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Borrowings and Borrowings Availability (Schedule of debt) (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Total borrowings / weighted average rate as of December 31, 2018 | $ 409,550,000 | $ 410,665,000
Unamortized discount on acquired borrowings | (2,941,000) | (3,122,000)
Total borrowings | $ 406,609,000 | $ 407,543,000
Weighted average interest rate | 2.68% | 1.72%
Federal Home Loan Bank Term Note One [Member] |  |
Maturity date | Jan. 10, 2019 | Jan. 05, 2018
Total borrowings | $ 68,000,000 | $ 135,000,000
Weighted average interest rate | 2.47% | 1.36%
Federal Home Loan Bank Term Note Two [Member] |  |
Maturity date | Jan. 17, 2019 | Jan. 29, 2018
Total borrowings | $ 135,000,000 | $ 68,000,000
Weighted average interest rate | 2.49% | 1.41%
Federal Home Loan Bank Term Note Three [Member] |  |
Maturity date | Jan. 24, 2019 | Apr. 18, 2018
Total borrowings | $ 20,000,000 | $ 50,000,000
Weighted average interest rate | 2.54% | 1.25%
Federal Home Loan Bank Term Note Four [Member] |  |
Maturity date | Jan. 31, 2019 | Jun. 26, 2018
Total borrowings | $ 20,000,000 | $ 20,000,000
Weighted average interest rate | 2.53% | 1.67%
Federal Home Loan Bank Term Note Five [Member] |  |
Maturity date | Jan. 31, 2019 | Sep. 28, 2018
Total borrowings | $ 10,000,000 | $ 10,000,000
Weighted average interest rate | 2.53% | 1.52%
Federal Home Loan Bank Term Note Six [Member] |  |
Maturity date | Apr. 18, 2019 | Dec. 24, 2018
Total borrowings | $ 50,000,000 | $ 20,000,000
Weighted average interest rate | 2.36% | 1.57%
Federal Home Loan Bank Term Note Seven [Member] |  |
Maturity date | May 29, 2020 | May 29, 2020
Total borrowings | $ 40,000,000 | $ 40,000,000
Weighted average interest rate | 1.62% | 1.62%
Federal Home Loan Bank Principal Reducing Credit One [Member] |  |
Maturity date | Jul. 24, 2023 | Jul. 24, 2023
Total borrowings | $ 210,000 | $ 250,000
Weighted average interest rate | 1.00% | 1.00%
Federal Home Loan Bank Principal Reducing Credit Two [Member] |  |
Maturity date | Dec. 22, 2023 | Dec. 22, 2023
Total borrowings | $ 1,065,000 | $ 1,100,000
Weighted average interest rate | 1.25% | 1.25%
Federal Home Loan Bank Principal Reducing Credit Three [Member] |  |
Maturity date | Jan. 15, 2026 | Jan. 15, 2026
Total borrowings | $ 7,500,000 | $ 8,500,000
Weighted average interest rate | 1.98% | 1.98%
Federal Home Loan Bank Principal Reducing Credit Four [Member] |  |
Maturity date | Jun. 26, 2028 | Jun. 26, 2028
Total borrowings | $ 255,000 | $ 264,000
Weighted average interest rate | 0.25% | 0.25%
Federal Home Loan Bank Principal Reducing Credit Five [Member] |  |
Maturity date | Jul. 17, 2028 | Jul. 17, 2028
Total borrowings | $ 61,000 | $ 66,000
Weighted average interest rate | 0.00% | 0.00%
Federal Home Loan Bank Principal Reducing Credit Six [Member] |  |
Maturity date | Aug. 18, 2028 | Aug. 18, 2028
Total borrowings | $ 188,000 | $ 195,000
Weighted average interest rate | 1.00% | 1.00%
Federal Home Loan Bank Principal Reducing Credit Seven [Member] |  |
Maturity date | Aug. 22, 2028 | Aug. 22, 2028
Total borrowings | $ 188,000 | $ 195,000
Weighted average interest rate | 1.00% | 1.00%
Federal Home Loan Bank Principal Reducing Credit Eight [Member] |  |
Maturity date | Dec. 20, 2028 | Dec. 20, 2028
Total borrowings | $ 376,000 | $ 391,000
Weighted average interest rate | 0.50% | 1.50%
Trust Preferred Securities 1 [Member] |  |
Maturity date | Jan. 23, 2034 | Jan. 23, 2034
Total borrowings | $ 20,620,000 | $ 20,620,000
Weighted average interest rate | 5.22% | 4.08%
Variable rate description | 5.22% at 12/31/2018 adjustable rate 3 month LIBOR + 2.70% | 4.08% at 12/31/2017 adjustable rate 3 month LIBOR + 2.70%
Trust Preferred Securities 2 [Member] |  |
Maturity date | Jun. 15, 2036 | Jun. 15, 2036
Total borrowings | $ 25,774,000 | $ 25,774,000
Weighted average interest rate | 4.18% | 2.98%
Variable rate description | 4.18% at 12/31/2018 adjustable rate 3 month LIBOR + 1.39% | 2.98% at 12/31/2017 adjustable rate 3 month LIBOR + 1.39%
Trust Preferred Securities 3 [Member] |  |
Maturity date | Jan. 07, 2035 | Jan. 07, 2035
Total borrowings | $ 10,310,000 | $ 10,310,000
Weighted average interest rate | 4.44% | 3.36%
Variable rate description | 4.44% at 12/31/2018 adjustable rate 3 month LIBOR + 2.00% | 3.36% at 12/31/2017 adjustable rate 3 month LIBOR + 2.00%

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