Other Real Estate Owned (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Real Estate Properties [Line Items]
Financing Receivable in Consumer Mortgage Loans, Collateralized by Residential Real Estate in Process of Foreclosure	$ 20,100,000			$ 24,800,000
Covered
Beginning balance	22,982,000	47,081,000	17,302,000		41,855,000
Additions	4,244,000	1,514,000
Sales	(8,970,000)	(4,512,000)
Writedowns	(954,000)	(2,228,000)
Noncovered
Beginning balance	70,454,000	36,898,000	72,690,000		44,504,000
Additions	17,084,000	3,318,000
Sales	(13,573,000)	(5,854,000)
Writedowns	(1,275,000)	(1,449,000)
Total
Beginning balance	93,436,000	83,979,000
Additions	21,328,000	4,832,000
Sales	(22,543,000)	(10,366,000)
Writedowns	(2,229,000)	(3,677,000)
Ending balance	89,992,000	86,359,000
Mortgage
Total
Beginning balance			23,236,000	29,048,000
Ending balance	23,236,000		23,236,000	29,048,000
1st Financial
Covered
Additions		0
Noncovered
Additions		11,591,000
Total
Additions		$ 11,591,000