Income Taxes (Textuals) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Aug. 31, 2016	Dec. 31, 2014
Operating Loss Carryforwards [Line Items]
Tax at statutory rate	35.00%	35.00%	35.00%
Impact of Tax Cuts and Jobs Act	$ 46,660,000	$ 0	$ 0
Impact of Tax Cuts and Jobs Act, revaluation of deferred tax asset	46,000,000
Impact of Tax Cuts and Jobs Act, accelerated amortization	700,000
Net deferred tax assets acquired	151,900,000
Realized Built-in Losses	77,292,000
Valuation allowance for deferred tax assets	1,150,000	2,239,000
Bad debt reserve	91,887,000	78,268,000	$ 73,328,000		$ 75,683,000
Unrecognized tax benefits	0	0
Liabilities accrued for interest or penalties	0	$ 0
Federal
Operating Loss Carryforwards [Line Items]
Gross Federal Net Operating Losses	64,720,000
Alternative Minimum Tax Credits - no expiration
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards	25,829,000
Talmer
Operating Loss Carryforwards [Line Items]
Realized Built-in Losses				$ 88,700,000
Valuation allowance for deferred tax assets	1,200,000
Valuation allowance for tax credit carryforward	600,000
Talmer | Federal
Operating Loss Carryforwards [Line Items]
Gross Federal Net Operating Losses				102,800,000
Tax credit carryforwards				1,000,000
Talmer | Subject to limitations under section 382
Operating Loss Carryforwards [Line Items]
Realized Built-in Losses	0
Valuation allowance for deferred tax assets	600,000
Talmer | Subject to limitations under section 382 | Federal
Operating Loss Carryforwards [Line Items]
Gross Federal Net Operating Losses	0
Talmer | Alternative Minimum Tax Credits - no expiration
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards				$ 14,900,000
Talmer | Alternative Minimum Tax Credits - no expiration | Subject to limitations under section 382
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards	12,473,000
First Place Holdings/First Place Bank | Subject to limitations under section 382
Operating Loss Carryforwards [Line Items]
Realized Built-in Losses	68,356,000
Bad debt reserve	36,000,000
Potential unrecognized tax expense that would impact effective tax rate	7,500,000
First Place Holdings/First Place Bank | Subject to limitations under section 382 | Federal
Operating Loss Carryforwards [Line Items]
Gross Federal Net Operating Losses	0
First Place Holdings/First Place Bank | Alternative Minimum Tax Credits - no expiration | Subject to limitations under section 382
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards	2,115,000
Talmer West Bank | Subject to limitations under section 382
Operating Loss Carryforwards [Line Items]
Realized Built-in Losses	8,936,000
Talmer West Bank | Subject to limitations under section 382 | Federal
Operating Loss Carryforwards [Line Items]
Gross Federal Net Operating Losses	47,284,000
Talmer West Bank | Alternative Minimum Tax Credits - no expiration | Subject to limitations under section 382
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards	$ 0