Intangible Assets (Textual) (Details) - USD ($)		3 Months Ended			9 Months Ended
	Aug. 31, 2016	Sep. 30, 2016	Mar. 31, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Goodwill acquired during period			$ 500,000
Amortization of intangible assets					$ 6,736,000	$ 9,405,000
Estimated Future Amortization Expense, Fiscal Year Maturity [Abstract]
Impairment valuation allowance		$ 200,000			200,000
Loan servicing fee income		2,100,000		$ 1,400,000	4,700,000	4,100,000
Core deposit intangible assets [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets		1,200,000		1,200,000	3,400,000	2,900,000
Estimated Future Amortization Expense, Fiscal Year Maturity [Abstract]
2016		1,400,000			1,400,000
2017		5,200,000			5,200,000
2018		5,000,000			5,000,000
2019		4,800,000			4,800,000
2020		4,200,000			4,200,000
2021 and thereafter		15,000,000			15,000,000
Impairment valuation allowance		0			0
Loan Servicing Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets		1,105,000		$ 1,070,000	3,055,000	$ 3,279,000
Estimated Future Amortization Expense, Fiscal Year Maturity [Abstract]
Impairment valuation allowance		$ 214,000			$ 214,000		$ 0
Talmer [Member]
Finite-Lived Intangible Assets [Line Items]
Goodwill acquired during period	$ 850,300,000