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Borrowings and Borrowings Availability (Schedule of debt) (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Total borrowings / weighted average rate as of December 31, 2017 | $ 410,665,000 |
Unamortized discount on acquired borrowings | (3,122,000) |
Total borrowings | $ 407,543,000 | $ 271,394,000
Weighted average interest rate | 1.72% | 1.16%
Federal Home Loan Bank Term Note One [Member] |  |
Maturity date | Jan. 05, 2018 | Jan. 27, 2017
Total borrowings | $ 135,000,000 | $ 20,000,000
Weighted average interest rate | 1.36% | 0.61%
Federal Home Loan Bank Term Note Two [Member] |  |
Maturity date | Jan. 29, 2018 | Jan. 30, 2017
Total borrowings | $ 68,000,000 | $ 80,000,000
Weighted average interest rate | 1.41% | 0.63%
Federal Home Loan Bank Term Note Three [Member] |  |
Maturity date | Apr. 18, 2018 | Apr. 18, 2017
Total borrowings | $ 50,000,000 | $ 50,000,000
Weighted average interest rate | 1.25% | 0.70%
Federal Home Loan Bank Term Note Four [Member] |  |
Maturity date | Jun. 26, 2018 | Dec. 26, 2017
Total borrowings | $ 20,000,000 | $ 20,000,000
Weighted average interest rate | 1.67% | 1.19%
Federal Home Loan Bank Term Note Five [Member] |  |
Maturity date | Sep. 28, 2018 | Dec. 29, 2017
Total borrowings | $ 10,000,000 | $ 35,000,000
Weighted average interest rate | 1.52% | 0.80%
Federal Home Loan Bank Term Note Six [Member] |  |
Maturity date | Dec. 24, 2018 | Dec. 24, 2018
Total borrowings | $ 20,000,000 | $ 20,000,000
Weighted average interest rate | 1.57% | 1.57%
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 | 4.08% | 3.59%
Variable rate description | 4.08% at 12/31/2017 adjustable rate 3 month LIBOR + 2.70% | 3.59% at 12/31/16 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 | 2.98% | 2.35%
Variable rate description | 2.98% at 12/31/2017 adjustable rate 3 month LIBOR + 1.39% | 2.35% at 12/31/16 adjustable rate 3 month LIBOR + 1.39%
Federal Home Loan Bank Term Note Seven [Member] |  |
Maturity date | May 29, 2020 |
Total borrowings | $ 40,000,000 |
Weighted average interest rate | 1.62% |
Federal Home Loan Bank Principal Reducing Credit One [Member] |  |
Maturity date | Jul. 24, 2023 |
Total borrowings | $ 250,000 |
Weighted average interest rate | 1.00% |
Federal Home Loan Bank Principal Reducing Credit Two [Member] |  |
Maturity date | Dec. 22, 2023 |
Total borrowings | $ 1,100,000 |
Weighted average interest rate | 1.25% |
Federal Home Loan Bank Principal Reducing Credit Three [Member] |  |
Maturity date | Jan. 15, 2026 |
Total borrowings | $ 8,500,000 |
Weighted average interest rate | 1.98% |
Federal Home Loan Bank Principal Reducing Credit Four [Member] |  |
Maturity date | Jun. 26, 2028 |
Total borrowings | $ 264,000 |
Weighted average interest rate | 0.25% |
Federal Home Loan Bank Principal Reducing Credit Five [Member] |  |
Maturity date | Jul. 17, 2028 |
Total borrowings | $ 66,000 |
Weighted average interest rate | 0.00% |
Federal Home Loan Bank Principal Reducing Credit Six [Member] |  |
Maturity date | Aug. 18, 2028 |
Total borrowings | $ 195,000 |
Weighted average interest rate | 1.00% |
Federal Home Loan Bank Principal Reducing Credit Seven [Member] |  |
Maturity date | Aug. 22, 2028 |
Total borrowings | $ 195,000 |
Weighted average interest rate | 1.00% |
Federal Home Loan Bank Principal Reducing Credit Eight [Member] |  |
Maturity date | Dec. 20, 2028 |
Total borrowings | $ 391,000 |
Weighted average interest rate | 1.50% |
Trust Preferred Securities 3 [Member] |  |
Maturity date | Jan. 07, 2035 |
Total borrowings | $ 10,310,000 |
Weighted average interest rate | 3.36% |
Variable rate description | 3.36% at 12/31/2017 adjustable rate 3 month LIBOR + 2.00% |

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