Income Taxes (Details 2) - USD ($)	Dec. 31, 2016	Dec. 31, 2015
Deferred tax assets
Allowance for loan losses	$ 19,934,000	$ 17,430,000
Loans	23,240,000	26,239,000
Deferred compensation	11,254,000	17,060,000
Net unrealized losses on securities	10,096,000	6,065,000
Impairment of assets	2,512,000	3,271,000
Net operating loss carryforwards	2,867,000	3,681,000
Other	7,149,000	7,499,000
Gross deferred tax assets	77,052,000	81,245,000
Valuation allowance on state net operating loss carryforwards	0	0
Total deferred tax assets	77,052,000	81,245,000
Deferred tax liabilities
FDIC indemnification asset	0	1,927,000
Investment in partnerships	1,556,000	2,507,000
Core deposit intangible	0	3,386,000
Depreciation	2,517,000	673,000
Mortgage servicing rights	3,360,000	4,032,000
Subordinated debt	4,111,000	4,287,000
Other	2,876,000	2,364,000
Total deferred tax liabilities	14,420,000	19,176,000
Net deferred tax assets	$ 62,632,000	$ 62,069,000