Significant Accounting Policies (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Changes in the FDIC loss-share indemnification asset
Balance at January 1	$ 7,149,000	$ 12,516,000
Additions through acquisition	(260,000)	2,673,000
Realized losses in excess of initial estimates on:
Loans	265,000	872,000
OREO	97,000	362,000
Reimbursable expenses	0	1,170,000
Amortization	(797,000)	(4,865,000)
Reimbursements received from the FDIC	(2,987,000)	(5,579,000)
Termination of FDIC loss share agreements	(3,467,000)	0
Balance at December 31	$ 0	$ 7,149,000