage obligations | 124,544 |  |  | 50 |  |  | 3,721 |  |  | 120,873 |
Total | $ | 533,325 |  |  | $ | 1,948 |  |  | $ | 11,165 |  |  | $ | 524,108 |
| December 31, 2017
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Government sponsored enterprises | $ | 217 |  |  | $ | — |  |  | $ | 1 |  |  | $ | 216 |
States and political subdivisions | 204,131 |  |  | 4,486 |  |  | 143 |  |  | 208,474 |
Auction rate money market preferred | 3,200 |  |  | — |  |  | 151 |  |  | 3,049 |
Mortgage-backed securities | 210,757 |  |  | 390 |  |  | 2,350 |  |  | 208,797 |
Collateralized mortgage obligations | 129,607 |  |  | 160 |  |  | 1,573 |  |  | 128,194 |
Total | $ | 547,912 |  |  | $ | 5,036 |  |  | $ | 4,218 |  |  | $ | 548,730 |
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 June 30, 2018 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 | $ | — |  |  | $ | 194 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 194 |
States and political subdivisions | 27,593 |  |  | 81,665 |  |  | 62,446 |  |  | 29,272 |  |  | — |  |  | 200,976 |
Auction rate money market preferred | — |  |  | — |  |  | — |  |  | — |  |  | 3,200 |  |  | 3,200 |
Mortgage-backed securities | — |  |  | — |  |  | — |  |  | — |  |  | 204,411 |  |  | 204,411 |
Collateralized mortgage obligations | — |  |  | — |  |  | — |  |  | — |  |  | 124,544 |  |  | 124,544 |
Total amortized cost | $ | 27,593 |  |  | $ | 81,859 |  |  | $ | 62,446 |  |  | $ | 29,272 |  |  | $ | 332,155 |  |  | $ | 533,325 |
Fair value | $ | 27,640 |  |  | $ | 82,336 |  |  | $ | 63,199 |  |  | $ | 29,288 |  |  | $ | 321,645 |  |  | $ | 524,108 |
Schedule of Realized Gain (Loss) [Table Text Block] | A summary of the sales activity of AFS securities was as follows for the:
| Three Months Ended June 30 |  | Six Months Ended June 30
| 2018 |  | 2017 |  | 2018 |  | 2017
Proceeds from sales of AFS securities | $ | — |  |  | $ | 12,827 |  |  | $ | — |  |  | $ | 12,827 |
Gross realized gains (losses) | $ | — |  |  | $ | 142 |  |  | $ | — |  |  | $ | 142 |
Applicable income tax expense (benefit) | $ | — |  |  | $ | 48 |  |  | $ | — |  |  | $ | 48 |
Available-for-sale securities with gross unrealized losses | The following information pertains to AFS securities with gross unrealized losses at June 30, 2018 and December 31, 2017, aggregated by investment category and length of time that individual securities have been in a continuous loss position.
| June 30, 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 | $ | 4 |  |  | $ | 190 |  |  | $ | — |  |  | $ | — |  |  | $ | 4 |
States and political subdivisions | 378 |  |  | 32,949 |  |  | 182 |  |  | 9,012 |  |  | 560 |
Auction rate money market preferred | — |  |  | — |  |  | 65 |  |  | 3,135 |  |  | 65 |
Mortgage-backed securities | 3,265 |  |  | 125,130 |  |  | 3,550 |  |  | 69,214 |  |  | 6,815 |
Collateralized mortgage obligations | 2,490 |  |  | 94,355 |  |  | 1,231 |  |  | 22,523 |  |  | 3,721 |
Total | $ | 6,137 |  |  | $ | 252,624 |  |  | $ | 5,028 |  |  | $ | 103,884 |  |  | $ | 11,165 |
Number of securities in an unrealized loss position: |  |  | 159 |  |  |  |  | 91 |  |  | 250 |
| December 31, 2017
| 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 |  |  | $ | 216 |  |  | $ | — |  |  | $ | — |  |  | $ | 1 |
States and political subdivisions | 142 |  |  | 16,139 |  |  | 1 |  |  | 188 |  |  | 143 |
Auction rate money market preferred | — |  |  | — |  |  | 151 |  |  | 3,049 |  |  | 151 |
Mortgage-backed securities | 454 |  |  | 72,007 |  |  | 1,896 |  |  | 76,065 |  |  | 2,350 |
Collateralized mortgage obligations | 701 |  |  | 76,435 |  |  | 872 |  |  | 25,308 |  |  | 1,573 |
Total | $ | 1,298 |  |  | $ | 164,797 |  |  | $ | 2,920 |  |  | $ | 104,610 |  |  | $ | 4,218 |
Number of securities in an unrealized loss position: |  |  | 81 |  |  |  |  | 24 |  |  | 105 |

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- Definition Tabular disclosure of the proceeds from sales of available-for-sale securities and the gross realized gains and gross realized losses that have been included in earnings as a result of those sales. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 + Details
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