Loan Servicing Rights (LSRs Activity) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($)
Activity for loan servicing rights and the related fair value changes
Fair value, beginning of period	$ 0
Acquired in Talmer Bancorp, Inc. merger	42,462
Additions from loans sold with servicing retained	1,030
Changes in fair value due to reductions from pay downs	(519)
Changes in estimates of fair value	5,112
Fair value, end of period	48,085
Principal balance of loans serviced for others that have servicing capitalized	5,300,171
Commercial real estate
Activity for loan servicing rights and the related fair value changes
Fair value, beginning of period	0
Acquired in Talmer Bancorp, Inc. merger	365
Additions from loans sold with servicing retained	0
Changes in fair value due to reductions from pay downs	(17)
Changes in estimates of fair value	(4)
Fair value, end of period	344
Principal balance of loans serviced for others that have servicing capitalized	64,756
Residential mortgage
Activity for loan servicing rights and the related fair value changes
Fair value, beginning of period	0
Acquired in Talmer Bancorp, Inc. merger	42,097
Additions from loans sold with servicing retained	1,030
Changes in fair value due to reductions from pay downs	(502)
Changes in estimates of fair value	5,116
Fair value, end of period	47,741
Principal balance of loans serviced for others that have servicing capitalized	$ 5,235,415