Basis of Presentation and Significant Accounting Policies (Details) $ in Thousands		3 Months Ended
		Mar. 31, 2019 Bank	Dec. 31, 2017 USD ($)
Accounting Policies [Abstract]
Number of banks through which company operates (in bank) | Bank		1
Number of regional banking units Chemical Bank operates through (in bank) | Bank		6
Business Acquisition
Cumulative effect adjustment of change in accounting policy, net of tax impact | $	[1]		$ 1,339
Retained earnings
Business Acquisition
Cumulative effect adjustment of change in accounting policy, net of tax impact | $	[1]		$ 1,680

[1] Refer to Note 1, Basis of Presentation and Significant Accounting Policies, Note 6, Other Real Estate Owned and Repossessed Assets and Note 20, Accumulated Other Comprehensive Loss for further details on changes in accounting policy.