Loans and Asset Quality Information (Narrative) (Details) - USD ($)		9 Months Ended		12 Months Ended
	Jul. 02, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Total Covered Loans - Carrying Value		$ 106,609,000	$ 133,249,000	$ 127,594,000
Foreclosed real estate - covered		1,569,000	3,237,000	2,350,000
Nonaccrual loans		47,720,000		60,574,000
Accretion of loan discount		$ 3,897,000		16,009,000
Percentage of loan discount accretion		80.00%
Payments that exceeded the initial carrying amount on purchased impaired loans		$ 56,000	179,000
Contractual balance of nonaccrual loans		10,100,000	$ 16,300,000	16,000,000
Purchased Accruing Loans [Member]
Loan discount on loans		14,151,000
Purchased Nonaccruing Loans [Member]
Loan discount on loans		2,043,000
Covered Loss Sharing Subsequent Change to Noncovered [Member]
Total Covered Loans - Carrying Value	$ 39,700,000
Foreclosed real estate - covered	3,000,000
Nonaccrual loans	9,700,000
Restructured loans - accruing	2,100,000
Transfer of allowance of loan losses from covered to non-covered	1,700,000
Total loans transferred to non-covered status	$ 39,700,000
Residential mortgage loans [Member]
Total Covered Loans - Carrying Value		78,260,000		$ 89,770,000
Nonaccrual loans in process of foreclosure		$ 3,000,000