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Borrowed Funds (Tables)
12 Months Ended
Dec. 31, 2018
Debt Disclosure [Abstract]  
Summary of borrowed funds
Borrowed funds consist of the following obligations at December 31:
 
2018
 
2017

Amount
 
Rate
 
Amount
 
Rate
FHLB advances
$
300,000

 
2.20
%
 
$
290,000

 
1.94
%
Securities sold under agreements to repurchase without stated maturity dates
40,299

 
0.11
%
 
54,878

 
0.12
%
Total
$
340,299

 
1.95
%
 
$
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 December 31:
 
2018
 
2017

Amount
 
Rate
 
Amount
 
Rate
Fixed rate due 2018
$

 
%
 
$
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

 
2.93
%
 
10,000

 
1.72
%
Fixed rate due 2022
20,000

 
1.97
%
 
20,000

 
1.97
%
Fixed rate due 2023
35,000

 
3.17
%
 
10,000

 
3.90
%
Fixed rate due 2024
20,000

 
2.96
%
 

 
%
Fixed rate due 2026
10,000

 
1.17
%
 
10,000

 
1.17
%
Total
$
300,000

 
2.20
%
 
$
290,000

 
1.94
%
(1) Hedged advance (see "Derivative Instruments" section below)
Summary of short term borrowings
The following tables provide a summary of securities sold under repurchase agreements without stated maturity dates, federal funds purchased, and FRB Discount advances at December 31:
 
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
$
63,133

 
$
38,036

 
0.10
%
 
$
58,464

 
$
55,206

 
0.13
%
Federal funds purchased
16,200

 
3,741

 
1.78
%
 
5,965

 
2,726

 
1.15
%
FRB Discount Window

 

 
%
 

 
43

 
1.54
%
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:

2018
 
2017
Pledged to secure borrowed funds
$
431,430

 
$
410,988

Pledged to secure repurchase agreements
40,316

 
54,898

Pledged for public deposits and for other purposes necessary or required by law
58,107

 
27,976

Total
$
529,853

 
$
493,862


AFS securities pledged to repurchase agreements without stated maturity dates consisted of the following at December 31:

2018
 
2017
States and political subdivisions
$
23,268

 
$
7,332

Mortgage-backed securities
10,736

 
13,199

Collateralized mortgage obligations
6,312

 
34,367

Total
$
40,316

 
$
54,898

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:
 
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

 
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