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Borrowed Funds (Tables) | 12 Months Ended
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Dec. 31, 2019
Debt Disclosure [Abstract] |
Summary of borrowed funds | Borrowed funds consist of the following obligations at December 31:
| 2019 |  | 2018
| Amount |  | Rate |  | Amount |  | Rate
FHLB advances | $ | 245,000 |  |  | 2.32 | % |  | $ | 300,000 |  |  | 2.20 | %
Securities sold under agreements to repurchase without stated maturity dates | 30,999 |  |  | 0.09 | % |  | 40,299 |  |  | 0.11 | %
Total | $ | 275,999 |  |  | 2.07 | % |  | $ | 340,299 |  |  | 1.95 | %
Federal home loan bank, advances | The following table lists the maturities and weighted average interest rates of FHLB advances as of December 31:
| 2019 |  | 2018
| Amount |  | Rate |  | Amount |  | Rate
Fixed rate due 2019 | $ | — |  |  | — | % |  | $ | 100,000 |  |  | 1.94 | %
Fixed rate due 2020 | 55,000 |  |  | 2.18 | % |  | 55,000 |  |  | 2.18 | %
Fixed rate due 2021 | 50,000 |  |  | 1.91 | % |  | 50,000 |  |  | 1.91 | %
Variable rate due 2021 (1) | 10,000 |  |  | 2.20 | % |  | 10,000 |  |  | 2.93 | %
Fixed rate due 2022 | 20,000 |  |  | 1.97 | % |  | 20,000 |  |  | 1.97 | %
Fixed rate due 2023 | 45,000 |  |  | 2.97 | % |  | 35,000 |  |  | 3.17 | %
Fixed rate due 2024 | 55,000 |  |  | 2.68 | % |  | 20,000 |  |  | 2.96 | %
Fixed rate due 2026 | 10,000 |  |  | 1.17 | % |  | 10,000 |  |  | 1.17 | %
Total | $ | 245,000 |  |  | 2.32 | % |  | $ | 300,000 |  |  | 2.20 | %
(1) Hedged advance (see “Derivative Instruments” section below)
Summary of short term borrowings | We had no FRB Discount Window advances for the years ended December 31, 2019 and 2018. The following table provides a summary of securities sold under repurchase agreements without stated maturity dates and federal funds purchased at December 31:
| 2019 |  | 2018
| 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 | $ | 37,441 |  |  | $ | 31,406 |  |  | 0.10 | % |  | $ | 63,133 |  |  | $ | 38,036 |  |  | 0.10 | %
Federal funds purchased | 7,070 |  |  | 687 |  |  | 2.60 | % |  | 16,200 |  |  | 3,741 |  |  | 1.90 | %
Summary of pledged financial instruments | We had pledged AFS securities and 1-4 family residential real estate loans in the following amounts at December 31:
| 2019 |  | 2018
Pledged to secure borrowed funds | $ | 368,310 |  |  | $ | 431,430 |
Pledged to secure repurchase agreements | 31,020 |  |  | 40,316 |
Pledged for public deposits and for other purposes necessary or required by law | 59,537 |  |  | 58,107 |
Total | $ | 458,867 |  |  | $ | 529,853 |
AFS securities pledged to repurchase agreements without stated maturity dates consisted of the following at December 31:
| 2019 |  | 2018
States and political subdivisions | $ | 31,020 |  |  | $ | 23,268 |
Mortgage-backed securities | — |  |  | 10,736 |
Collateralized mortgage obligations | — |  |  | 6,312 |
Total | $ | 31,020 |  |  | $ | 40,316 |
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] | The following tables provide information on derivatives related to variable rate borrowings as of December 31:
| 2019
| 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 |  | 1.3 |  | $ | 10,000 |  |  | Other Assets |  | $ | 67 |
| 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 |  | 2.3 |  | $ | 10,000 |  |  | Other Assets |  | $ | 323 |

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