Employee Benefit Plans - Pension Plan Assets Measured and Recorded at Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 10,159	$ 9,331	$ 9,368
Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	10,159	9,331
Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Money markets
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	720	870
Money markets | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	720	870
Money markets | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Money markets | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Mutual funds - debt
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,368	3,247
Mutual funds - debt | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,368	3,247
Mutual funds - debt | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Mutual funds - debt | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Mutual funds - equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5,221	4,458
Mutual funds - equity | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5,221	4,458
Mutual funds - equity | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Mutual funds - equity | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Emclaire Financial Corp stock
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	850	756
Emclaire Financial Corp stock | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	850	756
Emclaire Financial Corp stock | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Emclaire Financial Corp stock | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 0	$ 0