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Borrowed Funds (Tables) | 6 Months Ended
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Jun. 30, 2018
Debt Disclosure [Abstract] |
Summary of borrowed funds | Borrowed funds consist of the following obligations as of:
| June 30, 2018 |  | December 31, 2017
| Amount |  | Rate |  | Amount |  | Rate
FHLB advances | $ | 315,000 |  |  | 2.09 | % |  | $ | 290,000 |  |  | 1.94 | %
Securities sold under agreements to repurchase without stated maturity dates | 31,296 |  |  | 0.10 | % |  | 54,878 |  |  | 0.12 | %
Federal funds purchased | 16,200 |  |  | 2.14 | % |  | — |  |  | — | %
Total | $ | 362,496 |  |  | 1.92 | % |  | $ | 344,878 |  |  | 1.65 | %
Federal Home Loan Bank, Advances | The following table lists the maturities and weighted average interest rates of FHLB advances as of:
| June 30, 2018 |  | December 31, 2017
| Amount |  | Rate |  | Amount |  | Rate
Fixed rate due 2018 | $ | 40,000 |  |  | 1.90 | % |  | $ | 70,000 |  |  | 1.96 | %
Fixed rate due 2019 | 100,000 |  |  | 1.94 | % |  | 85,000 |  |  | 1.87 | %
Fixed rate due 2020 | 55,000 |  |  | 2.18 | % |  | 35,000 |  |  | 1.80 | %
Fixed rate due 2021 | 50,000 |  |  | 1.91 | % |  | 50,000 |  |  | 1.91 | %
Variable rate due 2021 1 | 10,000 |  |  | 2.63 | % |  | 10,000 |  |  | 1.72 | %
Fixed rate due 2022 | 20,000 |  |  | 1.97 | % |  | 20,000 |  |  | 1.97 | %
Fixed rate due 2023 | 20,000 |  |  | 3.36 | % |  | 10,000 |  |  | 3.90 | %
Fixed rate due 2024 | 10,000 |  |  | 2.97 | % |  | — |  |  | — | %
Fixed rate due 2026 | 10,000 |  |  | 1.17 | % |  | 10,000 |  |  | 1.17 | %
Total | $ | 315,000 |  |  | 2.09 | % |  | $ | 290,000 |  |  | 1.94 | %
(1) | Hedged advance (see "Derivative Instruments" section below)
Summary of short term borrowings | The following table provides a summary of securities sold under repurchase agreements without stated maturity dates and federal funds purchased. We had no FRB Discount Window advances during the three and six month periods ended June 30, 2018.
| Three Months Ended June 30
| 2018 |  | 2017
| Maximum Month End Balance |  | Average Balance |  | Weighted Average Interest Rate During the Period |  | Maximum Month End Balance |  | Average Balance |  | Weighted Average Interest Rate During the Period
Securities sold under agreements to repurchase without stated maturity dates | $ | 34,242 |  |  | $ | 32,957 |  |  | 0.09 | % |  | $ | 55,731 |  |  | $ | 53,841 |  |  | 0.13 | %
Federal funds purchased | 16,200 |  |  | 9,199 |  |  | 1.82 | % |  | 5,965 |  |  | 7,496 |  |  | 1.13 | %
FRB Discount Window | — |  |  | — |  |  | — | % |  | — |  |  | 88 |  |  | 1.48 | %
| Six Months Ended June 30
| 2018 |  | 2017
| Maximum Month End Balance |  | Average Balance |  | Weighted Average Interest Rate During the Period |  | Maximum Month End Balance |  | Average Balance |  | Weighted Average Interest Rate During the Period
Securities sold under agreements to repurchase without stated maturity dates | $ | 38,967 |  |  | $ | 34,467 |  |  | 0.09 | % |  | $ | 61,131 |  |  | $ | 55,663 |  |  | 0.13 | %
Federal funds purchased | 16,200 |  |  | 6,843 |  |  | 1.77 | % |  | 27,300 |  |  | 4,197 |  |  | 1.11 | %
FRB Discount Window | — |  |  | — |  |  | — | % |  | — |  |  | 44 |  |  | 1.48 | %
Summary of pledged financial instruments | We had pledged AFS securities and 1-4 family residential real estate loans in the following amounts at:
| June 30 2018 |  | December 31 2017
Pledged to secure borrowed funds | $ | 423,968 |  |  | $ | 410,988 |
Pledged to secure repurchase agreements | 31,315 |  |  | 54,898 |
Pledged for public deposits and for other purposes necessary or required by law | 34,386 |  |  | 27,976 |
Total | $ | 489,669 |  |  | $ | 493,862 |
AFS securities pledged to repurchase agreements without stated maturity dates consisted of the following at:
| June 30 2018 |  | December 31 2017
States and political subdivisions | $ | 3,346 |  |  | $ | 7,332 |
Mortgage-backed securities | 6,537 |  |  | 13,199 |
Collateralized mortgage obligations | 21,432 |  |  | 34,367 |
Total | $ | 31,315 |  |  | $ | 54,898 |
Schedule of derivative instruments | The following tables provide information on derivatives related to variable rate borrowings as of:
| June 30, 2018
| Pay Rate |  | Receive Rate |  | Remaining Life (Years) |  | Notional Amount |  | Balance Sheet Location |  | Fair Value
Derivatives designated as hedging instruments |  |  |  |  |  |  |  |  |  |  |
Cash Flow Hedges: |  |  |  |  |  |  |  |  |  |  |
Interest rate swaps | 1.56 | % |  | 3-Month LIBOR |  | 2.7 |  | $ | 10,000 |  |  | Other Assets |  | $ | 444 |
| December 31, 2017
| Pay Rate |  | Receive Rate |  | Remaining Life (Years) |  | Notional Amount |  | Balance Sheet Location |  | Fair Value
Derivatives designated as hedging instruments |  |  |  |  |  |  |  |  |  |  |
Cash Flow Hedges: |  |  |  |  |  |  |  |  |  |  |
Interest rate swaps | 1.56 | % |  | 3-Month LIBOR |  | 3.3 |  | $ | 10,000 |  |  | Other Assets |  | $ | 291 |

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