FDIC Indemnification Asset (Schedule of FDIC Indemnification Asset Components) (Details)	3 Months Ended
	Jun. 30, 2015 USD ($)	Sep. 30, 2015 USD ($)	Dec. 31, 2014 USD ($) item	Sep. 30, 2014 USD ($)
FDIC indemnification asset components
Receivable (payable) related to loss claims incurred, (recoveries), not yet reimbursed, net		$ (2,427,000)	$ 6,899,000	$ 5,957,000
Receivable related to estimated future claims on loans		9,522,000	14,933,000	17,932,000
Receivable related to estimated future claims on foreclosed real estate		554,000	737,000	1,439,000
FDIC indemnification asset		$ 7,649,000	22,569,000	$ 25,328,000
Receivable related to claims involving the same borrower for which the FDIC has denied the claims			$ 1,200,000
Number of claims involving the same borrower for which the FDIC has denied the claims | item			2
Amount of claims to be fully honored by the FDIC and the related loan	$ 324,000
Ratio of claims amount to be split on future recoveries realized prior to June 30, 2017	20.00%
Percentage of receivable related to estimated future claims received by FDIC	80.00%
Amount of other claim	$ 886,000
Receivable from FDIC	$ 480,000
Percentage of receivable related to estimated future claims on loans	100.00%
Wrote off the portion of the claim not being reimbursed by the FDIC	$ 406,000