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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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