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AFS Securities (Tables) | 3 Months Ended
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Mar. 31, 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:
| March 31, 2018
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Government sponsored enterprises | $ | 205 |  |  | $ | — |  |  | $ | 3 |  |  | $ | 202 |
States and political subdivisions | 209,788 |  |  | 2,240 |  |  | 395 |  |  | 211,633 |
Auction rate money market preferred | 3,200 |  |  | — |  |  | 188 |  |  | 3,012 |
Mortgage-backed securities | 212,713 |  |  | 103 |  |  | 5,955 |  |  | 206,861 |
Collateralized mortgage obligations | 129,095 |  |  | 73 |  |  | 3,114 |  |  | 126,054 |
Total | $ | 555,001 |  |  | $ | 2,416 |  |  | $ | 9,655 |  |  | $ | 547,762 |
| 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 March 31, 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 | $ | — |  |  | $ | 205 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 205 |
States and political subdivisions | 24,933 |  |  | 79,352 |  |  | 71,772 |  |  | 33,731 |  |  | — |  |  | 209,788 |
Auction rate money market preferred | — |  |  | — |  |  | — |  |  | — |  |  | 3,200 |  |  | 3,200 |
Mortgage-backed securities | — |  |  | — |  |  | — |  |  | — |  |  | 212,713 |  |  | 212,713 |
Collateralized mortgage obligations | — |  |  | — |  |  | — |  |  | — |  |  | 129,095 |  |  | 129,095 |
Total amortized cost | $ | 24,933 |  |  | $ | 79,557 |  |  | $ | 71,772 |  |  | $ | 33,731 |  |  | $ | 345,008 |  |  | $ | 555,001 |
Fair value | $ | 24,968 |  |  | $ | 80,351 |  |  | $ | 72,692 |  |  | $ | 33,824 |  |  | $ | 335,927 |  |  | $ | 547,762 |
Available-for-sale securities with gross unrealized losses | The following information pertains to AFS securities with gross unrealized losses at March 31, 2018 and December 31, 2017, aggregated by investment category and length of time that individual securities have been in a continuous loss position.
| March 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 | $ | 3 |  |  | $ | 202 |  |  | $ | — |  |  | $ | — |  |  | $ | 3 |
States and political subdivisions | 395 |  |  | 32,838 |  |  | — |  |  | 150 |  |  | 395 |
Auction rate money market preferred | — |  |  | — |  |  | 188 |  |  | 3,012 |  |  | 188 |
Mortgage-backed securities | 2,756 |  |  | 121,210 |  |  | 3,199 |  |  | 71,928 |  |  | 5,955 |
Collateralized mortgage obligations | 1,998 |  |  | 96,415 |  |  | 1,116 |  |  | 23,922 |  |  | 3,114 |
Total | $ | 5,152 |  |  | $ | 250,665 |  |  | $ | 4,503 |  |  | $ | 99,012 |  |  | $ | 9,655 |
Number of securities in an unrealized loss position: |  |  | 151 |  |  |  |  | 24 |  |  | 175 |
| 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 |
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Table Text Block] | The following table provides a roll-forward of credit related impairment recorded in earnings for the:
| Three Months Ended March 31
| 2018 |  | 2017
Balance at beginning of the period | $ | 770 |  |  | $ | 770 |
Additions to credit losses for which no previous OTTI was recognized | — |  |  | — |
Reductions for credit losses realized on securities sold during the period | — |  |  | — |
Balance at end of the period | $ | 770 |  |  | $ | 770 |

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- Definition Tabular disclosure of fair value of investments in debt and equity securities in an unrealized loss position categorized neither as held-to-maturity nor trading securities. + References No definition available. + Details
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- Definition Tabular disclosure of the amount of other than temporary impairment (OTTI) related to credit losses recognized in earnings including: (a) the beginning balance of the amount related to credit losses on debt securities held by the investor at the beginning of the period for which a portion of an OTTI was recognized in other comprehensive income; (b) additions for the amount related to the credit loss for which an OTTI was not previously recognized; (c) reductions for securities sold during the period (realized); (d) reductions for securities for which the amount previously recognized in other comprehensive income was recognized in earnings because the investor intends to sell the security or more likely than not will be required to sell the security before recovery of its amortized cost basis; (e) additional increases to the amount related to the credit loss for which an OTTI was previously recognized when the investor does not intend to sell the security and it is not more likely than not that the investor will be required to sell the security before recovery of its amortized cost basis; (f) reductions for increases in cash flows expected to be collected that are recognized over the remaining life of the security; and (g) the ending balance of the amount related to credit losses on debt securities held by the entity at the end of the period for which a portion of an OTTI was recognized in other comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27340-111563 + Details
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- Definition Tabular disclosure of the reconciliation of available-for-sale securities from cost basis to fair value. + References No definition available. + Details
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