Fair Value Measurements (Details Textual) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Gains (losses) related to assets or liabilities measured on a recurring basis using significant unobservable inputs		$ 0	$ 0
Impaired loans not covered under loss-share agreements		4,406,000	7,191,000
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Specific reserve included in allowance for loan losses		42,737,000	42,437,000
Net loss resulting from fair value changes of these mortgage loans		4,851,000
MSR impairment (recovery)	$ 0	40,000	0
FDIC loss share indemnification asset		0	7,149,000	$ 12,516,000
Impaired Loans, Not Covered
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Specific reserve included in allowance for loan losses		$ 305,000	$ 683,000