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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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