Fair Value Measurements - (Details Textual) - USD ($)	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Fair Value Measurements (Textual) [Abstract]
Impaired loans not covered under loss-share agreements	$ 9,908,000		$ 7,191,000
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Specific reserve included in allowance for loan losses	45,924,000		42,437,000
Impairment losses on mortgage servicing rights	40,000	$ 0
Changes in fair value, gain (loss)	(145,000)	$ 1,023,000
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	$ 2,721,000		$ 683,000