Borrowings (Details 1) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Securities sold under agreement to repurchase
Amounts outstanding at year-end	$ 9,321	$ 26,019
Gross amount of recognized liabilities for repurchase agreements	9,321	26,019
Mortgage Backed Securities, Other [Member]
Securities sold under agreement to repurchase
Amounts outstanding at year-end	3,645	6,599
Collateralized Mortgage Backed Securities [Member]
Securities sold under agreement to repurchase
Amounts outstanding at year-end	5,676	19,420
Maturity Overnight [Member]
Securities sold under agreement to repurchase
Amounts outstanding at year-end	9,321	26,019
Maturity Overnight [Member] | Mortgage Backed Securities, Other [Member]
Securities sold under agreement to repurchase
Amounts outstanding at year-end	3,645	6,599
Maturity Overnight [Member] | Collateralized Mortgage Backed Securities [Member]
Securities sold under agreement to repurchase
Amounts outstanding at year-end	5,676	19,420
Up to 30 [Member]
Securities sold under agreement to repurchase
Amounts outstanding at year-end	0	0
Up to 30 [Member] | Mortgage Backed Securities, Other [Member]
Securities sold under agreement to repurchase
Amounts outstanding at year-end	0	0
Up to 30 [Member] | Collateralized Mortgage Backed Securities [Member]
Securities sold under agreement to repurchase
Amounts outstanding at year-end	0	0
Maturity 30 to 90 Days [Member]
Securities sold under agreement to repurchase
Amounts outstanding at year-end	0	0
Maturity 30 to 90 Days [Member] | Mortgage Backed Securities, Other [Member]
Securities sold under agreement to repurchase
Amounts outstanding at year-end	0	0
Maturity 30 to 90 Days [Member] | Collateralized Mortgage Backed Securities [Member]
Securities sold under agreement to repurchase
Amounts outstanding at year-end	0	0
Maturity Greater than 90 Days [Member]
Securities sold under agreement to repurchase
Amounts outstanding at year-end	0	0
Maturity Greater than 90 Days [Member] | Mortgage Backed Securities, Other [Member]
Securities sold under agreement to repurchase
Amounts outstanding at year-end	0	0
Maturity Greater than 90 Days [Member] | Collateralized Mortgage Backed Securities [Member]
Securities sold under agreement to repurchase
Amounts outstanding at year-end	$ 0	$ 0