Income Taxes (Summary of Loss Attributes, Section 382 Limitations, and Tax Expiration Periods) (Details) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating Loss Carryforwards [Line Items]
Income Tax Expense (Benefit)	$ 5,200	$ 11,312	$ 12,434	$ 12,955	$ 61,234	$ 10,253	$ 23,036	$ 12,257	$ 18,969	$ 2,848	$ 10,532	$ 9,757	$ 41,901	$ 106,780	$ 42,106
Realized Built-in Losses	70,253												70,253
Less amounts not recorded due to Sec 382 Limitation	(2,023)												(2,023)
Valuation Allowance	(1,467)												(1,467)
Federal
Operating Loss Carryforwards [Line Items]
Gross Federal Net Operating Losses	55,231												55,231
Gross Capital Losses
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforwards	6,987												6,987
Business Tax Credits
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforwards	2,432												2,432
Alternative Minimum Tax Credits - no expiration
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforwards	2,524												2,524
Monarch
Operating Loss Carryforwards [Line Items]
Estimated recognized built in gain	1,600												1,600
Subject to limitations under section 382 | Monarch
Operating Loss Carryforwards [Line Items]
Annual Section 382 limitation-base	673												673
Realized Built-in Losses	0												0
Less amounts not recorded due to Sec 382 Limitation	(1,738)												(1,738)
Valuation Allowance	0												0
Subject to limitations under section 382 | Monarch | Federal
Operating Loss Carryforwards [Line Items]
Gross Federal Net Operating Losses	12,350												12,350
Subject to limitations under section 382 | Monarch | Gross Capital Losses
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforwards	0												0
Subject to limitations under section 382 | Monarch | Business Tax Credits
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforwards	1,651												1,651
Subject to limitations under section 382 | Monarch | Alternative Minimum Tax Credits - no expiration
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforwards	106												106
Subject to limitations under section 382 | First Place Holdings/First Place Bank
Operating Loss Carryforwards [Line Items]
Income Tax Expense (Benefit)													0
Annual Section 382 limitation-base	6,650												6,650
Realized Built-in Losses	61,317												61,317
Less amounts not recorded due to Sec 382 Limitation	(140)												(140)
Valuation Allowance	0												0
Subject to limitations under section 382 | First Place Holdings/First Place Bank | Federal
Operating Loss Carryforwards [Line Items]
Gross Federal Net Operating Losses	0												0
Subject to limitations under section 382 | First Place Holdings/First Place Bank | Gross Capital Losses
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforwards	0												0
Subject to limitations under section 382 | First Place Holdings/First Place Bank | Business Tax Credits
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforwards	781												781
Subject to limitations under section 382 | First Place Holdings/First Place Bank | Alternative Minimum Tax Credits - no expiration
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforwards	2,115												2,115
Subject to limitations under section 382 | Talmer West Bank
Operating Loss Carryforwards [Line Items]
Annual Section 382 limitation-base	3,028												3,028
Realized Built-in Losses	8,936												8,936
Less amounts not recorded due to Sec 382 Limitation	0												0
Valuation Allowance	0												0
Subject to limitations under section 382 | Talmer West Bank | Federal
Operating Loss Carryforwards [Line Items]
Gross Federal Net Operating Losses	41,039												41,039
Subject to limitations under section 382 | Talmer West Bank | Gross Capital Losses
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforwards	0												0
Subject to limitations under section 382 | Talmer West Bank | Business Tax Credits
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforwards	0												0
Subject to limitations under section 382 | Talmer West Bank | Alternative Minimum Tax Credits - no expiration
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforwards	0												0
Subject to limitations under section 382 | First of Huron Corp./Signature Bank
Operating Loss Carryforwards [Line Items]
Annual Section 382 limitation-base	365												365
Realized Built-in Losses	0												0
Less amounts not recorded due to Sec 382 Limitation	0												0
Valuation Allowance	0												0
Subject to limitations under section 382 | First of Huron Corp./Signature Bank | Federal
Operating Loss Carryforwards [Line Items]
Gross Federal Net Operating Losses	247												247
Subject to limitations under section 382 | First of Huron Corp./Signature Bank | Gross Capital Losses
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforwards	0												0
Subject to limitations under section 382 | First of Huron Corp./Signature Bank | Business Tax Credits
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforwards	0												0
Subject to limitations under section 382 | First of Huron Corp./Signature Bank | Alternative Minimum Tax Credits - no expiration
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforwards	303												303
Subject to limitations under section 382 | From 2009 Ownership change
Operating Loss Carryforwards [Line Items]
Annual Section 382 limitation-base	145												145
Realized Built-in Losses	0												0
Less amounts not recorded due to Sec 382 Limitation	(145)												(145)
Valuation Allowance	0												0
Subject to limitations under section 382 | From 2009 Ownership change | Federal
Operating Loss Carryforwards [Line Items]
Gross Federal Net Operating Losses	1,595												1,595
Subject to limitations under section 382 | From 2009 Ownership change | Gross Capital Losses
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforwards	0												0
Subject to limitations under section 382 | From 2009 Ownership change | Business Tax Credits
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforwards	0												0
Subject to limitations under section 382 | From 2009 Ownership change | Alternative Minimum Tax Credits - no expiration
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforwards	0												0
Not subject to limitations under section 382
Operating Loss Carryforwards [Line Items]
Realized Built-in Losses	0												0
Less amounts not recorded due to Sec 382 Limitation	0												0
Valuation Allowance	(1,467)												(1,467)
Not subject to limitations under section 382 | Federal
Operating Loss Carryforwards [Line Items]
Annual Section 382 limitation-base	0												0
Gross Federal Net Operating Losses	0												0
Not subject to limitations under section 382 | Gross Capital Losses
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforwards	6,987												6,987
Not subject to limitations under section 382 | Business Tax Credits
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforwards	0												0
Not subject to limitations under section 382 | Alternative Minimum Tax Credits - no expiration
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforwards	$ 0												$ 0